夏季贝加尔湖阻塞高压的年际变化及其与我国降水的关系

Inter-annual Change of Lake Baikal Blocking High and Its Possible Relation to Precipitation over China in Summer

采用1952—2008年NCEP/NCAR逐日500 hPa高度场再分析资料及中国国家气象中心整编的全国160站降水资料,对夏季贝加尔湖地区阻塞高压活动的年际变化特征及其同期与我国降水的可能联系进行了分析。结果表明:夏季贝加尔湖阻塞区域的阻塞活动具有明显的年际变化;在年际尺度上,夏季贝加尔湖地区阻塞活动偏多(少)对我国内蒙古东北部,华北部分地区,四川盆地与云南地区附近及广东南部的涝(旱)有一定的影响;同时对我国内蒙古中部、秦岭东北部、华北东部及川西高原的旱(涝)也有一定的影响。

Based on the NCEP /NCAR reanalysis data of 500 hPa height and precipitation of 160 stations in China during 1952-2008, the inter-annual change characteristics of Lake Baikal blocking high and its relationship with the rainfall in China in summer were analyzed. The results suggested that pronounced inter-annual variation of Baikal blocking high existed in summer. At the annual scale, more （less） blockings over Baikal Lake in summer had certain influence on floods （droughts） over the northeast of Inner Mongolia, parts of Northern China, Szechwan Basin, Yunnan and Southern Guangdong as well as over the Middle of Inner Mongolia, northeast Qinling, eastern region of North China and the West Sichuan plateau.