Investigation of Urban Land Use Change and Aerosol Indirect Effects on Frontal Rainfall Near Coastal Regions: A 
Case Study of a Rainstorm Over the Pearl River Delta in South China

Junpeng Wen; Jing Lan*; Zhi Lin; Yi Luo; Yansong Li; Sijie Huang

doi:10.18686/ag.v9i1.14184

Investigation of Urban Land Use Change and Aerosol Indirect Effects on Frontal Rainfall Near Coastal Regions: A Case Study of a Rainstorm Over the Pearl River Delta in South China

Junpeng Wen, Jing Lan*, Zhi Lin, Yi Luo, Yansong Li, Sijie Huang

Abstract

This study investigated urban land use change (ULUC) and aerosol indirect effects on a 320 mm frontal rainstorm over the Pearl
River Delta on October 13, 2011, using the WRF-ARW model with 1992 and 2011 land use data and varied cloud condensation nuclei (CCN)
concentrations. Results showed total rainfall and intensity decreased with higher CCN, with greater suppression under high urbanization
(13.29% reduction vs. 7.91% under low urbanization) due to enhanced ice- and graupel-phase processes. ULUC increased rainfall via urban
heat/dry island effects extending the planetary boundary layer, favoring heavy rain.

Keywords

Heavy Frontal Rainstorm; Urban Land Use Change; Aerosol Indirect Effects; WRF Model; Physical Processes

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DOI: http://dx.doi.org/10.18686/ag.v9i1.14184

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