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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
  • South Asia anthropogenic ammonia emission inversion through assimilating IASI observations
    South Asia anthropogenic ammonia emission inversion through assimilating IASI observations Ji Xia, Yi Zhou, Li Fang, Yingfei Qi, Dehao Li, Hong Liao, and Jianbing Jin Atmos. Chem. Phys., 25, 7071–7086, https://doi.org10.5194/acp-25-7071-2025, 2025 This study established an ammonia emission inventory for South Asia via an assimilation-based inversion system. The posterior emissions, calculated by integrating the anthropogenic inventory and satellite observations, showed significant improvement over the prior. Validation against various measurements supports our results. The study offers a deep understanding of ammonia emissions for policymakers and researchers aiming to develop air quality management and mitigation strategies for South Asia.

  • 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.

  • 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.  

  • 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.

  • Drivers of change in peak-season surface ozone concentrations and impacts on human health over the historical period (1850–2014)
    Drivers of change in peak-season surface ozone concentrations and impacts on human health over the historical period (1850–2014) Steven T. Turnock, Dimitris Akritidis, Larry Horowitz, Mariano Mertens, Andrea Pozzer, Carly L. Reddington, Hantao Wang, Putian Zhou, and Fiona O'Connor Atmos. Chem. Phys., 25, 7111–7136, https://doi.org10.5194/acp-25-7111-2025, 2025 We assess the drivers behind changes in peak-season surface ozone concentrations and risks to human health between 1850 and 2014. Substantial increases in surface ozone have occurred over this period, resulting in an increased risk to human health, driven mainly by increases in anthropogenic NOx emissions and global CH4 concentrations. Fixing anthropogenic NOx emissions at 1850 values in the near-present-day period can eliminate the risk to human health associated with exposure to surface ozone.