- TF HTAP Annual Meeting, Potsdam, Germany, 7-9 May
- Update on Emissions Inputs for HTAP3/OPNS and HTAP3/FIRES
- HTAP3 Experiment Description Papers
- CACTI Meeting, Exeter, United Kingdom, 16-18 September
1. TF HTAP Annual Meeting, Potsdam, Germany, 7-9 May
Our annual TF HTAP meeting will be held in Potsdam, Germany, May 7-9. The meeting will be in hybrid format, with online participation possible. The meeting will begin with a joint session with the LRTAP/EMEP Task Force on Measurements and Modelling (TFMM), which will be meeting in Potsdam on May 5-7.
Registration for the TF HTAP meeting can be completed here: https://eveeno.com/htap
Registration for the TFMM meeting can be completed here: https://forms.gle/Fhm7chaBuRAUS7dB9
The draft schedule for the TF HTAP meeting in Potsdam (UTC+2) is:
Wednesday, 7 May 2025
9:00 12:30 TFMM-TFHTAP Joint Session
14:00 17:00 PFAS Modelling
Thursday, 8 May 2025
9:00 16:00 Progress of HTAP3/OPNS
16:00 18:00 Progress of HTAP3/FIRES for SLCFs
Friday, 9 May 2025
9:00 12:00 Progress of HTAP3/MCHgMAP
13:30 16:00 Progress of HTAP3/FIRES (for Hg, POPS, CEC)
16:00 16:30 Recap of PFAS Session
16:30 17:30 2025-27 Work Plan and Beyond
2. Update on Emissions Inputs for HTAP3/OPNS and HTAP3/FIRES
We announced the availability of most of the emissions inputs for the OPNS and FIRES experiments through the separate discussion lists, which you can subscribe to at OPNS List and FIRES List. We are repeating that information here:
a. GAINS LRTAP future scenarios
The GAINS emissions are now available and can be downloaded here: https://doi.org/10.5281/ZENODO.14748815 Please make sure to use version 2.1 of these emissions.
The methane concentrations corresponding with these emissions have also been calculated and are available here: https://zenodo.org/records/14980850.
b. Historical biomass burning emissions
The GFAS4HTAP dataset can be downloaded here: https://doi.org/10.5281/ZENODO.13753452
We are working to create a version with the VOC speciation from GFED5, and this update will be available soon.
c. Future fire emissions
This dataset is not yet available. We will let you know when it is ready.
d. Historical anthropogenic emissions
The HTAPv3.1 emissions are available here: https://zenodo.org/records/14499440
3. HTAP3 Experiment Description Papers
The current version of the HTAP3/OPNS experiment description paper is available here: https://docs.google.com/document/d/1CYgWl2ZzrQVIbcohU9gcOSMNwCIFBmGT/. We hope to finalise this paper and submit it to GMD after the discussions in our workshop in May.
The HTAP3/FIRES experiment description paper was accepted in GMD and is undergoing typesetting. For now, you can view the accepted version here: https://docs.google.com/document/d/1lnyLv0aPPoiTg3C03H7QtpnC4YaHx3Ma/edit?usp=sharing&ouid=101627345357476448678&rtpof=true&sd=true. The previous version is available at https://gmd.copernicus.org/preprints/gmd-2024-126/. The same GMD link will provide access to the revised version when it is made available.
The HTAP3/MCHgMAP experiment description paper has been accepted for publication in a GMD/ACP/BG inter-journal special issue at https://gmd.copernicus.org/preprints/gmd-2024-65/. The special issue, “Mercury science to inform international policy: the Multi-Compartment Hg Modeling and Analysis Project (MCHgMAP) and other research,” already includes 4 articles accepted for publication and 3 articles under review.
4. CACTI Meeting, September 16-18, Exeter, United Kingdom
Composition Air quality Climate inTeractions Initiative (CACTI): Emissions to Response will hold a workshop on 16-18 September 2025, both in person at the UK Met Office (Exeter, United Kingdom) and online.
The scope of the workshop includes trace gas and aerosol composition responses to changes in natural and/or anthropogenic emission changes, air quality, radiative forcing, global and regional climate responses to emission perturbations, and climate feedbacks on trace gases and aerosols. Contributions on atmospheric composition process representation, model evaluation, as well as Earth system interactions are also in scope.
The workshop is expected to be a good opportunity to connect the HTAP3 work with other model intercomparison projects (MIPs) and community projects such as CCMI, TOAR, and Aerocom, as well as CMIP7 community MIPs such as DAMIP, GeoMIP and RFMIP. The workshop will include oral presentations, poster presentations, and there will be breakout groups to discuss plans for analysis of the CMIP7 simulations, including Fast Track and other relevant community MIPs such as AerChemMIP2.
Further information on the workshop will be forthcoming, covering details on registration, abstract submission, and practical information about travelling to the UK Met Office in Exeter. If you have questions, contact Fiona O’Connor and Steven Turnock.
Thank you for your continued contributions,
Terry, Tim, Rosa, and Jacek
The TF HTAP Leadership Team