Numerical Simulation of Impact of Urbanization on a Precipitation Process: A Case Study of Heavy Rainfall in Kunming

ZHENG Yijia1,2, LIU Shuhua1,†, HE Ping3,†, MIAO Yucong4, WANG Shu5

ACTA Scientiarum Naturalium Universitatis Pekinensis - - Contents - ZHENG Yijia, LIU Shuhua, HE Ping, et al

1. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871; 2. Zhejiang Meteorological Observatory, Hangzhou 310017; 3. The college of Geography and Tourism Management, Chuxiong Normal University, Chuxiong 675000; 4. Chinese Academy of Meteorological Sciences, Beijing 100081; 5. State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems, China Electric Power Research Institute, Beijing 100192; † Corresponding author, E-mail: lshuhua@pku.edu.cn (LIU Shuhua), heping@cxtc.edu.cn (HE Ping)

Abstract A rainstorm process over west of Kunming city during the night of May 24, 2012 is numerically simulated to study the effect of urbanization on the precipitation by using the weather research forecasting model (WRF) numerical model with single-layer urban canopy model. It is found that the precipitation process is well simulated by comparing the spatial distribution of precipitation between the satellite observation and simulated result. The presence of the city changes the latent heat and low level vertical motion over urban area significantly, resulting in slight reduction of the precipitation intensity in the precipitation center and enhancement of the downwind precipitation. The area where precipitation increases coincides with the area where water vapor flux convergence at 750 hpa increases. The reduction of precipitation in center may be due to restraint of the moisture supply in the lower atmosphere by urban underlying. While the increase of precipitation over downwind area may result from the relatively strong vertical motion which transports more water into upper atmosphere. If the urbanization continues expansion from its current level, not only the vertical motion and atmospheric instability but

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