Articles | Volume 21, issue 12
https://doi.org/10.5194/acp-21-9441-2021
https://doi.org/10.5194/acp-21-9441-2021
Research article
 | 
22 Jun 2021
Research article |  | 22 Jun 2021

Inter-annual variations of wet deposition in Beijing from 2014–2017: implications of below-cloud scavenging of inorganic aerosols

Baozhu Ge, Danhui Xu, Oliver Wild, Xuefeng Yao, Junhua Wang, Xueshun Chen, Qixin Tan, Xiaole Pan, and Zifa Wang

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Cited articles

Aikawa, M. and Hiraki, T.: Washout/rainout contribution in wet deposition estimated by 0.5 mm precipitation sampling/analysis, Atmos. Environ., 43, 4935–4939, 2009. 
Aikawa, M., Kajino, M., Hiraki, T., and Mukai, H.: The contribution of site to washout and rainout: Precipitation chemistry based on sample analysis from 0.5 mm precipitation increments and numerical simulation, Atmos. Environ., 95, 165–174, https://doi.org/10.1016/j.atmosenv.2014.06.015, 2014. 
Andronache, C.: Estimated variability of below-cloud aerosol removal by rainfall for observed aerosol size distributions, Atmos. Chem. Phys., 3, 131–143, https://doi.org/10.5194/acp-3-131-2003, 2003. 
Andronache, C.: Estimates of sulfate aerosol wet scavenging coefficient for locations in the Eastern United States, Atmos. Environ., 38, 795–804, https://doi.org/10.1016/j.atmosenv.2003.10.035, 2004a. 
Andronache, C.: Precipitation removal of ultrafine aerosol particles from the atmospheric boundary layer, J. Geophys. Res.-Atmos., 109, 795–804, https://doi.org/10.1016/j.atmosenv.2003.10.035, 2004b. 
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In this study, an improved sequential sampling method is developed and implemented to estimate the contribution of below-cloud and in-cloud wet deposition over four years of measurements in Beijing. We find that the contribution of below-cloud scavenging for Ca2+, SO4 2–, and NH4+ decreases from above 50 % in 2014 to below 40 % in 2017. This suggests that the Action Plan has mitigated particulate matter pollution in the surface layer and hence decreased scavenging due to the washout process.
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