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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
  • Global ground-based tropospheric ozone measurements: reference data and individual site trends (2000–2022) from the TOAR-II/HEGIFTOM project
    Global ground-based tropospheric ozone measurements: reference data and individual site trends (2000–2022) from the TOAR-II/HEGIFTOM project Roeland Van Malderen, Anne M. Thompson, Debra E. Kollonige, Ryan M. Stauffer, Herman G. J. Smit, Eliane Maillard Barras, Corinne Vigouroux, Irina Petropavlovskikh, Thierry Leblanc, Valérie Thouret, Pawel Wolff, Peter Effertz, David W. Tarasick, Deniz Poyraz, Gérard Ancellet, Marie-Renée De Backer, Stéphanie Evan, Victoria Flood, Matthias M. Frey, James W. Hannigan, José L. Hernandez, Marco Iarlori, Bryan J. Johnson, Nicholas Jones, Rigel Kivi, Emmanuel Mahieu, Glen McConville, Katrin Müller, Tomoo Nagahama, Justus Notholt, Ankie Piters, Natalia Prats, Richard Querel, Dan Smale, Wolfgang Steinbrecht, Kimberly Strong, and Ralf Sussmann Atmos. Chem. Phys., 25, 7187–7225, https://doi.org10.5194/acp-25-7187-2025, 2025 Tropospheric ozone is an important greenhouse gas and is an air pollutant. The time variability of tropospheric ozone is mainly driven by anthropogenic emissions. In this paper, we study the distribution and time variability of ozone from harmonized ground-based observations from five different measurement techniques. Our findings provide clear standard references for atmospheric models and evolving tropospheric ozone satellite data for the 2000–2022 period.

  • Australian bushfire emissions result in enhanced polar stratospheric clouds
    Australian bushfire emissions result in enhanced polar stratospheric clouds Srinivasan Prasanth, Narayana Sarma Anand, Kudilil Sunilkumar, Subin Jose, Kenath Arun, Sreedharan K. Satheesh, and Krishnaswamy Krishna Moorthy Atmos. Chem. Phys., 25, 7161–7186, https://doi.org10.5194/acp-25-7161-2025, 2025 We study the impact of the 2019–2020 Australian bushfires on stratospheric chemistry and polar stratospheric cloud (PSC) dynamics. Our results show that the stratospheric intrusion of bushfire aerosols significantly increases nitric acid in the lower stratosphere, thereby increasing the PSC volume during the Austral winter. Notably, rapid ice PSC nucleation on nitric acid trihydrate particles leads to unusually high ice PSC volumes, highlighting the response of PSCs to an enhanced stratospheric aerosol scenario.

  • Enhanced emission of intermediate-volatility/semi-volatile organic matter in gas and particle phases from ship exhausts with low-sulfur fuels
    Enhanced emission of intermediate-volatility/semi-volatile organic matter in gas and particle phases from ship exhausts with low-sulfur fuels Binyu Xiao, Fan Zhang, Zeyu Liu, Yan Zhang, Rui Li, Can Wu, Xinyi Wan, Yi Wang, Yubao Chen, Yong Han, Min Cui, Libo Zhang, Yingjun Chen, and Gehui Wang Atmos. Chem. Phys., 25, 7053–7069, https://doi.org10.5194/acp-25-7053-2025, 2025 Intermediate-volatility/semi-volatile organic compounds in gas and particle phases from ship exhausts are enhanced due to the switch of fuels from low sulfur to ultra-low sulfur. The findings indicate that optimization is necessary for the forthcoming global implementation of an ultra-low-sulfur oil policy. Besides, we find that organic diagnostic markers of hopanes in conjunction with the ratio of octadecanoic to tetradecanoic could be considered potential tracers for heavy fuel oil exhausts.

  • A new parameterization of photolysis rates for oxygenated volatile organic compounds (OVOCs)
    A new parameterization of photolysis rates for oxygenated volatile organic compounds (OVOCs) Yuwen Peng, Bin Yuan, Sihang Wang, Xin Song, Zhe Peng, Wenjie Wang, Suxia Yang, Jipeng Qi, Xianjun He, Yibo Huangfu, Xiao-Bing Li, and Min Shao Atmos. Chem. Phys., 25, 7037–7052, https://doi.org10.5194/acp-25-7037-2025, 2025 A structural-based parameterization for the photolysis rates of oxygenated volatile organic compounds (OVOCs) was integrated into an updated chemical mechanism. This method links photolysis rates to species' structure, bypassing limitations of insufficient quantum yield data. Box model results show that non-HCHO OVOCs, particularly multifunctional carbonyl compounds, significantly contribute to radical production, with alkene and aromatic oxidation products playing key roles.

  • Comparative ozone production sensitivity to NOx and VOCs in Quito, Ecuador, and Santiago, Chile
    Comparative ozone production sensitivity to NOx and VOCs in Quito, Ecuador, and Santiago, Chile María Cazorla, Melissa Trujillo, Rodrigo Seguel, and Laura Gallardo Atmos. Chem. Phys., 25, 7087–7109, https://doi.org10.5194/acp-25-7087-2025, 2025 The current climate and environmental crises impose the need to take actions in cities to curb ozone as a pollutant and a climate forcer. This endeavor is challenging in understudied regions. In this work we analyze how reducing levels of precursor chemicals would affect ozone formation in Quito, Ecuador, and Santiago, Chile.