辽宁春季透雨的环流背景及与海温相关分析

利用1961—2008年4—5月辽宁14个站逐日降水资料,分析了春季第一场透雨出现日期与500 hPa的环流背景及海温的相关关系。结果表明：中国辽宁春季透雨出现日期与前一年9—11月500 hPa高度场有较好的相关性,与北半球同年4月500 hPa环流年代际变化有较好的对应关系;透雨出现日期与北太平洋前期海温呈显著的负相关,当北太平洋地区前期海温偏高时,中国辽宁春季透雨出现日期偏早;当北太平洋地区前期海温偏低时,中国辽宁春季透雨出现日期偏迟。

Circulation background of spring soaking rain and its correlation with sea surface temperature in Liaoning province

Based on the daily precipitation data at 14 weather stations during April to May from 1961 to 2008 in Liaoning province,the correlations between the beginning date of the first spring soaking rain and circulation background at 500 hPa as well as sea surface temperature（SST） were analyzed.The results indicate that the date of the first spring soaking rain in Liaoning province has a good correlation with the height field at 500 hPa during September to November last year,and it is of corresponding relation with inter-decadal variations of circulation on the north hemisphere in April of the same year.The date of the first spring soaking rain in Liaoning province is in a significantly negative correlation with the prophase SST in the North Pacific Ocean.The date of the first spring soaking rain occurs early when the prophase SST is high in the North Pacific Ocean,while it delays when the prophase SST is low.