The 13th International Limb Workshop will be organized by the Institute of Meteorology and Climate Research (IMKASF) of Karlsruhe Institute of Technology (KIT), Germany, the home of MIPAS, GLORIA and CAIRT. It will take place on 2-6 June 2025 in Karlsruhe Palace, in the heart of Karlsruhe City, Germany.

The workshop aims to inform the community of the status of upcoming and existing missions and their data products, bring together limb-sounding communities from Earth and planetary atmospheres, and share their latest results.

We welcome contributions from all teams involved in the development, data processing, and scientific research of atmospheric limb missions:

• Past: e.g., UARS-MLS, SAGE-II, HIRDLS, SMILES, SCIAMACHY, GOMOS, MIPAS
• Ongoing: e.g., SAGE-III/ISS, OSIRIS, OMPS-LP, ACE-FTS, Aura-MLS, MATS
• Future and Proposed: e.g., ALTIUS, ALI, CAIRT, HAWC, STRIVE, ESOTERIC, KEYSTONE.

Building on the success of the previous 12th Limb Workshop, this workshop will also include planetary limb missions (e.g., SOIR/VEx, NOMAD/TGO, OMEGA/MEx).

Solicited topics for both Earth and planetary missions include:

• Current and past limb and occultation instruments: algorithms, products, validation
• Upcoming Earth observation limb and occultation instruments
• Planetary missions: instruments and algorithms
• Atmospheric composition (Earth and planets), chemistry and transport
• Aerosols and clouds
• Gravity waves
• Applications (e.g., data assimilation, gridded products, spacecraft re-entry plumes)

Abstract submission is open until 15 March.

https://indico.scc.kit.edu/event/4811

This EPESC – LEADER Science Meeting will bring together the wider scientific community working on these two WCRP activities to share and discuss emerging topics and issues on the design and delivery of an integrated capability for quantitative observation, explanation, early warning and prediction of Earth System Change on global and regional spatial scales and annual to decadal (A2D) timescales. Both groups will share insights from analysis of large ensembles of climate model experiments to advance understanding and attribution of dynamically-driven extremes. Sessions are being planned to share the work and address the needs of each of the Working Groups.

Goals
• To bring together the full EPESC and LEADER communities for cross-working group coordination and pollination of ideas, approaches and results.
• To share progress on understanding the role of external forcing and internal variability in different regions of the world, and exchange ideas on overcoming challenges in assessing and attributing natural and anthropogenic drivers of climate hazards.
• To share research using the Large Ensemble Single Forcing Model Intercomparison Project (LESFMIP) to diagnose circulation responses to model forcing, the role of model error, and the predictability of large-scale circulations.
• To advance the vision of operationalization of decadal forecasts, and build towards the vision of an integrated capability for attribution, early warning and prediction of Earth System Change on global and regional spatial scales and annual to decadal (A2D) timescales.

In addition to presentations from the core working groups of LEADER/EPESC and ensuing discussions, the meeting will include contributed talks and posters. Should you be involved in analyses that are of relevance to EPESC and/or LEADER, or that will help inform future plans of LEADER/EPESC, please submit an abstract using this link. The abstract submission deadline is March 22, 2025. Presenters can request oral or poster formats for their presentation, and it is fine to submit multiple abstracts. We hope to send decisions on accepted abstracts within a few weeks of the closing date. Please feel free to forward this message more widely as you see fit.  

For additional details and for the form to submit your abstract, please see: https://www.wcrp-climate.org/epesc-leader-meeting2025 . The closing date is March 22nd.

As many of you probably already know, CliC is planning an open science conference in Wellington New Zealand, 9 – 12 February, 2026 (clic2026.com).  We very much hope to see many of you there and ask you to share the details with any relevant networks. 

APARC ATC Spring Meeting, 23–25 April 2025 in Graz, Austria at the Wegener Center for Climate and Global Change, University of Graz

The goal of our APARC ATC Spring meeting is to present our latest research results, to identify key science problems that we can collectively address, and to organize and contribute to community organized papers. Please fill out this form for attendance.

Second announcement and call for abstracts for the joint FISAPS – GW Symposium at Yonsei University, Seoul in June 2025

This call is purely for abstracts, and we will circulate a registration form for the meeting separately in early 2025. Please feel free to forward this message more widely as you see fit; all are welcome, and you do not need to be a formal member of either Activity to attend or present.

 We are happy to consider any abstract within the scientific remit of the GW Activity or FISAPS, whether in the area of modelling, theory, observations or other. You will be asked to specify if your abstract is closer to the area of FISAPS or GWs, but there is an option to say it is relevant to both and there will be joint sessions between the two meetings suitable for such topics. Presenters can request oral, poster or flash (up to two minutes, with slides) formats for their presentation, and it is fine to submit multiple abstracts. We hope to send decisions on accepted abstracts within a few weeks of the closing date.

 You can find a form to submit your abstract here: https://tinyurl.com/gwfiabstracts.  The closing date is Saturday 11^th of January.

