摘要
利用近20年(1997~2017年)完整而系统的副高特征量资料,得出副高脊线与汛期降水关系最好。并对影响大连地区的副高后部降水(中到大雨以上)的环流特征进行分析,将其分为两种类型:一种是副高呈带状,即副高是纬向型分布;另一种是副高呈块状,即副高是经向型分布,在120?E^140?E范围内588线和592线形成闭合环流。根据以上两种形势特征,建立三种降水预报天气形势,即副高后部平直型、两高之间狭窄型和阻高型。
The complete character data of the Subtropical High(SH)are employed to investigate the rainfall processes(more than medium to heavy rains)caused by SH in Dalian from 1997 to 2017,and the results show that SH ridge is on good terms with the rainfall processes during flood period.According to the characteristic of atmosphere circulation and the structure of SH,there are two types of precipitation model,zonal and meridional distribution,the SH is banding in the former situation and it’s massive in the later situation with a closed circulation of the 588 hPa lines or 592 hPa lines between 120?E-140?E.Basing the two types of atmosphere circulation pattern,three types of precipitation prediction model were developed in this paper as following:straight type of the SH,straightness type between two highs and the type of Okhotsk Blocking High.
