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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
  • Origin, transport and processing of organic aerosols at different altitudes in coastal Mediterranean urban areas
    Origin, transport and processing of organic aerosols at different altitudes in coastal Mediterranean urban areas Clara Jaén, Mireia Udina, Roy Harrison, Joan O. Grimalt, and Barend L. Van Drooge Atmos. Chem. Phys., 25, 18389–18407, https://doi.org/10.5194/acp-25-18389-2025, 2025 Distance changes air pollution in a city, but so does the time of the day and the year, due to varying emission sources and weather conditions. These changes were studied at ground level and 400 meters above the city, and showed that wood burning affected the air quality in winter, while products of atmospheric reaction processes dominated the air in summer. Traffic emissions arrive to the elevated site during the day, while they were trapped at lower level in the night.

  • Challenges and benefits of using NOx as a quantitative proxy for fossil fuel CO2 in an urban area based on radiocarbon measurements
    Challenges and benefits of using NOx as a quantitative proxy for fossil fuel CO2 in an urban area based on radiocarbon measurements Hannes Juchem, Fabian Maier, Ingeborg Levin, Armin Jordan, Denis Pöhler, Claudius Rosendahl, Julian Della Coletta, Susanne Preunkert, and Samuel Hammer Atmos. Chem. Phys., 25, 18373–18388, https://doi.org/10.5194/acp-25-18373-2025, 2025 This study explores how in situ NOx observations can be used to estimate fossil fuel CO2 (ffCO2) enhancements in an urban context, based on radiocarbon measurements. Even with a simple approach to account for atmospheric chemistry and ratio variability, a strong correlation could be observed, allowing the construction of a high temporal resolution NOx-based ffCO2 record with uncertainties comparable to the use of CO as proxy. Comparisons with independent records show good agreement between them.

  • Aviation soot interactions with natural cirrus clouds are unlikely to have a significant impact on global climate
    Aviation soot interactions with natural cirrus clouds are unlikely to have a significant impact on global climate Mattia Righi, Baptiste Testa, Christof G. Beer, Johannes Hendricks, and Zamin A. Kanji Atmos. Chem. Phys., 25, 18341–18353, https://doi.org/10.5194/acp-25-18341-2025, 2025 The effective radiative forcing due to the effect of aviation soot on natural cirrus clouds is likely very small, thus confirming most previous studies, but for the first time with the support of laboratory measurements specifically targeting aviation soot and its ice nucleation ability.

  • The critical role of oxygenated volatile organic compounds (OVOCs) in shaping photochemical O3 chemistry and control strategy in a subtropical coastal environment
    The critical role of oxygenated volatile organic compounds (OVOCs) in shaping photochemical O3 chemistry and control strategy in a subtropical coastal environment Lirong Hui, Yi Chen, Xin Feng, Hao Sun, Jia Guo, Yang Xu, Yao Chen, Penggang Zheng, Dasa Gu, and Zhe Wang Atmos. Chem. Phys., 25, 18355–18371, https://doi.org/10.5194/acp-25-18355-2025, 2025 This study finds that oxygenated organic gases play a much greater role in ozone pollution than previously known. Based on detailed air measurements and modeling, the research shows these gases strongly influence radicals and ozone formation. Overlooking them may lead to ineffective policies. The findings highlight the need for better measurement of these gases to improve pollution forecasts and support smarter air quality strategies.

  • Ethylamine-driven amination of organic particles: mechanistic insights via key intermediates identification
    Ethylamine-driven amination of organic particles: mechanistic insights via key intermediates identification Peiqi Liu, Jigang Gao, Yulong Hu, Wenhao Yuan, Zhongyue Zhou, Fei Qi, and Meirong Zeng Atmos. Chem. Phys., 25, 18313–18323, https://doi.org/10.5194/acp-25-18313-2025, 2025 This study examines ethylamine reactions with organic aerosols, showing secondary ozonides react more slowly than carboxylic acids or aldehydes, with decreasing reactivity as carbon chains lengthen. Advanced techniques revealed key intermediates (hydroxyl peroxyamines, amino hydroperoxides) and novel pathways, establishing a quantitative framework linking molecular processes to aerosol aging for atmospheric chemistry models.