气象2017，Vol.43Issue(2)：181-188,8.DOI:10.7519/j.issn.1000-0526.2017.02.005
黄山地区短时强降雨的地形增幅机制
The Topograpical Enhancement Mechanism of Short-Time Heavy Rainfall in Huangshan Mountain
摘要
Abstract
The spatio-temporal distribution of short-time heavy rainfall in Huangshan Mountain region was analyzed statistically by using the observations from 191 ground automatic observation stations in Huang-shan Mountain region.Statistics revealed that the frequency of short-time severe rainfall process increases significantly from afternoon to evening (14:00-18:00)period;short-time severe rainfall occurs most of-ten in Huangshan Mountain and the nearby area;the distribution of short-term heavy rainfall frequency is highly correlated with mountain shape and terrain.Using three typical cases,the function of the enhance-ment of mountain terrain dynamic blocking and thermodynamics in short-time severe rainfall is analyzed. The findings are concluded as follows:(1 )The rainfall increases due to the lifting rate of mountain terrain on the windward slope,and the rainfall coulds reach 60% according to the diagnosis by the water vapor budget method.(2)When the frontal surface passes the mountain area,its vertical disturbance enhances frontogenesis,while in the leeward slope,the surface vortex,and ascending motion are enhanced,result-ing in the increase in precipitation.(3 )In the southwest region thermal low forms due to the difference of surface latent heat flux,making this area warmer and wetter and the atmospheric instability enhanced. Affected by cold advection,severe convective weather develops,thus increasing the precipitation in the mountain region.关键词
黄山山脉/短时强降雨/地形抬升/锋生/热低压Key words
Huangshan Mountain/short-time severe rainfall/topographic uplift/frontogenesis/thermal low分类
天文与地球科学引用本文复制引用
刘裕禄,杜其成,黄勇..黄山地区短时强降雨的地形增幅机制[J].气象,2017,43(2):181-188,8.基金项目
安徽省自然科学基金项目(1508085MD64)、中国气象局(CMAGJ2015M28)和公益性行业(气象)科研专项(GYHY201306040)共同资助 （1508085MD64）
