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This splinter meeting will bring together researchers working on the coupling processes within the MIPT system. The magnetosphere, ionosphere, plasmasphere, and thermosphere form an interconnected chain of regions whose dynamics fundamentally influence space weather conditions near Earth. Key processes, such as convection, field-aligned currents, particle precipitation, ion-neutral coupling, and plasmaspheric transport, all contribute to the system-level behavior that affects satellite operations, GNSS performance, and ground-based technological infrastructure. The rapid growth in available satellite observations, ground-based measurements, and advanced numerical models opens new opportunities for combined analysis, data assimilation techniques, and machine-learning approaches. However, the subsystems are still often investigated separately, despite the need for a system-level perspective. This meeting will provide a forum to discuss current challenges, identify priorities for collaborative research, and explore approaches for quantifying coupling and feedback mechanisms within the MIPT system. Participants are encouraged to share recent results, methodological developments, and ideas for international efforts aimed at improving the understanding and predictive capability of near-Earth space.

The Global Ecosystem Research Infrastructure (GERI) is composed of six large environmental research infrastructures: SAEON/South Africa, TERN/Australia, CERN/China, NEON/USA, ICOS/Europe, eLTER/Europe). With funding from a U.S. National Science Foundation AccelNet award, we have assembled a global network of early career researchers and worked to harmonize an initial suite of drought-related data across these environmental research infrastructures. Throughout this work, we have faced and overcome obstacles that we suspect are not unique to our project. This Splinter Meeting will provide an opportunity for GERI researchers to meet and discuss these challenges and lessons learned. We will present a brief review of previous work in these areas and discuss how our project and experiences compare. Our aim is to outline a manuscript detailing the challenges we faced and the lessons we learned, offering recommendations for future international collaborations. As part of this discussion, we will also review project logistics, outstanding data harmonization needs, and make a plan for completing this manuscript as a group. This Splinter Meeting will provide necessary in-person planning so that the GERI researchers can work together effectively over the summer to complete this challenges and lessons learned manuscript before project completion in September.

The Global Ecosystem Research Infrastructure (GERI) is composed of six large environmental research infrastructures: SAEON/South Africa, TERN/Australia, CERN/China, NEON/USA, ICOS/Europe, eLTER/Europe). With funding from a U.S. National Science Foundation AccelNet award, we have assembled a global network of early career researchers and worked to harmonize an initial suite of drought-related data across these environmental research infrastructures. Throughout this work, we have faced and overcome obstacles that we suspect are not unique to our project. This Splinter Meeting will provide an opportunity for GERI researchers to meet and discuss these challenges and lessons learned. We will present a brief review of previous work in these areas and discuss how our project and experiences compare. Our aim is to outline a manuscript detailing the challenges we faced and the lessons we learned, offering recommendations for future international collaborations. As part of this discussion, we will also review project logistics, outstanding data harmonization needs, and make a plan for completing this manuscript as a group. This Splinter Meeting will provide necessary in-person planning so that the GERI researchers can work together effectively over the summer to complete this challenges and lessons learned manuscript before project completion in September.

Follow-up of the Workshop "Vulnerability in Multi-Hazard Risks: Addressing Its Complexity and Dynamics," held in Munich on 12–13 November 2025. This is an invitation-only meeting, exclusively for workshop participants.

The Global Ecosystem Research Infrastructure (GERI) is composed of six large environmental research infrastructures: SAEON/South Africa, TERN/Australia, CERN/China, NEON/USA, ICOS/Europe, eLTER/Europe). With funding from a U.S. National Science Foundation AccelNet award, we have assembled a global network of early career researchers and worked to harmonize an initial suite of drought-related data across these environmental research infrastructures. Throughout this work, we have faced and overcome obstacles that we suspect are not unique to our project. This Splinter Meeting will provide an opportunity for GERI researchers to meet and discuss these challenges and lessons learned. We will present a brief review of previous work in these areas and discuss how our project and experiences compare. Our aim is to outline a manuscript detailing the challenges we faced and the lessons we learned, offering recommendations for future international collaborations. As part of this discussion, we will also review project logistics, outstanding data harmonization needs, and make a plan for completing this manuscript as a group. This Splinter Meeting will provide necessary in-person planning so that the GERI researchers can work together effectively over the summer to complete this challenges and lessons learned manuscript before project completion in September.

Updates from the Ice Sheet Model Intercomparison Project (ISMIP7) and community building.

Meeting of the Volcanology Section - Spanish Commission of Geodesy and Geophysics addressed to researchers of Spanish and Portuguese groups working on volcanology-related topics. The aim of this meeting is to carry on networking activities, look for joint initiatives and explore future collaborations.

IGMeeting is a meet-up for IGM developers, users, and anyone considering using IGM. We will give a quick round-up of recent progress in the code, present the plan for upcoming updates, and hear short highlights from current projects using IGM. We will then open the floor for discussion on user needs: changes users would like to see, missing features, and ideas for future collaborative projects. Current users and would-be users are all welcome.

The members of the IAG Commission.2 structure and any interested scientists are invited to join this meeting. We will review the events of last year, and discuss plans for the next.

GNSS chips embedded in smartphones are starting to widely support multi-frequency multi-GNSS carrier phase observation, thus providing a cost-effective solution to hazard monitoring. In this workshop, we intend to invite a few speakers to present the latest progress of smartphone based high-precision GNSS and its applications in earthquake, weather and structure deformation monitoring. Then a discussion will be started to talk about potential cooperation across nations. This workshop is inspired by a joint research project between National Science Foundation of China and National Science Centre of Poland. This project is named as the international bilateral Polish-Chinese Funding Initiative (https://www.ncn.gov.pl/en/wspolpraca-zagraniczna/wspolpraca-wielostronna/konkurs-sheng).

Policymakers need scientific information to help them make evidence-informed decisions. However, getting accurate, relevant, and useful scientific information to policymakers in a timely manner is challenging with people from a wide range of professions on the science-policy interface playing a role! In this Splinter Meeting, we’ll discuss a wide range of positions from researcher, to knowledge broker, science advisor, practitioner, and policy professional that support evidence-informed policymaking. A panel of experts working across the science-policy interface will share their career path, how they developed the necessary skills, and their tips for those who want to take the next step in their own career! Led by policy experts, this Splinter Meeting will not only provide participants with all the information that they need to provide evidence, but also with tips on how to frame evidence so that it is actually used!

In process-based hydrological modelling, far often than not its not the model run itself that dominates the workload: preprocessing (DEM handling using GIS, geometry discretisation, parameter set up) and post processing (model diagnostics, uncertainty analysis, reporting) usually take far more time and effort. This is because these steps involve many heterogeneous datasets and workflows that require consistent and defensible decision-making. In this splinter meeting session, we introduce the updated V-FOR-WaTer virtual research environment, with access to hydrological datasets and reproducible workflows for model pre- and post-processing. The list of currently available datasets include COPERNICUS 30m DEM, CAMELS-DE, HYRAS to name a few. The available prebuilt tool workflows include a GIS chain using WhiteboxGIS and evaluation tools for model diagnostics. This hands-on session (laptops are encouraged) is open to everyone interested in learning more about and applying the virtual research environment, exemplified for one process-based hydrological model. We look forward to some fruitful discussions and an exciting opportunity to meet everyone.

