摘要
利用常规气象资料、湖北人工气象站和自动气象监测站雨量资料、NCEP再分析0.5°×0.5°等资料,对锋生函数在2011年6月中上旬梅雨期三次暴雨过程中的作用进行了诊断分析。结果表明:(1)2011年湖北梅雨在单阻型环流场形成和维持的过程中,先后出现了三种不同特征的暴雨过程。三次过程均在中层出现锋生。(2)中层锋生主要由垂直锋生造成,有利于对流不稳定的发生。低层锋生主要由水平锋生造成,有利于水汽输送和辐合抬升。当中层和低层均有锋生,且中层为垂直锋生、低层为水平锋生时,有利于降雨强度的加强。(3)先出现中层锋生后出现低层锋生可能为短时降雨,先出现低层锋生后出现中层锋生可能为长历时降雨。(4)低层的垂直锋消与水平锋生完全抵消说明低层水平辐合不够强,且对流稳定,不利于强降雨的发生。
Using the conventional observation data,daily precipitation data of manual observation and automatic observation in Hubei Province,NCEP reanalysis data of 0.5°×0.5°,this paper analyzed the effect of frontogenesis function in three intensest rainstorm processes which occurred during the Meiyu period of Hubei Province in June 2011.The results are as follows：（1） The Meiyu process in Hubei in 2011 is of the single-blocking high type,presenting three different types of rainstorm processes,during which the frontogenesis appears in the mid level of atmosphere.（2） The frontogenesis of middle atmosphere is mainly triggered by vertical frontogenesis,which is advantageous to the convective precipitation.The frontogenesis of low level is attributed to the horizontal frontogenesis,which was helpful to convey water vapour and convergence lifting.（3） When the middle level frontogenesis occurs after the low level,there will be the long-time heavy rains when the middle level frontogenesis occurs before the low level,there will be shorttime heavy rain.（4） The vertical frontolysis in low level and the horizontal frontogenesis counteract each other,indicating that the convection in the low level is stable,and the horizontal convergence is not strong,which is not advantageous to occurrence of heavy rains.
出处
《气象》
CSCD
北大核心
2014年第1期86-93,共8页
Meteorological Monthly
基金
公益性行业(气象)科研专项(GYHY201306011)资助
关键词
锋生
梅雨期
暴雨
对比分析
frontogenesis, Meiyu period, rainstorm, contrastive analysis
