临夏地区对流天气过程环流分型

Classification of Convection Processes With Circumfluence Types in Linxia Area

利用2005—2014年临夏地区永靖、东乡、广河、和政、康乐5个气象站雷暴观测资料,从10年的观测资料中,挑选出了213个雷暴记录。由于所选站点比较集中,一个站点发生雷暴就认为该地区有发生对流。根据雷暴发生个例,逐个查看2005—2014年5—9月MICAPS 8:00、20:00的500 h Pa高度场,将对流天气过程进行划分,得到了临夏地区对流天气的主要环流形势为:槽后西北气流型、横槽型、槽过境型、低涡后部型。其中,最有利于临夏地区发生对流的天气型是槽后西北气流型或横槽型,其次是槽过境型。

By using the data of 5 meteorological stations in Linxia area,including Yongjing,Dongxiang,Guanghe,Hezheng and Kangle,during 2005-2014,213 thunderstorms cases were selected. Because those 5 stations are relative nearly from each other,when thunderstorms occur at one station,it can be considered convection occurs in Linxia area. According to the 213 thunderstorm cases ,the maps of MICAPS from May to September during 2005-2014 at 8：00 and 20：00 on 500 hPa height field were researched, and finally the weather type of convection occurred in Linxia area were concluded ,which could be divided into 4 kinds,including northwest flow type ,horizontal groove type ,slot passage type and vortex type. The most advantage weather type of convection occurred in Linxia area was northwest flow twe or horizontal groove type, followed by slot passage type.