北京大学学报（自然科学版）2017，Vol.53Issue(4)：627-638,12.DOI:10.13209/j.0479-8023.2016.128
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
摘要
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 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Key words
urbanization/precipitation process/WRF model分类
天文与地球科学引用本文复制引用
郑亦佳,刘树华,何萍,缪育聪,王姝..城市化对昆明一次强降水过程影响的数值模拟研究[J].北京大学学报（自然科学版）,2017,53(4):627-638,12.基金项目
国家自然科学基金(41465001)和国家电网公司科技项目资助 （41465001）