Women in Coastal Geoscience and Engineering Organization (WICGE) empowers and supports women at all career stages by fostering networking, mentorship, and advocacy for equal opportunities and representation in coastal geoscience and engineering fields. WICGE creates and supports a scientific community in which everyone is included regardless of gender identity. Join us at our splinter meeting, where we will discuss strategies to shatter the glass ceiling and advance gender equity in these fields. Everyone is welcome to participate, share experiences, and contribute ideas on how we can drive positive change. Through small group discussions, we will delve into various aspects of gender equity. These conversations will naturally transition into a social gathering, offering you the chance to connect with like-minded individuals, learn more about WICGE, and if you’d like, continue discussing gender equality. We look forward to your participation in building a more inclusive and equitable future in coastal geoscience and engineering. Join us at this informal event to expand your network and connect with fellow coastal scientists.

This Splinter Meeting will be an open-discussion workshop and a special session where participants can test a comprehensive feasibility framework for evaluating small-scale energy-harvesting technology. It will focus on discussing the potential challenges of conducting a comprehensive feasibility evaluation that goes beyond a technical feasibility assessment. By incorporating technical assessment with evaluation methods that assess economics, environmental impacts, social acceptance, barriers, socio-economic benefits, and associated risks associated with the deployment of these devices. It aims to define and identify potential barriers to the comprehensive feasibility of small-scale energy-harvesting technology, thereby enhancing and further supporting the continuous development of the H-Hope Feasibility Assessment Framework for Energy-harvesting devices.

The official kick-off meeting for the GeoRisk-Hub project, an innovative platform led by Istanbul Technical University aimed at revolutionizing the observation and risk analytics of geohazards such as landslides, wildfires, floods, and avalanches. As we confront the escalating threats posed by climate change and rapid urbanization, our mission is to construct a dynamic, AI-driven digital ecosystem that not only generates continuous, reliable data through advanced web scraping and Large Language Models (LLMs) but also transforms this information into critical decision-support tools for the insurance and reinsurance sectors. By adopting a robust "Generate-Verify-Model-Share" methodology, we will bridge the gap between scientific research and sectoral application, creating a standardized, scalable risk management infrastructure that supports the Sendai Framework. This meeting will serve as the foundational step to align our interdisciplinary team—spanning earth sciences, AI engineering, and urban planning, along with our partners at GLOBETECH—on our roadmap to build a more resilient, data-informed future. The meeting is open to all EGU members.

Following a short presentation on how researchers can effectively pitch (or present) their research to policymakers, this session will invite selected participants to give short (5 minute) presentations on their research to a panel of policymakers and those working on the science-policy interface. The panel will then give their feedback and provide insights on areas that those presenting can improve when discussing their research with policymakers in the future! Participants are also welcome to join this session as an audience member to listen to the initial presentation on how pitch to policymakers and then learn from the feedback that others receive. This will help those in the audience understand how to not only effectively present to policymakers but also which aspects of their work are likely to resonate with the policy community. The panel will assess up to four scientists during this session. Timeslots will be allocated on a first-come, first-served basis! You can already submit your topic for consideration here: https://www.egu.eu/forms/PitchingEGU26/

Session will highlight the work done by both GEO and the GEO-IDEA project (funded by the European Environment Agency) to support availability of in-situ Earth observation data for wider re-use.

This splinter meeting will introduce the ANTICIPATE COST Action (CA24144), a pan-European initiative dedicated to advancing extended-range (up to 46 days) multi-hazard predictions and early warning systems. Current operational forecasts typically focus on short-term single hazards, leaving a critical gap between weather and seasonal outlooks. ANTICIPATE aims to close this gap by fostering collaboration between meteorologists, climate scientists, disaster risk experts, and communication specialists to design next-generation anticipatory systems. This splinter meeting will bring these communities together to explore key themes: - The ambitions of the ANTICIPATE COST Action and plans for for the next 4 years. - Sources of predictability for multi-hazard events at extended lead times. - Integration of multi-hazard frameworks with experimental extended-range forecasts. - Development of early warning products to enable proactive disaster risk reduction. - Activities to explore stakeholder engagement and co-design for actionable communication strategies. Participants will discuss scientific challenges, operational needs, and opportunities for interdisciplinary research as part of the Action. The meeting will also highlight planned training and networking activities within ANTICIPATE, aiming to build capacity for forecasters and communicators across Europe. Join us to shape the future of multi-hazard early warning systems and contribute to a coordinated approach through ANTICIPATE that enhances societal resilience against extreme events.

Annual meeting with EU-funded multi-hazard risk projects to align the research and outreach work done in the different Horizon Europe and ESA funded projects working on multi-(hazard-)risk. EGU provides a unique opportunity for these different projects to get together in person to align their project work and collaborate, ensuring impacts beyond the duration of the different projects.

This meeting will present to the EGU community a new Risk KAN working group focused on the dynamics of vulnerability. We propose to bring together researchers from the risk management, climate adaptation, and associated areas to discuss and exchange. The aims of the working group are: - Identify common and divergent points in vulnerability definitions to enhance the robustness of vulnerability understanding and cross-study comparison. This will support a more nuanced, context-specific characterisation of vulnerability drivers, dynamics, measurement approaches, and outcomes. - Promote the development of conceptual and operational frameworks capable of tracking vulnerability dynamics. - Collect and promote best practices in data, methods, and evidence transferability and interoperability, including approaches in standardisation, generalisation, downscaling, and multimodal data harmonisation. - Facilitate inter- and multidisciplinary exchange among academics, practitioners, and decision-makers, particularly in the sectors of Disaster Risk Reduction (DRR), Disaster Risk Management (DRM), Humanitarian Assistance, Development, Climate Adaptation, and Climate Science. At this meeting, the WG leads will present the group, present the meeting schedule, and launch a collaborative effort to systematically map dynamic vulnerability case studies in a shared database. Come join us!

This splinter meeting serves as a common working group meeting of the IAG Joint Working Group (IAG JWG) to coordinate the work within our group. Our mission is aimed at researchers interested in using Global Navigation Satellite System (GNSS) sensors for mass-market (or low-cost) climate and environmental monitoring to redefine methods to enable reliable measurements. In addition to precise positioning, we are researching the determination of important variables such as the water equivalent of snow and the water vapour content of the atmosphere. Being a global initiative, our aim is to overcome technological boundaries and promote international co-operation to tackle the challenges of climate change. All researchers interested in the use of small-scale low-cost/mass-market GNSS sensors for climate monitoring and research are cordially invited to participate.

During the 2026 EGU General Assembly, the Joint Working Group “Tailored Parameterization Strategies for Climate Applications of Satellite Gravimetry” will meet. This JWG is part of the Inter-Commission Committee Geodesy for Climate Research (ICCC) of the International Association of Geodesy (IAG). This working group focuses on identifying and implementing spatiotemporally tailored parameterization strategies for satellite gravimetry observations designed for different climate applications. Building up from the simulation environments implemented in previous working groups, parameter models can be evaluated concerning their capabilities to represent climate-related mass transport signals and their feasibility in real data applications. To envision the possibilities that will arise with upcoming satellite gravity missions, improvements expected from MAGIC and future mission concepts shall be investigated next to current single-pair satellite GRACE-type missions. The parameter models shall be defined in close interaction with the respective applications to identify the main criteria to allow new science to emerge from the advanced parameterization strategies. In the meeting, the JWG will discuss planned activities, possible collaboration, and future research activities. Anyone interested in the activities of the Joint Working Group is warmly invited to join the meeting and contribute to the discussion. more info: https://geodesy.science/iccc/structure/jwg-c10/

Evapotranspiration constitutes one of the most significant fluxes of matter and energy within terrestrial ecosystems and serves as a key indicator of landscape functioning. A range of in situ measurement techniques—such as lysimeters, eddy covariance systems, and sap flux sensors—are now widely employed in monitoring networks and research initiatives to obtain high-quality field observations. These datasets offer substantial potential for secondary use, including methodological intercomparisons and refinements, upscaling efforts, and analyses of large-scale or long-term patterns. However, effective and efficient data reuse—and thus scientific progress—is frequently hindered or rendered impossible by insufficient or missing metadata. We invite the in-situ ET data producer and user community to give their feedback and thoughts to an initiative we've been pursuing since last year's EGU (and in-situ/remote-sensing ET session). From the contributions in our session and our experience we saw that comparing in-situ ET estimates from different methods as well as informed re-use of existing data is often hindered by a lack of relevant metadata and some uncertainty information. We propose a set of templates, adapted and expanded from existing initiatives such as ICOS, FLUXNET, SAPFLUXNET for eddy covariance, sapflow and lysimeter measurements. These templates include in our opinion missing metadata, and we welcome your feedback if the templates would help you as data producer to provide metadata which could increase the options for your data to be reused in different contexts, and from the data users if our suggestions make sense for your purposes. Our goal is to consolidate these considerations and templates in a forthcoming opinion paper.