An International Symposium Celebrating 35 Years of Global Atmospheric Research Enhanced by NDACC/NDSC Observations

The 2025 NDACC Symposium, hosted by Hampton University, celebrating 35 years of atmospheric research fostered by Network observations, will provide a forum to exchange information on the latest scientific achievements using NDACC and related observations, and to present NDACC’s measurement strategy for the future. We expect 150-200 scientists to participate in person, with more joining online.

Further information about the NDACC Symposium will be distributed through the ndacc.org webpage (starting in January 2025) with the abstract call coming in early spring of 2025.

Improved simulations of the stratosphere for better predictions of
weather, climate and extreme events

A joint QBOi – SNAP – QUOCA (QSQ) workshop
24-28 March 2025, Cambridge, UK

The workshop’s purpose will be to facilitate the sharing and discussion of the latest results on the role of the stratosphere in models relevant for enhancing predictability on all timescales. The workshop will serve as the in-person kick-off for the new QUOCA (QUasi-biennial oscillation and Ozone Chemistry interactions in the Atmosphere) joint QBOi-CCMI project. The aim of the workshop is to better understand stratospheric processes and variability, uncertainties, and their influence on surface climate and predictability. Free-running, initialised, and nudged simulations designed to better understand the stratospheric response to external forcings (such as climate change or geoengineering), or to improve the representation of the predictable signal in surface climate related to stratospheric processes, are also encouraged. Studies examining the potential benefits of the use of artificial intelligence are welcome.
The workshop will consist of a mixture of invited and contributed talks, posters and reports on outcomes of the latest multi-model QBOi and SNAPSI experiments employing common nudging methodologies, as well as the QBOi-ENSO and the QUOCA experiments. Breakout sessions will identify gaps in our current knowledge that can usefully inform further coordinated model experiments, and work towards community consensus on their design. Breakouts will also focus on identifying how results from current QBOi, QUOCA and SNAP research can be best used to inform model development and broader scientific activities such as future CMIP planning. To get the full benefit from active breakout discussions, the workshop will be in-person, though it is hoped limited online options will be offered.

Abstract submission is open until December 2.

For more information, please visit the workshop website: https://sites.google.com/view/qsq-workshop-mar-2025/home

The Middle Atmosphere Symposium covers all aspects of middle atmospheric science, with emphasis on the interaction between dynamics, radiation and chemistry within the middle atmosphere itself and between the middle atmosphere and the troposphere. Observational, modelling, theoretical, and laboratory studies are all solicited. Research topics include (but are not limited to): 

The first circular is here. BACO25 first circular

Abstract submission opens on October 15th. 

A joint QBOi-CCMI workshop
18-21 November, Virtual

The workshop’s purpose is to introduce the APARC community to QUOCA, a new joint QBOi–CCMI working group aimed at improving understanding of QBO-ozone feedbacks in present-day and future climates.

The workshop will consist of invited and submitted talks related to the QBO ozone feedback and will aim to summarize recent progress in this area. The workshop will run over 4 days with 3 days of talks (2.5 h on each day) and 1.5h of discussion on day 4. Times have been chosen that are friendly to two sets of time zones on each day.

Talks will help generate ideas to motivate working groups devoted to analysis of the QUOCA experiments. Studies on all aspects of QBO-ozone feedbacks – ranging from idealized modeling results to observations-based constraints – are welcome.

Registration is available here.

Improved simulations of the stratosphere for better predictions of
weather, climate and extreme events

A joint QBOi – SNAP – QUOCA (QSQ) workshop
24-28 March 2025, Cambridge, UK

The workshop’s purpose will be to facilitate the sharing and discussion of the latest results on the role of the stratosphere in models relevant for enhancing predictability on all timescales. The workshop will serve as the in-person kick-off for the new QUOCA (QUasi-biennial oscillation and Ozone Chemistry interactions in the Atmosphere) joint QBOi-CCMI project. The aim of the workshop is to better understand stratospheric processes and variability, uncertainties, and their influence on surface climate and predictability. Free-running, initialised, and nudged simulations designed to better understand the stratospheric response to external forcings (such as climate change or geoengineering), or to improve the representation of the predictable signal in surface climate related to stratospheric processes, are also encouraged. Studies examining the potential benefits of the use of artificial intelligence are welcome.
The workshop will consist of a mixture of invited and contributed talks, posters and reports on outcomes of the latest multi-model QBOi and SNAPSI experiments employing common nudging methodologies, as well as the QBOi-ENSO and the QUOCA experiments. Breakout sessions will identify gaps in our current knowledge that can usefully inform further coordinated model experiments, and work towards community consensus on their design. Breakouts will also focus on identifying how results from current QBOi, QUOCA and SNAP research can be best used to inform model development and broader scientific activities such as future CMIP planning. To get the full benefit from active breakout discussions, the workshop will be in-person, though it is hoped limited online options will be offered.

Abstract submission will open at the end of September 2024.