城市化对昆明一次强降水过程影响的数值模拟研究  

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

作　　者：郑亦佳[1,2] 刘树华[1] 何萍[3] 缪育聪[4] 王姝[5] ZHENG Yijia;LIU Shuhua;HE Ping;MIAO Yucong;WANG Shu(Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871;Zhejiang Meteorological Observatory, Hangzhou 310017;The college of Geography and Tourism Management, Chuxiong Normal University, Chuxiong 675000;Chinese Academy of Meteorological Sciences, Beijing 100081;State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems, China Electric Power Research Institute, Beijing 100192)

机构地区：[1]北京大学物理学院大气与海洋科学系,北京100871 [2]浙江省气象台,杭州310017 [3]云南楚雄师范学院地理科学与旅游管理学院,楚雄675000 [4]中国气象科学研究院,北京100081 [5]中国电力科学研究院新能源与储能运行控制国家重点实验室,北京100192

出　　处：《北京大学学报（自然科学版）》2017年第4期627-638,共12页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金(41465001);国家电网公司科技项目资助

摘　　要：为了探究昆明地区城市化对降水的影响,利用中尺度气象模式WRF(the weather research and forecasting model)耦合单层城市冠层模块,对2012年5月24日夜间发生在昆明城区西部的一次强降水过程进行数值模拟研究。通过与卫星观测得到的降水空间分布进行对比,发现WRF模式能较好地再现此次降水过程。城市的存在会较显著地改变城市地区的潜热和低层垂直运动,使得位于城区的降水中心降水强度略有减小,而城区下风向的降水有所增加,降水增加的区域与750 hPa高度上的水汽通量辐合加强的区域相对应。城区降水中心降水量减少可能是由于城市下垫面抑制了低层大气的水汽供给。城区下风向降水增加的可能原因是该区域相对较强的垂直运动使得更多的水汽被输送到高层大气中,有利于降水的增强。在目前的城市化水平上,若昆明地区的城市进一步扩张,城区下风向地区的垂直对流运动和大气不稳定度均会增强,但城市下垫面对低层水汽供给的抑制作用也会增强,这两种作用的同时存在会使得城市下风向地区降水的变化存在不确定性。A rainstorm process over west of Kunming city during the night of May24,2012is 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 at750hPa 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 also the limiting of the moisture supply in the lower atmosphere will be enhanced.The combination of these two effects will enlarge the uncertainty of precipitation over downwind area.

关 键 词：城市化 降水过程 WRF模式 

分 类 号：P426.6[天文地球—大气科学及气象学] P461