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https://doi.org/10.5194/egusphere-2024-1048
https://doi.org/10.5194/egusphere-2024-1048
22 Apr 2024
 | 22 Apr 2024

Cooling radiative forcing effect enhancement of atmospheric amines-mineral particle caused by heterogeneous uptake and oxidation

Weina Zhang, Jianhua Mai, Zhichao Fan, Yongpeng Ji, Yuemeng Ji, Guiying Li, Yanpeng Gao, and Taicheng An

Abstract. Warming radiative forced effect (RFE) derived from atmospheric amines attracts lots of attentions because of their contributions to brown carbons. Herein, the enhanced influence of amines (methyl-, dimethyl-, and trimethylamine) on cooling RFE of mineral particles is first confirmed at visible wavelengths. Present results state heterogeneous uptake and oxidation reactions of atmospheric amines are feasible on mineral particle at clean/polluted conditions, which are proofed by related thermodynamics and kinetics data obtained using combined classical molecular dynamics and density function theory methods. Based on mineral particles, simple forcing efficiency (SFE) results explain that amine uptake induces at least 11.8 % – 29.5 % enhancement on cooling RFE of amine-mineral particles at visible wavelengths. After amines’ heterogeneous oxidation, oxidized amine-mineral particles’ cooling RFE are furthermore enhanced due to increased oxygen contents. Moreover, oxidized trimethylamine-mineral particle under clean condition shows 45.6 % – 47.1 % SFE increment at 400–600 nm, which is at least 13.5 % higher than that of itself under polluted condition, due to high-oxygen-content product formation through trimethylamine autoxidation. Our results suggest cooling RFE derived from atmospheric amines can be equally important to their warming RFE on atmosphere. It is necessary to update heterogeneous oxidation mechanism and kinetics data of amines in atmospheric model in order to accurately evaluate the whole RFE caused by amines on atmosphere.

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Journal article(s) based on this preprint

19 Aug 2024
Cooling radiative forcing effect enhancement of atmospheric amines and mineral particles caused by heterogeneous uptake and oxidation
Weina Zhang, Jianhua Mai, Zhichao Fan, Yongpeng Ji, Yuemeng Ji, Guiying Li, Yanpeng Gao, and Taicheng An
Atmos. Chem. Phys., 24, 9019–9030, https://doi.org/10.5194/acp-24-9019-2024,https://doi.org/10.5194/acp-24-9019-2024, 2024
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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Previous studies show distinctive RFE of AOP-mineral mixed particles from individual mineral or...
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