EGUsphere EGUsphere EGUsphere EGUsphere Copernicus Publications Göttingen, Germany 10.5194/egusphere-2025-3057 Introducing Volatile Organic Compound Model Intercomparison Project (VOCMIP) Myhre Gunnar https://orcid.org/0000-0002-4309-476X 1 Hodnebrog Øivind https://orcid.org/0000-0001-5233-8992 1 Krishnan Srinath 1 Sand Maria https://orcid.org/0000-0003-0256-7468 1 Sandstad Marit 1 Skeie Ragnhild B. https://orcid.org/0000-0003-1246-4446 1 Clarisse Lieven https://orcid.org/0000-0002-8805-2141 2 Franco Bruno https://orcid.org/0000-0003-0736-458X 2 Millet Dylan B. https://orcid.org/0000-0003-3076-125X 3 Wells Kelley C. https://orcid.org/0000-0003-3025-6878 3 Archibald Alexander https://orcid.org/0000-0001-9302-4180 4 5 Bryant Hannah N. https://orcid.org/0009-0009-9380-8298 6 Chaudhri Alex T. 6 Stevenson David S. https://orcid.org/0000-0002-4745-5673 6 Hauglustaine Didier https://orcid.org/0000-0002-4826-5118 7 Prather Michael https://orcid.org/0000-0002-9442-8109 8 Kaiser J. Christopher https://orcid.org/0000-0002-1578-9142 9 Olivie Dirk J. L. 10 Schulz Michael https://orcid.org/0000-0003-4493-4158 10 Wild Oliver https://orcid.org/0000-0002-6227-7035 11 Wang Ye 11 Salameh Thérèse https://orcid.org/0000-0002-1490-169X 12 Williams Jason E. 13 Le Sager Philippe 13 Paulot Fabien https://orcid.org/0000-0001-7534-4922 14 Tsigaridis Kostas https://orcid.org/0000-0001-5328-819X 15 16 Plaas Haley E. 15 16 CICERO Center for International Climate Research, 0318 Oslo, Norway Spectroscopy, Quantum Chemistry and Atmospheric Remote Sensing (SQUARES), BLU‐ULB Research Centre, Université Libre de Bruxelles (ULB), 1050 Brussels, Belgium University of Minnesota, St. Paul, MN, 55108, USA Yusuf Hamied Department of Chemistry, University of Cambridge, UK National Centre for Atmospheric Science, UK School of GeoSciences, The University of Edinburgh, EH9 3FF, UK Laboratoire des Sciences du Climat et de l’Environnement (LSCE), CEA/CNRS/UVSQ, IPSL, Université Paris-Saclay, Gif-sur-Yvette, France Earth System Science Department, University of California Irvine, Irvine, CA, USA Deutsches Zentrum für Luft- und Raumfahrt, Institut für Physik der Atmosphäre, Oberpfaffenhofen, Germany Norwegian Meteorological Institute, Oslo, Norway Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK IMT Nord Europe, Institut Mines-Télécom, Univ. Lille, Centre for Energy and Environment, F-59000, Lille -France R&D Weather and Climate Modeling, Royal Netherlands Meteorological Institute, De Bilt, the Netherlands NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, USA Center for Climate Systems Research, Columbia University, New York, NY, USA NASA Goddard Institute for Space Studies, New York, NY, USA 10 09 2025 2025 1 18 Copyright: © 2025 Gunnar Myhre et al. 2025 This work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ This article is available from https://egusphere.copernicus.org/preprints/2025/egusphere-2025-3057/ The full text article is available as a PDF file from https://egusphere.copernicus.org/preprints/2025/egusphere-2025-3057/egusphere-2025-3057.pdf

Volatile organic compounds (VOCs) play an important role in atmospheric chemistry, influencing the cycling of peroxy and hydroxyl radicals, the formation of tropospheric ozone, hydrogen, secondary organic aerosol, and the lifetime of methane and other greenhouse gases. Their interactions shape overall atmospheric composition and air quality, with implications for both climate and human health. Given their significance, accurate representation of VOCs in global atmospheric chemistry models is crucial. In this context, we introduce the Volatile Organic Compound Model Intercomparison Project (VOCMIP) and invite atmospheric chemistry modelling groups to participate in this collaborative effort. VOCMIP aims to identify model consistencies and discrepancies, enhance the formulation of chemical mechanisms, and advance our understanding of VOC-related processes in the atmosphere. Global atmospheric chemistry model output will be compared to <em>in situ</em> measurements from surface stations and aircraft campaigns, plus satellite data for key VOCs. Special emphasis will be placed on formaldehyde (HCHO), examining its chemical sources and sinks given its central role as a radical source and as an intermediate in the photochemical destruction of VOCs.

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