This introductory splinter meeting, organised by the Allin-Wayra initiative, will bring together researchers, practitioners, and stakeholders working with low-cost air quality sensors across different regions. The session aims to align expectations, identify shared challenges, and outline priority areas for collaborative work on measurement, calibration, satellite integration, capacity building, and governance. Participants will contribute to framing a common vision and mapping the most relevant gaps and opportunities. This meeting will also prepare the ground for a short follow-up workshop later in the week, where concrete actions and working structures will be defined.

The Working Group (WG) "Co-Creating Water Knowledge" of the HELPING Initiative of IAHS (https://iahs.info/Initiatives/Scientific-Decades/helping-working-groups/co-creating-water-knowledge/) is active as a community of practice of researchers on different topics, working on understanding how the concept of co-creation can be used to integrate local and indigenous knowledge in hydrological sciences, and how hydrological knowledge can be integrated into them. This Splinter Meeting is an in-person opportunity to meet the WG and follow up on its activities.

The ordinary meeting of the governing bureau of International Lithosphere program. The meeting will review the status of ILP: https://ilp.nju.edu.cn/main.htm

We are convening a structured discussion on the science at the intersection between tipping points and solar radiation management (SRM). We acknowledge there is a diversity of opinions on SRM, and we emphasise that there is currently no basis for premature deployment of SRM based on tipping points science, and that researching SRM is very different from its deployment. Our goal would be to explore interactions between SRM and tipping dynamics, including whether and how SRM could either reduce or increase known tipping point risks, and whether it could introduce novel tipping risks or other undesired impacts. Preliminary results suggest that a uniform deployment of stratospheric aerosol injection, in conjunction with strong emission cuts, may help avoid the onset of many tipping points, and, for example, that marine cloud brightening in the Arctic could reduce the decline in the Atlantic Meridional Overturning Circulation. However, it is crucial to acknowledge that the climate models used in these studies miss many key processes which might fundamentally challenge these conclusions. Moreover, there is some uncertainty on the climate impact of SRM and there are known tradeoffs, which include, for example, a delay in the recovery of the ozone layer for stratospheric aerosol injection. In January 2026 tipping points and SRM researchers gathered in London for a workshop on this topic, organised by ARIA (the UK's Advanced Research & Invention Agency). This workshop noted the need for a wider discussion of research directions amongst the earth system science community. We would therefore like to invite interested earth system scientists with relevant expertise to discuss future research avenues at this intersection between tipping points and SRM.

Key actions in the climate adaptation field

When proposing new legislation or updating an existing policy, decision-makers often open a public call for evidence! This allows individuals and institutions to provide information that is relevant to the topic so that it can be considered! Submitting evidence can take many forms - from informal discussions to formal online feedback forms. This Splinter meeting will discuss a range of different options! It will then focus on the EU Commission’s consultation process and provide practical tips on how researchers can engage with it! Led by policy experts, this Splinter Meeting will not only provide participants with all the information that they need to provide evidence, but also with tips on how to frame evidence so that it is actually used!

We established a group of (around 50) scientists interested in dendrometer measurements. A first workshop was held in Norway in October 2025. Besides online meetings, we aim at having a physical meeting ca. once a year as well. Many of the participants are attendees of the EGU General Assembly, therefore we use the opportunity to held a splinter dendrometer meeting here.

ILP (International Lithosphere Program) has a tradition to present and discuss its activities during the EGU General Assembly. The meeting will include presentation of this year's Burov medal and Flinn-Hart award. This meeting is open to all interested participants. More information is available at https://ilp.nju.edu.cn/main.htm. Public information: The meeting will begin at 16.30 and continue until 20.00 with a break mid-way. Everyone interested in the activities of ILP is invited to participate.

GTM invites its friends, members and partners to an open discussion forum. Meet the board members and other relevant stakeholders.

Splinter meeting to discuss potential future work on AI for atmospheric transport and inverse modeling. Short presentations + discussion/round table.

The global tephra community has rallied behind developing a framework of best practice recommendations and tephra data accessibility for the last decade (Wallace et al., 2022). To increase usability and to aid users in adopting the best practices into their workflow, we have collaborated with the developers of StraboSpot (https://www.strabospot.org/), a free, open- source tablet, phone, and web app for field data collection for the geologic community. The addition of tephra-specific fields to a new StraboSpot Tephra module enables users to consistently collect and report essential tephra data in the field which is then automatically saved to an online data repository. This meeting will provide hands-on training for setting up a field project using the Tephra module of StraboSpot.

ILP (International Lithosphere Program) has a tradition to present and discuss its activities during the EGU General Assembly. The meeting will include presentation of this year's Burov medal and Flinn-Hart award. This meeting is open to all interested participants. More information is available at https://ilp.nju.edu.cn/main.htm. Public information: The meeting will begin at 16.30 and continue until 20.00 with a break mid-way. Everyone interested in the activities of ILP is invited to participate.

The global tephra community has rallied behind developing a framework of best practice recommendations and tephra data accessibility for the last decade (Wallace et al., 2022). To increase usability and to aid users in adopting the best practices into their workflow, we have collaborated with the developers of StraboSpot (https://www.strabospot.org/), a free, open- source tablet, phone, and web app for field data collection for the geologic community. The addition of tephra-specific fields to a new StraboSpot Tephra module enables users to consistently collect and report essential tephra data in the field which is then automatically saved to an online data repository. This meeting will provide hands-on training for setting up a field project using the Tephra module of StraboSpot.

Three international working groups are currently engaged in determining, interpreting, and predicting EOP: (1) IERS/IAG/IAU Working Group on EOP Prediction, (2) GGOS Joint Study Group 3: AI for Earth Orientation Parameter Prediction, (3) ICCC Joint Working Group C.1: Climate Variability and Climate Change in Earth Orientation Parameters. This splinter meeting brings together scientists with interests in the topics addressed by these working groups. In particular, it aims to discuss recent achievements and future directions in EOP prediction, with a focus on activities related to the Second EOP Prediction Comparison Campaign (2nd EOP PCC) and its sub-campaign dedicated to machine-learning-based prediction approaches (EOP PML).

The GEWEX Global Groundwater Network’s mission is to constructively link hydrogeology and groundwater modeling to Earth System modeling in the Hydroclimate Panel (GHP) of GEWEX and beyond (https://www.gewex.org/ggn/). The Global Groundwater Network brings together scientists from the hydrogeologic and groundwater flow modeling communities with the land surface and Earth system modeling communities to formulate a concrete, multi-year science and research agenda. The Network will focus on contributing the hydrogeologic perspective to Earth system modeling. We encourage hydrogeologists and Earth system modeling community to actively participate in the Global Groundwater Network by contributing their expertise and actively shaping the groundwater modeling agenda in Earth system modeling and GEWEX. The core activities as part of Global Groundwater Network’s mission are to build a strong community and establish a constructive, consistent voice for hydrogeology and groundwater modeling in Earth system modeling and GEWEX framework; include hydrogeologists and groundwater modelex into GEWEX and WCRP working groups and panels for dialogue; identify benefits and opportunities for injecting hydrogeology and groundwater modeling into Earth system modeling and GEWEX; define a scientific agenda of hydrogeology and groundwater modeling in Earth system modeling and GHP, GEWEX; training in hydrogeologic and groundwater flow modeling best practices.

