Sessions

Conveners: Robert Jnglin Wills, Hanna Joos
The session aims at discussing recent advances in atmospheric dynamics across spatial and temporal scales. We welcome submissions on the dynamics of synoptic-scale weather systems, jet streams, storm tracks, tropical overturning circulations, tropical storms, etc. as well on their interactions, e.g., between planetary-scale waves and synoptic weather events, between internal gravity waves and convection, or between different layers of the atmosphere such as troposphere-stratosphere-mesosphere coupling. Insights from recent observational campaigns are particularly welcome. Contributions could focus, for example, on interactions and feedbacks between different scales, the relative roles of atmospheric processes in driving atmospheric variability and change in models, observations, and reanalysis, or on frontier challenges in numerical modeling, data assimilation and predictability, ensemble forecasting, and future climate projection.

Conveners: Jürg Schmidli, Andreas Christen
Contributions are invited that focus on the theoretical description, experimental investigation, parameterization, and modeling of structures and processes within the atmospheric boundary layer. Particular emphasis is placed on studies that address interactions between heterogeneous and structured land surfaces and the atmosphere, mountainous terrain and the atmosphere, and turbulence within the atmospheric boundary layer. Both fundamental physical questions and applied research topics are of interest.

Conveners: Jörg Trentmann, Martin Wild
Aerosols and clouds and their interactions with each other significantly influence the solar and terrestrial radiation budget and thus the climate of our planet. This session welcomes contributions from the various fields of cloud, aerosol and radiation research: methods and results of ground measurements, ground- and satellite-based remote sensing or model calculations; studies on spatial and temporal variability on different scales (local to global, high-frequency to climatological); investigations on the interactions between aerosols, clouds and radiation, as well as on the radiation and energy balance of the atmosphere.

Conveners: Michaela Hegglin, Stefan Brönnimann
The session invites contributions on all aspects of atmospheric chemistry, ranging from gas phase chemistry to aerosols and reporting laboratory work, field experiments, long-term monitoring, or modeling. Contributions on all layers of the atmosphere, from the boundary layer to the stratosphere, and all pollution regimes are welcome. We also encourage contributions on the interaction with clouds and radiation.

Conveners: Alexis Berne, Heike Kalesse-Los, Nikolina Ban
This session is focused on the meteorology of the polar and high altitude regions. This encompasses all atmospheric processes involved in the weather and climate of those regions, including the interactions with the ocean/land surface and the cryosphere. Relevant atmospheric processes and their effect on adjacent components involve the atmospheric boundary layer, clouds, precipitation, radiation, local dynamics, large scale circulation, orographic lifting, the polar vortex, tropospheric-stratospheric interaction, and others. Contributions may focus on model simulations and/or observations (in situ and remote sensing) from fixed stations or dedicated field campaigns/expeditions.

Conveners: Thomas Frölicher, Niki Gruber
This session will explore advancements in oceanography across a wide range of spatial and temporal scales. We invite contributions that assess all facets of ocean circulation and dynamics through observations, modeling, and theoretical approaches. Topics may range from microscale turbulence to global processes, spanning timescales from seconds to millennia, and covering regions from the tropics to polar oceans. Submissions related to the global energy budget and studies on the interactions between small-scale turbulence and larger oceanic processes are encouraged. A particular emphasis will be placed on ocean extreme events, such as marine heatwaves, their driving processes, and their far-reaching implications. We also encourage submissions discussing the unprecedented record-breaking warm ocean temperatures in 2023 and 2024, and their impacts on global weather systems and extremes.

Conveners: Sebastian Wagner, Kira Rehfeld
The session invites contributions from the field of paleoclimate reconstructions, ranging from short time scales of individual historical extreme events to long term changes, including glacial-interglacial cycles and beyond. Also contributions from different spatially aggregated scales addressing local, regional, continental and global historical weather and climate phenomena are welcome. Especially appreciated are papers with novel methodological and conceptual ideas, presenting innovative avenues in linking the different spatial and temporal scales and integrating different proxy and archaeological archives with modelling studies.

Conveners: Christian Steger, Theresa Schellander-Gorgas, Robert Jnglin Wills
In this session, insights into climate variability and changes on all temporal and spatial scales can be presented. A focus is on findings about potential future changes in the climate system derived from global, regional and convection permitting climate simulations, both for Europe and the D-A-CH region as well as for other regions of the globe. We also welcome submissions on dynamical model, statistical downscaling, or machine learning developments focused on improving climate projections and on applications of results derived from climate projections for use by practitioners or in policy consultancy. Contributions on climate model evaluation, for example quality control measures/frameworks for climate models/simulations or climate data in general, can also be submitted to this session.

Conveners: Stephanie Hänsel, Tobias Geiger
Extreme meteorological and climatological events affect societies, economies and environments in unprecedented ways. Therefore, the provision and communication of weather and climate risks and associated impacts for is of great importance for forecast user communities, decision-makers (such as civil protection etc.) and the public. The ultimate goal of these activities are to trigger preventive actions, minimize fatalities and losses, improve resilience and boost adaptation and mitigation measures. User engagement, co-design and stakeholder management are important prerequisites to develop successful operational products and services. This session therefore aims to assemble relevant actors and findings from all involved parties and disciplines at the interface of weather and climate risks and impact-based services. It seamlessly unites natural and social sciences to make the best use of risk and impact information for citizens and society.

