ACPD Atmospheric Chemistry and Physics Discussions ACPD Atmos. Chem. Phys. Discuss. 1680-7375 Göttingen, Germany 10.5194/acpd-10-14495-2010 Spatial features of rain frequency change induced by pollution and associated aerosols Lin Yanfen 1 2 Min Qilong 1 Zhuang Guoshun 2 Wang Zuwu 3 Gong Wei 4 Li Rui 1 Atmospheric Sciences Research Center, State University of New York, USA Center for Atmospheric Chemistry Study, Department of Environmental Sciences and Engineering, Fudan University, China Department of Environmental Engineering, Wuhan University, China State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, China 10 06 2010 10 6 14495 14511 Copyright: © 2010 Yanfen Lin et al. 2010 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://acp.copernicus.org/preprints/10/14495/2010/acpd-10-14495-2010.html The full text article is available as a PDF file from https://acp.copernicus.org/preprints/10/14495/2010/acpd-10-14495-2010.pdf

A spatial-temporal analysis has been conducted using satellite observed distributions of rain frequency, NO<sub>2</sub> concentration and aerosol, with focus on the spring season. As revealed by measurements from 1998–2009 over Shanghai, China, the suppression of rain is mainly attributed to the reduction of rain occurrence rather than changes in rain intensity. The overall features emerge from the region-by-region analyses that there is an inverse relationship between the rain frequency and the pollution and associated aerosols at continental scale in spring. The enhancement of pollution-produced CCN in addition to mineral dust from long-term transport suppresses the rain frequency, as favored by topography, wind, and other meteorological conditions.

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