The HALO-South flight campaign, conducted in September–October 2025 in New Zealand, aimed to improve understanding of gas-phase chemistry, aerosol processes, cloud formation, and radiative impacts in the Southern Hemisphere. Around 20 campaign participants attending EGU26 will meet to exchange results, identify common flights of interest, discuss joint publications, and define next steps for collaborative analyses.

In this kick-off meeting we will introduce Open Thermochronology, a new community initiative to promote open science using thermochronology through the use of open-source modeling software, standardized data formats and tools for data reduction, software to produce common plots, and shared libraries of kinetic parameters. This initiative is very much in its infancy and intended to be community led. Thus, the aim of this meeting is to share an overview of preliminary goals of the initiative, ideas for the initial steps in development, and encourage community members to get involved in shaping its future. This is the first of several planned meetings at large geoscience conferences (EGU, GSA, and/or AGU), with the idea of developing the aims of the initiative in preparation for a more formal workshop (at Thermo2027, for instance), where more structured plans could be established. We invite anyone working with (or interested in working with) thermochronology to join this meeting, from early-career to senior scientists, and from those working on laboratory measurements to modelers. If you are curious about what Open Thermochronology might involve, join us and find out more!

The Kotak School of Sustainability (KSS) at IIT Kanpur is India’s first fully integrated school dedicated to advancing sustainability research, education, and innovation. KSS seeks to bring together scientists, engineers, and policymakers to drive impactful solutions for a sustainable future. Its interdisciplinary approach aims to address critical challenges related to climate change, air quality, energy transitions, environmental monitoring, and climate-resilient development. This splinter meeting session introduces the vision and research priorities of KSS, highlighting opportunities for collaboration with the international geoscience community. The discussion showcases ongoing and emerging research themes, the school’s multidisciplinary educational framework, and mechanisms for building academic, industry, and policy partnerships. The session also outlines prospective opportunities for researchers, faculty, and early-career scientists interested in joining KSS and contributing to its expanding sustainability ecosystem. Participants are invited to explore potential joint projects, faculty and student exchanges, capacity-building initiatives, and avenues for global cooperation that support India’s long-term sustainability goals. The session offers an open platform to connect, exchange ideas, and shape collaborative efforts towards a sustainable future.

The Horizon Europe-funded project "ENVRINNOV – ENVironment Research Infrastructures Innovation Roadmap," is working towards developing a common Innovation Roadmap for the environmental research infrastructures (ENVRIs) community. As part of the project, a series of capacity building sessions is being developed to promote collaboration and establish a shared understanding of Innovation concepts and processes in the ENVRI community, including on Technology Development, Technology Transfer, and Industrial Approach. Following the success of our first session organised at EGU25 on "ENVRI and Industry: How to Better Collaborate for Innovation, and the online webinar “ Innovation Management in Research Infrastructures”, we are excited to announce the third ENVRINNOV training session specifically designed to enhance your knowledge and expertise in innovation and technology transfer within research infrastructures. Here are the topics covered: Overview of Intellectual Property Rights IP Management in Publicly Funded Research The Technology Transfer Process Case Studies This training session is a follow up to the webinar training session organised early 2026. However, we warmly invite all members of the ENVRI community, as well as anyone interested in innovation in environmental research infrastructures, to participate in this interactive and engaging training session.

The HALO-South flight campaign, conducted in September–October 2025 in New Zealand, aimed to improve understanding of gas-phase chemistry, aerosol processes, cloud formation, and radiative impacts in the Southern Hemisphere. Around 20 campaign participants attending EGU26 will meet to exchange results, identify common flights of interest, discuss joint publications, and define next steps for collaborative analyses.

The 5th International Polar Year (IPY) in 2032-33 aims to address urgent global challenges by advancing polar research, focusing on the impacts of climate change in the Arctic and Antarctic. This coordinated effort will bring together scientists, Indigenous knowledge holders, and global stakeholders to produce actionable insights for mitigating and adapting to environmental changes, while promoting international collaboration and inclusivity. ​​IPY Tasks Groups (TGs) are short-term groups, mandated by the IPY Planning Group, to work on developing a strategy for specific aspects of the IPY-5 planning process. The Task Group on Capacity Building and Early Career Coordination (TG4) is co-led by the Association of Polar Early Career Scientists (APECS) and University of the Arctic (UArctic). It aims to create a detailed plan to ensure the representation of young voices and integration of capacity building activities for future generations of polar professionals in the lead up to and during IPY-5. The APECS International Directorate is hosting this splinter meeting to create a space for the European geoscience community to provide an overview of the current status of the planning and to gather input for co-developing a plan for early career coordination and capacity building activities in the context of the IPY. This workshop is organised by members of the IPY-TG4 and participation is open to everyone - including community members not connected to the IPY planning yet. The organizers specifically encourage early career professionals to attend, ensuring that early-career perspectives inform both strategy and practice for long-term polar research planning.

Strengthening the link between scientific research and official greenhouse gas (GHG) reporting is an important step under the Paris Agreement’s Enhanced Transparency Framework. The PARIS Project, funded by Horizon Europe, is working with eight European countries to develop practical tools for this purpose. A central innovation of PARIS is the development of draft annexes to National Inventory Documents (NIDs). These annexes provide a structured and transparent interface between official bottom-up inventories and top-down atmospheric estimates. They do not alter formal reporting rules; instead, they document how independent scientific assessments compare with inventory estimates, identify consistencies and discrepancies, and highlight where further investigation or methodological development is warranted. In this way, the annexes enable inventory compilers, policymakers, and scientists to interpret atmospheric results within the legal and institutional framework of national reporting. The annexes are underpinned by major advances in PARIS observation and modelling capacity. Expanded and harmonised networks for CH₄, N₂O, F-gases, APO and aerosols, together with multi-model inverse systems and common data standards publicly available on the ICOS Carbon Portal, provide robust, traceable estimates of regional emissions and their sectoral drivers. These scientific outputs are synthesised in the annexes in a form that is directly usable by inventory agencies. Through close engagement with national inventory teams in the UK, Switzerland, Germany, Ireland and other focus countries, PARIS has co-developed annex templates and begun populating them with results from multiple inversion systems. This process reduces barriers between the research and inventory communities and supports routine, transparent comparison of bottom-up and top-down estimates. During the splinter meeting we would like to discuss the main outcomes of the PARIS project, demonstrating how it advance and embed atmospheric science in national GHG reporting to strengthen confidence in emission estimates, improve process attribution of regional emissions, and ultimately support more effective climate policy under the Paris Agreement.