Conveners: Martin Weissmann, David Leutwyler
This session aims to explore recent advancements and challenges in numerical weather prediction (NWP), nowcasting, and the use of high-performance-computing in the context of weather forecasting. We welcome contributions that focus on improving NWP models, data assimilation techniques, and ensemble forecasting methods, particularly on the convective scale, and submissions that integrate innovative observational data into NWP and nowcasting systems.  Additionally, we invite contributions on new forecasting approaches enabled by advances in high-performance computing (HPC) capabilities, as well as discussions on challenges faced by traditional NWP systems due to evolving the HPC infrastructures.

Conveners: Ana Vicedo, Annelie Holzkämper
Climate variability and climate change affect biological and socio-economic processes and the interactions between them at multiple temporal and spatial scales. As climate change progresses, threats to the living world aggravate (e.g., species habitats deteriorate or shift, phenological cycles change, agricultural productivity reduces, increased mortality and morbidity). In this session, we welcome contributions that investigate the complex interconnectedness between atmospheric, biological and socio-economic processes. Studies may explore impacts of historic and/or projected climate change with the aim of informing effective strategies for climate adaptation and mitigation.

Conveners: Daniel Fenner, Moritz Burger, Brigitta Hollosi
Urbanization remains a significant process across the DACH region and beyond. Official statistics indicate a continuing increase in urban populations across all three DACH countries, with more than 75 % of the population living in urban areas. In this session, we aim to discuss the complex interactions between urban environments, climate (change), and (micro-) meteorology, highlighting the dual role of cities as both important contributors to climate change and as areas particularly vulnerable to its impacts, such as extreme weather events. We welcome contributions on observational methods (e.g. field campaigns, measurement networks, remote sensing, drone-based), numerical modeling and simulations as well as research on mitigation and impact assessments, covering short-term investigations to long-term studies. The session is furthermore open to projects examining the interplay of cities and human health. Contributions involving opportunistic data such as crowdsourced data, machine-learning/artificial intelligence, or citizen science approaches in the context of urban regions are also encouraged.

Conveners: Christian Grams, Marion Schroedter-Homscheidt, Irene Schicker
The deployment of renewables, in particular wind and solar power, rapidly increases in Germany, Austria, Switzerland, and world-wide. Together with the electrification of transport and heating, the connected European energy system is becoming more and more weather-dependent. This requires seamless weather and climate data for the planning, operation, and climate change adaptation of the future energy system. This session invites contributions from all aspects of energy meteorology, for example: (ML-) approaches generating high-resolution data for assessing wind and solar potential blending observational, satellite, and numerical model data; Ensemble forecasting of power output across scales; Spatio-temporal variability of renewables; Impact of long-term climate change on power systems, Practical experience and examples using meteorological information in energy applications.

Conveners: Céline Portenier, Anke Tetzlaff
This session focuses on the latest developments in remote sensing technologies and their applications within meteorology and climatology. It brings together researchers and practitioners to share innovative methods, new data products and practical applications resulting from satellites, UAVs, and ground-based remote sensing technologies such as weather radars, lidar systems and camera networks. The session examines how these tools are transforming our understanding of atmospheric processes, climate variability, and extreme weather events. Topics include remote sensing applications in atmospheric dynamics and composition monitoring, cloud formation and dynamics, climate change analyses, radiation and energy balance studies, and urban and microclimate monitoring. The session will also highlight recent advancements in extreme weather monitoring, such as the detection and tracking of severe storms, fog, and rapidly changing visibility conditions. Emphasizing data integration, the session will address the practical challenges of combining multi-sensor observations to improve weather forecasting accuracy and gaining new insights into climate trends.

Conveners: Tom Beucler, Monika Feldmann
Taking stock of the transformative effect of machine learning (ML) on Earth system modeling and geodata analysis, this session focuses on advances in data-driven weather and climate modeling across spatial and temporal scales. We welcome contributions on a wide range of related topics, including AI-based weather forecasting tools, climate analysis through data-driven methods, and super-resolution algorithms for downscaling. Key challenges of interest include causal discovery and inference, learning equations and processes from data, hybrid physics-ML models, and novel techniques for detecting and attributing extreme events. Submissions on uncertainty quantification (e.g., probabilistic forecasting and stochastic modeling), explainable AI, robustness, transfer learning, automatic model calibration, and the adoption of data-driven weather modeling tools are also encouraged.

Conveners: Michiko Hama, Andreas Gobiet, Daniela Jacob

This session highlights the expanding role of climate services in supporting adaptation, risk management, and decision-making across sectors. We welcome contributions that examine how climate services can effectively deliver relevant and actionable climate information to a variety of end-users, including public institutions, private organizations, and communities. Key topics include:

• Methods for the development of relevant and actionable climate services, based on complex climate data, addressing challenges in communicating uncertainty and limitations of climate information.
• Development and governance of climate services at regional, national and international levels, including the role of national weather services and collaborative efforts like Copernicus and the Global Framework for Climate Services.
• Examples of climate services in action: successes and lessons learned
• Mechanisms for sustainable partnerships between climate researchers, service providers, and end-users.

Contributions reflecting on the co-development of climate services with end-users to enhance relevance and accessibility are especially encouraged.

Conveners: Stefanie Falk, Christian von Savigny
This session is a joint session between the environmental physics division of the German Physical Society (DPG) and the meteorological societies of Austria, Germany and Switzerland (DACH). A main objective of the session is to provide a forum for discussions between members of the different societies, as the research interests of the different disciplines often have significant overlap. In environmental physics, physics provides the tools and methods to study the various spheres of the environment. The main topical foci will be on atmosphere and climate, but contributions on other environmental physics subdisciplines are welcome as well.