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ACP - recent papers

Combined list of the recent articles of the journal Atmospheric Chemistry and Physics and the recent discussion forum Atmospheric Chemistry and Physics Discussions
  • Constraining a Radiative Transfer Model with Satellite Retrievals: Contrasts between cirrus formed via homogeneous and heterogeneous freezing and their implications for cirrus cloud thinning
    Constraining a Radiative Transfer Model with Satellite Retrievals: Contrasts between cirrus formed via homogeneous and heterogeneous freezing and their implications for cirrus cloud thinning Ehsan Erfani and David L. Mitchell Atmos. Chem. Phys., 26, 523–546, https://doi.org/10.5194/acp-26-523-2026, 2026 Cirrus clouds play a key role in Earth’s climate by trapping heat. Using satellite observations and radiative transfer modeling, we examined how thinning these clouds might help cool the planet. We find that natural homogeneous and heterogeneous cirrus have distinct radiative effects, and that the instantaneous impact of cirrus cloud thinning can lead to either cooling or warming, depending on atmospheric dynamics. These insights help guide future studies of cirrus clouds using climate models.

  • Estimation of CO2 fluxes in the cities of Zurich and Paris using the ICON-ART CTDAS inverse modelling framework
    Estimation of CO2 fluxes in the cities of Zurich and Paris using the ICON-ART CTDAS inverse modelling framework Nikolai Ponomarev, Michael Steiner, Erik Koene, Pascal Rubli, Stuart Grange, Lionel Constantin, Michel Ramonet, Leslie David, Arash Hamzehloo, Lukas Emmenegger, and Dominik Brunner Atmos. Chem. Phys., 26, 547–570, https://doi.org/10.5194/acp-26-547-2026, 2026 Urban inversions are gaining increasing attention, as cities are major contributors to anthropogenic emissions, making accurate emission estimates at this scale essential for supporting climate action plans and verifying reported emission reductions. We estimated carbon dioxide emissions in Zurich and Paris over one year by combining atmospheric observations with mesoscale model simulations. Our study shows how factors like city size, terrain, and measurement methods affect emission estimates.

  • Comment on “Thermal infrared observations of a western United States biomass burning aerosol plume” by Sorenson et al. (2024)
    Comment on “Thermal infrared observations of a western United States biomass burning aerosol plume” by Sorenson et al. (2024) Michael D. Fromm Atmos. Chem. Phys., 26, 515–522, https://doi.org/10.5194/acp-26-515-2026, 2026 Dense, fresh wildfire smoke plumes associated with longwave cooling occur day and night. The cooling is attributable to large particulate matter in the smoke, not shielding of incoming solar radiation as previously hypothesized.

  • Measurement report: New particle formation and aerosol properties at a newly founded atmospheric observatory at the Finnish Baltic Sea coast
    Measurement report: New particle formation and aerosol properties at a newly founded atmospheric observatory at the Finnish Baltic Sea coast Maija Peltola, Roseline Thakur, Kurt Spence, Janne Lampilahti, Ronja Mäkelä, Sasu Karttunen, Ekaterina Ezhova, Sami Haapanala, Aki Vähä, Juha Kangasluoma, Tommy Chan, Pauli Paasonen, Joanna Norkko, Alf Norkko, Markku Kulmala, and Mikael Ehn Atmos. Chem. Phys., 26, 489–513, https://doi.org/10.5194/acp-26-489-2026, 2026 Here, we report aerosol properties from a new atmospheric observatory established at the Finnish Baltic Sea Coast. Aerosol formation was observed when air masses crossed over the continent whereas less newly formed particles were observed when the winds were from the sea. Aerosol formation was favoured by low condensation sink and sunny dry conditions.

  • Simulating out-of-sample atmospheric transport to enable flux inversions
    Simulating out-of-sample atmospheric transport to enable flux inversions Nikhil Dadheech and Alexander J. Turner Atmos. Chem. Phys., 26, 427–441, https://doi.org/10.5194/acp-26-427-2026, 2026 We developed a generalized emulator of atmospheric transport (FootNet v3) trained over the United States, enabling the emulation of both surface & column-averaged footprints at kilometer-scale resolution. We demonstrate that FootNet v3 generalizes to previously unseen regions and meteorological conditions, enabling accurate out-of-sample simulation of atmospheric transport. Flux inversion case studies show that FootNet matches or exceeds the performance of full-physics models in unseen regions.