The PermaCOST COST Action (CA24157) is a new funded network aiming to bring together European permafrost researchers, stakeholders, and practitioners with expertise in different measurement techniques and permafrost conditions to work towards a coordinated and standardized monitoring of permafrost response to climate change. This splinter meeting will bring the PermaCOST community together to explore key themes: (1) the ambitions and plans of the Action during 4 years (2025-2029), (2) the identified key emerging permafrost methods and parameters complementary to borehole temperature and active layer thickness and their implementation plan, (3) the initial results of a community survey aiming to provide an overview of the permafrost research community in Europe, (4) the planning of WG2 (permafrost data acquisition standards) and WG3 (permafrost data processing standards and routines), and (5) promoting and supporting the regional and national permafrost networks across Europe and beyond. Join us to help shape the future of permafrost monitoring and contribute to a coordinated and standardized monitoring of permafrost response to climate change and to learn more about the funded networking activities by PermaCOST on the topic of permafrost (including research exchanges, training schools, conference grants, workshops on specific techniques, etc.) https://www.cost.eu/actions/CA24157/ ; www.permacost.eu

The three sister projects (CryoSCOPE, ICELINK, LIQUIDICE) convened a splinter meeting at EGU 2025, with more than 30 researchers in attendance. Following the discussions, the sister projects are aimed at jointly organizing Session CR6.8 at the EGU 2026: Linking observations and models of inland ice, snow, and permafrost dynamics. In this context, the project coordinators would like to request the organization of a follow-up meeting during this year’s EGU. The purpose of this meeting is to further explore scientific synergies, strengthen collaboration on Cryosphere–Atmosphere–Hydrosphere interaction mechanisms, and identify how our projects can collectively contribute to broader project clusters. We would greatly appreciate your support in arranging this meeting.

Annual meeting with EU-funded multi-hazard risk projects to align the research and outreach work done in the different Horizon Europe and ESA funded projects working on multi-(hazard-)risk. EGU provides a unique opportunity for these different projects to get together in person to align their project work and collaborate, ensuring impacts beyond the duration of the different projects.

SURFEIT Programme Meeting for those international members attending EGU.

The International Commission on Human-Water Feedbacks of the International Association of Hydrological Sciences (IAHS) focuses on the feedbacks between humans and water over decadal and centennial time scales. We therefore mainly consider changes that involve a two-way coupling between human actions and water quantity and quality, i.e. how the water environment and humans coevolve. We are inclusive and interdisciplinary and invite all interested people, regardless of their field, be it social sciences, economics, engineering, hydrology, etc., from all career levels and regardless of memberships in commissions or IAHS. Come to our splinter meeting when interested in collaborating and discussing on Human-Water Feedbacks, e.g. sharing knowledge, information, papers and organise joint studies and activities.

The Horizon Europe-funded project "ENVRINNOV – ENVironment Research Infrastructures Innovation Roadmap," is working towards developing a common Innovation Roadmap for the environmental research infrastructures (ENVRIs) community. As part of the project, a series of capacity building sessions is being developed to promote collaboration and establish a shared understanding of Innovation concepts and processes in the ENVRI community, including on Technology Development, Technology Transfer, and Industrial Approach. Following the success of our first session organised at EGU25 on "ENVRI and Industry: How to Better Collaborate for Innovation, and the online webinar “ Innovation Management in Research Infrastructures”, we are excited to announce the third ENVRINNOV training session specifically designed to enhance your knowledge and expertise in innovation and technology transfer within research infrastructures. Here are the topics covered: Overview of Intellectual Property Rights IP Management in Publicly Funded Research The Technology Transfer Process Case Studies This training session is a follow up to the webinar training session organised early 2026. However, we warmly invite all members of the ENVRI community, as well as anyone interested in innovation in environmental research infrastructures, to participate in this interactive and engaging training session.

Despite its remote location, the Arctic is subject to a myriad of trace gas and aerosol sources originating both from long-range transport from lower latitudes and rapidly emerging and changing local sources. Changes in trace gas and aerosol in the Arctic contribute to climate change, affect clouds, sensitive ecosystems, and have important impacts on local Arctic residents. The air Pollution in the Arctic: Climate, Environment and Societies (PACES) initiative is an established bottom-up community activity to address deficiencies in our understanding of sources, processing and fate of Arctic air pollution. Important remaining knowledge gaps have implications for our confidence in predicting future Arctic climate response to remote and local emission changes, potential effects of increases in local sources resulting from increased Arctic development and changes in natural systems, and societal and ecosystem impacts of Arctic air pollution. The overarching aim of PACES is to create new collaborative efforts between observational and modelling groups, social science researchers and local Arctic communities to address these issues, and to provide international community leadership in the coordination of large international collaborative efforts, such as coordinated field experiments and model comparison and evaluation exercises. This splinter meeting will present updates on PACES activities centred around its two Working Groups, respectively focused on improving knowledge of short-lived climate pollutants and their impacts in the Arctic, and on improving understanding of sources, processing and fate of locally-sourced Arctic air pollutants. The meeting will include updates on a new PACES initiative, “Arctic RISE” which is aiming to develop and implement a new network of widespread, coordinated, sustained, regular atmospheric vertical profile measurements across the Arctic to be operational during the International Polar Year (IPY) 2032-33.

The splinter meeting is intended to foster interdisciplinary and international exchange and collaboration concerning Aerosol Chemistry, Multiphase Chemistry, and their interplay and impacts in the Earth system, climate, and public health. The splinter meeting provides a platform" for informal exchange and discussions building on and complementary to the regular scientific sessions of the EGU General Assembly.

The IAHS Working Group MOXXI (Measurements and Observations in the XXI Century) Splinter Meeting at EGU 2026 will bring together the hydrological community to review the state of the art of ongoing MOXXI initiatives. The meeting will provide concise updates on current activities, outputs, and collaborations, and will also host an open discussion to identify priorities and future directions, shaping new initiatives and strengthening coordination across emerging technologies, operational monitoring, and scalable observation strategies.

In person meeting for the ISAMO group: Iron Salt Atmospheric Methane Oxidation (ISAMO) Research on advancing our understanding of existing atmospheric oxidation processes hypothesized to be naturally removing more atmospheric methane than previously studied.

Strengthening the link between scientific research and official greenhouse gas (GHG) reporting is an important step under the Paris Agreement’s Enhanced Transparency Framework. The PARIS Project, funded by Horizon Europe, is working with eight European countries to develop practical tools for this purpose. A central innovation of PARIS is the development of draft annexes to National Inventory Documents (NIDs). These annexes provide a structured and transparent interface between official bottom-up inventories and top-down atmospheric estimates. They do not alter formal reporting rules; instead, they document how independent scientific assessments compare with inventory estimates, identify consistencies and discrepancies, and highlight where further investigation or methodological development is warranted. In this way, the annexes enable inventory compilers, policymakers, and scientists to interpret atmospheric results within the legal and institutional framework of national reporting. The annexes are underpinned by major advances in PARIS observation and modelling capacity. Expanded and harmonised networks for CH₄, N₂O, F-gases, APO and aerosols, together with multi-model inverse systems and common data standards publicly available on the ICOS Carbon Portal, provide robust, traceable estimates of regional emissions and their sectoral drivers. These scientific outputs are synthesised in the annexes in a form that is directly usable by inventory agencies. Through close engagement with national inventory teams in the UK, Switzerland, Germany, Ireland and other focus countries, PARIS has co-developed annex templates and begun populating them with results from multiple inversion systems. This process reduces barriers between the research and inventory communities and supports routine, transparent comparison of bottom-up and top-down estimates. During the splinter meeting we would like to discuss the main outcomes of the PARIS project, demonstrating how it advance and embed atmospheric science in national GHG reporting to strengthen confidence in emission estimates, improve process attribution of regional emissions, and ultimately support more effective climate policy under the Paris Agreement.

This invite-only meeting is for the Community Advisory Board of the Tephra Information Portal. Members will meet to discuss project goals, community needs, and best practices in FAIR data stewardship, sustainability, and inclusivity.

