The effect of typhoon Muifa on the precipitation in Liaoning province
The track,structure and cause of precipitation change of typhoon Muifa are studied with the conventional data,daily NCEP reanalysis data,automatic station data,Doppler radar data,as well as the physical characteristics are also diagnostic analyzed.The results are as follows:when the steering flow in the border of subtropical high is strong,typhoon moves along the steering flow,vice versa; the main reason why Muifa moves westerly is related to the westerly trough.The invasion of cold air at mid and low-level makes the typhoon's warm core destructed and transformed from a barotropical structure to a baroclinic one.The first influence of Muifa is originated from peripheral flow of typhoon,the vapour transportation is weaker,but the duration is long,so the accumulative total rainfall is bigger.The remained cloud system of Muifa,the warm and moist flows from southerly monsoon,peripheral flow of typhoon and the cold air are all responsible for the second stage of rainstorm.In addition,the analysis of radar data and automatic weather station data shows that the mesoscale shear and vortex play a triggering role for the development of convective system.
国家科技期刊平台
NSTL
万方数据
维普
