Articles | Volume 23, issue 13
https://doi.org/10.5194/acp-23-7521-2023
https://doi.org/10.5194/acp-23-7521-2023
Research article
 | 
11 Jul 2023
Research article |  | 11 Jul 2023

The variation in the particle number size distribution during the rainfall: wet scavenging and air mass changing

Guangdong Niu, Ximeng Qi, Liangduo Chen, Lian Xue, Shiyi Lai, Xin Huang, Jiaping Wang, Xuguang Chi, Wei Nie, Veli-Matti Kerminen, Tuukka Petäjä, Markku Kulmala, and Aijun Ding

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Cited articles

Andronache, C., Grönholm, T., Laakso, L., Phillips, V., and Venäläinen, A.: Scavenging of ultrafine particles by rainfall at a boreal site: observations and model estimations, Atmos. Chem. Phys., 6, 4739–4754, https://doi.org/10.5194/acp-6-4739-2006, 2006. 
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Bae, S. Y., Jung, C. H., and Kim, Y. P.: Derivation and verification of an aerosol dynamics expression for the below-cloud scavenging process using the moment method, J. Aerosol Sci., 41, 266–280, https://doi.org/10.1016/j.jaerosci.2009.11.006, 2010. 
Blanco-Alegre, C., Castro, A., Calvo, A. I., Oduber, F., Alonso-Blanco, E., Fernández-González, D., Valencia-Barrera, R. M., Vega-Maray, A. M., and Fraile, R.: Below-cloud scavenging of fine and coarse aerosol particles by rain: The role of raindrop size, Q. J. Roy. Meteor. Soc., 144, 2715–2726, https://doi.org/10.1002/qj.3399, 2018. 
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The reported below-cloud wet-scavenging coefficients (BWSCs) are much higher than theoretical data, but the reason remains unclear. Based on long-term observation, we find that air mass changing during rainfall events causes the overestimation of BWSCs. Thus, the discrepancy in BWSCs between observation and theory is not as large as currently believed. To obtain reasonable BWSCs and parameterizations from field observations, the effect of air mass changes needs to be considered.
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