The International Soil Moisture Network (ISMN, https://ismn.earth) provides freely accessible soil moisture data and ancillary observations, including precipitation, air and soil temperature and snow information. All data within the ISMN are harmonized and quality controlled to best serve our users. In addition to providing data, ISMN actively engages with soil moisture observation specialists, data providers, data users and scientists. These efforts aim to foster the cooperation among this groups and build a community of soil moisture enthusiasts. This splinter meeting is intended to support these efforts. After a brief introduction of 5-10 minutes, participants will have the opportunity to meet and discuss topics of interest. We will also have a poster presentation during the meeting where we will showcase recent advancements from ISMN including data availability and usage of ISMN data, ISMN’s quality control procedure, soil moisture sensor technologies and services utilizing ISMN data. However, we welcome discussions about any other related topic as well. We hope to bring together data providers, sensor manufacturers and data users to facilitate discussions and share experiences.

The three sister projects (CryoSCOPE, ICELINK, LIQUIDICE) convened a splinter meeting at EGU 2025, with more than 30 researchers in attendance. Following the discussions, the sister projects are aimed at jointly organizing Session CR6.8 at the EGU 2026: Linking observations and models of inland ice, snow, and permafrost dynamics. In this context, the project coordinators would like to request the organization of a follow-up meeting during this year’s EGU. The purpose of this meeting is to further explore scientific synergies, strengthen collaboration on Cryosphere–Atmosphere–Hydrosphere interaction mechanisms, and identify how our projects can collectively contribute to broader project clusters. We would greatly appreciate your support in arranging this meeting.

The objective of this meeting is twofold: 1. To present in detail the advances of the FireCCI and XFires projects, the new Burned Area and Extreme Fire Events products (characteristics, advances and limitations), and the analysis being performed using those datasets; and 2. To gather feedback of the current or potential users regarding the usability of the products and requirements for future improvements and new developments.

Join the community for an informal meeting to brainstorm, discuss, and initiate next steps towards the future of Cosmic-Ray Neutron Sensing: a frontier technology for monitoring of soil moisture, biomass, snow, space weather, and beyond. Following the recent workshops in Ireland and Nebraska, we want to build on the momentum to discuss plans and pathways for future strategies of our community. Strongly linked to the scientific session GI4.7, the talking points will include effective ways of communication to enhance onboarding for newcomers as well as global-scale collaboration and outreach, harmonized and up-to-date data processing, data availability and easy data access, and potential plans for special issues and topical review papers.

How can we come closer to a global unified model of mass transport? In this splinter meeting we want to bring together cryosphere scientists, terrestrial hydrologists, and geodesists to plan a common workshop on the topic of combining glacier and hydrological models and what it needs for fruitful collaboration towards a unified model. This meeting is part of the International Association of Geodesy (IAG) Working Group 1.2.3 activities.

The Monitoring Stations Assembly of the ecosystem part of ICOS meets regularly twice a year. As many of its members are also EGU attendees, we use the opportunity to have a face-to-face meeting in Vienna.

The splinter meeting is intended to foster interdisciplinary and international exchange and collaboration concerning Aerosol Chemistry, Multiphase Chemistry, and their interplay and impacts in the Earth system, climate, and public health. The splinter meeting provides a platform" for informal exchange and discussions building on and complementary to the regular scientific sessions of the EGU General Assembly.

Meeting associated to the EarthSafe MSCA Doctoral Network.

This splinter meeting brings together partners and collaborators of the Horizon Europe project Past 2 Future (P2F - Grant No. 101184070). A key objective is to facilitate cross-disciplinary conversations between paleo-data specialists, climate modelers, and researchers focusing on theoretical approaches and regional impacts. We will discuss the first results of the proxy data synthesis workshop and this meeting will serve as a platform to coordinate technical inputs and expectations for the upcoming periodic reporting period. Further, will also explore initial outreach efforts to connect our scientific findings with diverse communities and stakeholders. All consortium members present at EGU are encouraged to participate.

This workshop is related to the project "EGU High School Geoscience Engagement Initiative – Mission Earth" that is funded by EGU in the framework of the Special Activity Fund. The workshop will be designed for invited participants and ran by R. Haacker, Jo Hecker (Science Entertainer) and others. The meeting is foreseen to be run in two timeslots.

Open workshop to explore the usage of digital twins, with focus on Destination Earth (DestinE) in the sector of climate adaptation. The event will provide: (1) short presentation on Digital Twins on climate change and extremes and relevant data assets, tools and applications. (2) provide an overview of the lessons learnt from EGU (3) explore how the experience gathered in user oriented DestinE projects can inform the climate adaptation research projects (4) gather priorities to enhance risk assessments and support effective, climate analysis and common user needs for the further development of DestinE. The meeting will focus on open exchange and discussion with participants input.

This splinter meeting complements the EGU Short Course Best Practices for Early Career Researcher (ECR) Engagement and Empowerment, offering space for in-depth discussion and direct interaction between ECRs and senior researchers. Building on insights from previous courses and webinars, the meeting will expand on key themes introduced during the Short Course, including enabling factors, community building, event organization, and financial support. The session is primarily intended for senior researchers and professionals interested in strengthening ECR involvement within their groups, projects, and institutions. It also welcomes those unable to attend this year’s Short Course but who wish to engage with its core topics. We warmly invite senior researchers and professionals who are interested in fostering supportive, empowering, and collaborative research environments.

We will hold a meeting of the GEO-GSNL community to discuss a new governace model and start the election process for the new governance.

As global efforts to mitigate and adapt to climate change continue to fall short, recent court judgements clarify the obligations of governments and private actors in relation to climate change. The recent groundbreaking Advisory Opinion from the International Court of Justice reinforces the scientific basis for defining the obligations of states to address climate change and emphasizes the growing role of science in climate-related litigation. This open splinter meeting invites geoscientists with an interest in climate change litigation to explore the implications of the Advisory Opinion and other recent climate litigation developments. We invite participants to engage in meaningful discussions on the scientific needs for effective climate litigation. Our aim is to foster dialogue, share innovative ideas, and deepen understanding of how collaboration between the fields of science and law can best serve societal needs.

This workshop is related to the project "EGU High School Geoscience Engagement Initiative – Mission Earth" that is funded by EGU in the framework of the Special Activity Fund. The workshop will be designed for invited participants and ran by R. Haacker, Jo Hecker (Science Entertainer) and others. The meeting is foreseen to be run in two timeslots.

Measuring climate adaptation remains a major challenge, particularly when moving beyond tracking processes and outputs towards assessing real-world outcomes and long-term impacts. This splinter meeting brings together researchers from different scientific communities to discuss how adaptation is currently being measured, what methods and indicators are used across disciplines, and where key gaps remain. We will explore conceptual and methodological advances for capturing effectiveness, equity, and transformative change, and reflect on how monitoring and evaluation frameworks can better inform decision-making under uncertainty. The session aims to foster cross-disciplinary exchange and identify priorities for advancing adaptation measurement in research and practice.

To mature our new Earth observation (EO) mission idea (NEOMI), we would like to have a splinter meeting to discuss with experts in studying the effect of EEP on the atmosphere. We will discuss the expected scientific innovation or societal benefit that potentially can be addressed through EO satellite in-situ measurement. We will discuss the scientific aim and objective for NEOMI, traceability to priorities and user needs, for example through links to potential scientific innovation, societal benefit, or relevant literature such as journal articles.

With population growth, expanding infrastructure, and a changing climate, volcanic risk is becoming increasingly complex, particularly within multi-hazard environments. Volcanic eruptions are inherently multi-hazard events themselves, but they may also coincide with other hazardous phenomena such as typhoons or heavy rainfall. They can also trigger secondary hazards such as wildfires, lahars, or flooding. While volcanic hazard modelling has advanced for individual hazards, integrating volcanic hazards together, and into broader multi-risk frameworks remains a challenge. This splinter meeting brings together researchers, emergency managers, and other stakeholders from a range of disciplines and hazards, including from volcanology, volcano monitoring and emergency management, hazard and risk modelling, exposure and vulnerability analysis, disaster risk reduction, and risk communication. We will examine how volcanic risk can be better analysed and managed within a multi-hazard context. The meeting will identify current progress, existing needs and gaps, and emerging opportunities. Key themes include data and modelling, cascading and compounding processes, and exposure and vulnerability, with a focus on enhancing volcanic communication for emergency management. The session will include quick fire talks by multi-hazard researchers to stimulate a discussion. Participants will use post-it notes to fill in during and after talks so that ideas can be captured and discussed to identify key priorities. An expected outcome is the creation of a working group to draft a white paper on multi-hazard volcanic risk. The meeting is open to all.

TRAILS is a network of scientists funded by the German Research Foundation to discuss new approaches to model groundwater quality-related processes across large scales. Specifically, TRAILS aims to identify knowledge gaps around representing the interaction between groundwater and surface water bodies. At this splinter meeting, we will review the current status of our group and decide on the next steps for our research.

This follow up to a recent workshop brings together researchers with an interest in atmosphere-ice-ocean research focussing on chemical, biogeochemical and physical processes in the Arctic and Antarctic and links to climate change. The aim of the meeting is to build upon discussions of research priorities and implementation pathways for research activities in field, laboratory and modelling in the lead-up to and during the 5th International Polar Year (IPY-5) 2032-2033. Discussion points will include • Flux measurements • Vertical profiles • Towards long-term measurements and integrated observatories • Links to Antarctica InSync The meeting is supported by the international activities CATCH, BEPSII, PACES, ASPeCt, QuIESCENT and PICCAASO, and the SCOR WG CIce2Clouds.

We will hold a meeting of the GEO-GSNL community to discuss a new governace model and start the election process for the new governance.

Internal meeting of the IAHS Drought in Mountain Regions working group, within the IAHS HELPING initiative

For users and developers of the Elmer/Ice modelling software

This short workshop builds on the Allin-Wayra introductory splinter meeting held earlier in the week. Its purpose is to transform initial discussions into concrete collaborative outputs. Participants will work in small thematic groups to define specific actions, near-term deliverables, responsible leads, and mechanisms for communication. Topics may include harmonised practices, QA/QC, uncertainty, community engagement, and regional capacity building. The session will conclude with a concise roadmap detailing post-EGU follow-up steps for each working group. Attendance at the first splinter is encouraged but not required.

As global efforts to mitigate and adapt to climate change continue to fall short, recent court judgements clarify the obligations of governments and private actors in relation to climate change. The recent groundbreaking Advisory Opinion from the International Court of Justice reinforces the scientific basis for defining the obligations of states to address climate change and emphasizes the growing role of science in climate-related litigation. This open splinter meeting invites geoscientists with an interest in climate change litigation to explore the implications of the Advisory Opinion and other recent climate litigation developments. We invite participants to engage in meaningful discussions on the scientific needs for effective climate litigation. Our aim is to foster dialogue, share innovative ideas, and deepen understanding of how collaboration between the fields of science and law can best serve societal needs.

Organized by the EU project EQUIP-G, we invite all interested persons on the topic of "quantum gravimetry" to join this community session. With the format of an open discussion (with some input and structure by the project), the goal is to connect, exchange, discuss or just get to know each other. Of course you can ask any question or bring something to share with the community.

Members of the IUGG leadership participating in the EGU26 will offer exchanges with representatives of the associations, Union commissions and committees, as well as with national delegates.

This session will engage with the EGU community to solicit their input on the future of the Shared Socioeconomic Pathways community scenario framework (O'Neill et al,. 2021). We will have the scenario user survey available and run an in-person focus session to learn from scenario user experiences and their needs for changes to the community scenario framework. The session will be organized by the International Committee for New Climate Change Assessment Scenarios (ICONICS).

Key actions in the climate adaptation field (part2)

The purpose of this meeting is to discuss ways to advance the development and application of Artificial Intelligence as a transformative tool for understanding and mitigating complex weather- and climate-related risks across timescales, from immediate hazards to near-term projections and decadal to centennial foresight. We believe that AI holds unique potential to support the entire early warning chain, encompassing systemic forecast or prediction tasks beyond weather (i.e. hazards and impacts), as well as communication and early warning tasks and decision support applications. In addition AI holds the potential to better understand and model complicated impact relationships under future climate conditions. This Splinter Meeting is an Initiative of the Risk KAN Working Group on AI for Complex Climate Risk Mititation (https://www.risk-kan.org/about-riskkan/working-groups/ai-for-complex-climate-risk-mitigation/)

We invite the members of the HELPING WG "Hydrologic Design: Solutions and Communication" and all other colleagues interested in the topic to join us for this splinter meeting. We will have an invited talk with perspectives on practical challenges of hydrological design with a follow-up discussion.

With a start in SPM75 at EGU24, a Controlled Source Seismics (CSS) community has formed with the aim of bringing CSS data to the European Plate Observing System (EPOS). During the last two years, this community developed a data model for describing CSS data sets and established a data service for testing. In this splinter meeting we want to present and discuss the achievements and define the way forward, towards joining EPOS and actually contributing data. All colleagues who regard themselves as part of the wider controlled/active source seismics community are welcome, both data producers and data consumers. EPOS, the European Plate Observing System, is a multidisciplinary, distributed research infrastructure that facilitates the integrated use of data, data products, and facilities from the solid Earth science community in Europe. The EPOS Data Portal is a virtual platform where FAIR principles are put into practice, enabling access to data and products from more than 250 scientific data services across Europe. Data and data services provided by EPOS are defined in a bottom-up approach by the experts in the respective thematic communities. Organised as Thematic Core Services, these communities are also responsible for providing their data and data services to EPOS.

The International GNSS Service (IGS) is part of the International Association of Geodesy (IAG) and is a core contributor to the Global Geodetic Observing System (GGOS). Since 1994, the IGS has provided open access to high-quality GNSS data and products, which support — among other applications — the International Terrestrial Reference Frame (ITRF) realization. This splinter meeting serves to present the latest status updates of the IGS Bias & Ambiguity Resolution (BAR) committee [https://igs.org/wg/bias-and-ambiguity-resolution/] as well as from Wuhan Combination Center (WCC) [https://igs.org/wg/wcc/]. Current issues and next steps will be discussed in relation to satellite bias products and their combination.

This session will engage with the EGU community to solicit their input on the future of the Shared Socioeconomic Pathways community scenario framework (O'Neill et al,. 2021). We will have the scenario user survey available and run an in-person focus session to learn from scenario user experiences and their needs for changes to the community scenario framework. The session will be organized by the International Committee for New Climate Change Assessment Scenarios (ICONICS).

There have been enormous advances in the use of earth observation technology for water quality monitoring over most recent years. However, despite these developments the technology is rarely used in national or regional water quality monitoring programmes. A recent report of the European Commission Joint Research Centre (Attila et al. 2025) highlighted that only 3 of the 22 European countries from which EO experts responded to a survey are currently using earth observation data to report on the Water Framework Directive. Obstacles preventing a wider implementation that were identified in the survey include: o A lack of common guidelines on how to utilize EO for WFD reporting, o Legal issues regarding EO application in the current WFD monitoring guidelines, and o A lack of information about EO tools. This emphasizes the importance of Output 1 of the implementation plan of the UNESCO International Initiative on Water Quality (IIWQ), to empower water quality management institutions to use remote sensing for monitoring of inland freshwaters. IIWQ is a flagship initiative of the UNESCO Intergovernmental Hydrology Program (IHP) that promotes scientific collaboration between researchers, practitioners and policymakers worldwide, with the overall objective to advance the knowledge base of water quality science to enable Member States to effectively monitor, assess, and manage their water quality. With this objective in mind, an output focussing on earth observation was defined in the IIWQ implementation plan for the 9th phase of IHP (2022-2029). Planned activities include: • The development of a unified approach for satellite monitoring of inland water quality, • The development of local and global water quality portals that include satellite data, and • The organisation of capacity development workshops for water quality managers. This EGU Townhall Meeting is scheduled to target earth observation experts in the scientific community that are interested to join a collaborative network to promote the application of EO data for national and regional water quality reporting. This meeting will also kickstart the preparation for a Union Symposium on the topic at EGU27. Cooperative sessions, on other IIWQ Outputs, are planned at AGU26 and JpGU27, organized by the regional co-leads of IIWQ.

AdriaArray is a multinational initiative to identify geodynamic drivers of plate deformation and geohazards in the central Mediterranean region. Basis is a passive seismic experiment comprising 1,068 permanent and 440 temporary broadband stations from 23 mobile pools, which were deployed between 2022 and 2026. The deep structure of the area, including double-sided subduction and collisional orogens, will be imaged. Seismicity will be consistently detected and located, and the area's plate kinematics, topography, uplift and deformation rates, and the stress field will be physically modelled and compared to observations. At the meeting, we summarise the current status of AdriaArray, present the outcome of the 7th AdriaArray Workshop in Sopron (Hungary), and discuss the preparation of the 8th AdriaArray Workshop in 2027.

The IAVCEI / IASPEI commission for Volcano Seismology and Acoustics has recently voted for a new committee - this will be the first in-person meeting of the committee and anyone part of the commission who is interested in the future work of the commission.

This splinter meeting will be an informal place for members of the WATSON (WATer isotopeS in the critical zONe) COST Action to meet and exchange ideas. The meeting will start with a short update from the WATSON COST Action. For more information, see https://watson-cost.eu/

The ESA GTIF project started in May 2023 to build on a demonstration project for Austria extending both geographically and new capabilities for the UK, Ireland and France as one of 3 kickstarter projects. In 2025, the PI orally presented progress on the solar farm capability in the renewable energy session as well as gave an overview on the ESA stand. It is planned to hold a session with any interested EGU26 participants including a presentation of each of the 5 capabilities including a decision support webGIS tools on solar power placement focusing on raised bi-facial PV systems; PM2.5 daily mapping at 250m validated using in situ networks; drought forecasting at 10 m resolution using Sentinel-2, Landsat-TM and ERA5 inputs and validated using 1km SPEI derived from HadCM4 from the UKCEH; urban heat island mapping at 25m from Landsat and 7.5m from SDGSat-1 and methane plume detection from Sentinel-2 at 60m and from the EDA constellation. Participants will be enouraged to provide feedback on what is presented and participate in an online survey.

Update on the latest results associated to the ICDP NamCore project. Members of the scientific team and collaborators are invited to discuss scientific data, collaboration synergies and strategy for future analyses, projects and publications

Over the last decade, resilience research has expanded across scales and system levels (from individuals to communities and critical infrastructures). In parallel, disaster risk research has increasingly focused on multi-hazard and cascading risk, where hazards co-occur or interact (e.g., compound flood–heat events, successive drought–flood sequences, or earthquakes triggering landslides). Yet these two communities often remain disconnected: multi-hazard studies frequently underdevelop the concept of resilience, while resilience studies tend to centre on single hazards and rarely distinguish generic vs hazard-specific components of resilience. This splinter meeting provides a dedicated space at EGU26 to connect researchers working on resilience, multi-hazards, cascading/systemic risk, and risk governance. We will discuss (i) conceptual foundations for resilience in interconnected-hazard settings, (ii) methodological challenges (metrics, modelling, data, uncertainty, evaluation), and (iii) opportunities for collaboration across disciplines and case studies. The aim is to identify shared terminology and open research questions, and to outline concrete next steps (e.g., a community mailing list/working group, a joint paper/perspective, or a follow-up EGU session proposal).

This splinter meeting invites all interested researchers from solid Earth laboratories. We will introduce in the EPOS ERIC (European Plate Observing System) and specifially the Multi-Scale laboratories and have time for exchange with the community.

The Cerulean Information Factory (CIF) is a demonstration project funded by the European Space Agency (ESA) to develop tools and capabilities that can assist marine industries in supporting a transition to a more sustainable future (https://cif.polarview.org/). The CIF project is part of the ESA “Green Transition Information Factories” (GTIF) initiative (https://gtif.esa.int/). The CIF provides a complete ecosystem of tools for: - Information visualisation and interaction - Data access - Application development - Application execution - Data storage and management During this session, we will demonstrate how the CIF tools can provide decision support information for Arctic shipping, offshore wind energy, and aquaculture. The CIF focus region is the North Atlantic and Arctic seas between Canada and Europe. However, the CIF tools can also be used in other domains and regions, and be customized to meet specific needs.

End EGU with a trip to the theatre by joining us for the debut try-out show of The Science Storyteller: a one-hour theatre show on the fascinating science story behind Winnie the Pooh. The result of the EGU Special Activity Fund, this meeting is meant for curious-minded scientists who would like to enjoy a (children's) show at the end of a busy week of EGU and project partners of the Science Storyteller consortium to provide feedback and work on the show in anticipation of official performances at the Glasgow Science Festival and the Edinburgh Festival Fringe. In case of too much interest, note that priority access to the meeting is given to Science Storyteller consortium members. We hope you can join us for all the fun!

Update on the latest results associated to the ICDP NamCore project. Members of the scientific team and collaborators are invited to discuss scientific data, collaboration synergies and strategy for future analyses, projects and publications

Splinter meeting dedicated to the participants of the Model European Parliament for ECS (on invite only)

Policy briefs are concise, accessible documents that aim to communicate the practical implications of research to a particular policy audience and provide them with solutions to a specific issue. Although policy briefs are just one method to communicate information to a policy audience, they can be a valuable communication tool when effectively written and disseminated. This Splinter Meeting will be run in the form of an interactive workshop. Participants will be provided with tips and tools to create their own policy brief as well as interactive exercises to work on with other attendees and the session’s leaders. Participants are requested to bring along one of their (single-authored or collaborative) publications to use during the workshop. If attendees do not yet have any publications, they may bring along an article authored by someone else that they are familiar with.

Research in the Earth Sciences often has immediate implications for both individuals and society. Bringing together researchers and policymakers is thus a precondition to ensure scientific knowledge is accessible, useful and can be applied for societal progress. For this splinter meeting, we invite everyone who is, was, or would like to be involved at the interface between science and policymaking. Discussion themes will include how to create, and maintain, lasting connections between researchers and policymakers or stakeholders, and the multi-directional nature of the communication between science, policymakers, and society. The splinter meeting aims to be a follow-up discussion after EOS4.6 “Strengthening Policy Through Science: Insights from the interface” and will provide an opportunity to exchange ideas, experiences and network within the community.

End EGU with a trip to the theatre by joining us for the debut try-out show of The Science Storyteller: a one-hour theatre show on the fascinating science story behind Winnie the Pooh. The result of the EGU Special Activity Fund, this meeting is meant for curious-minded scientists who would like to enjoy a (children's) show at the end of a busy week of EGU and project partners of the Science Storyteller consortium to provide feedback and work on the show in anticipation of official performances at the Glasgow Science Festival and the Edinburgh Festival Fringe. In case of too much interest, note that priority access to the meeting is given to Science Storyteller consortium members. We hope you can join us for all the fun!

Splinter meeting dedicated to the participants of the Model European Parliament for ECS (on invite only)