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气象:2006,32(11):88-93
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100hPa环流特征与2005年梅雨异常的关系
(国家气象中心,北京 100081)
Relationship Between 100hPa Circulation and Meiyu Anomaly in 2005
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投稿时间:2006-08-22    修订日期:2006-09-28
中文摘要: 2005年7月5日入梅,7月14日出梅,入梅晚,梅雨期短,梅雨量少,致使我国主要雨带位置不是如常年一样维持在江淮流域,而是在江南地区南部和华南地区。使用NCEP再分析资料,分析了100hPa环流特征与梅雨异常的关系。结果表明,6月份江南地区南部和华南地区多雨时期,100hPa南亚高压中心基本停留在青藏高原南部地区上空,120°E上脊线位置大致在21~26°N之间摆动,较常年同期明显偏南。7月份,高压中心位置北抬,但不够稳定;120°E上脊线位置较6月份略偏北。6—7月期间,120°E上的100hPa南亚高压脊线位置比500hPa西北太平洋高压脊线位置基本偏北5个纬度左右,100hPa南亚高压东段脊线与500hPa副高脊线南北摆动趋势一致,100hPa南亚高压东段脊线北侧附近地区相应是暴雨区位置。
Abstract:There existed the characteristics of short period and less rainfall during the Meiyu in 2005,which made the main rainband occur in the Jiangnan area and South China.The relationship between the 100hPa circulation and Meiyu is analyzed based on the NCEP /NCAR reanalysis datasets in 2005.The results show that the center of 100hPa South Asia high stayed over the south of the Qinghai Tibetan Plateau in June,the ridge position at 120°E was located in 21—26°N,it is obvious that the ridge position is southerly in June.The center of South Asia high moved northward in July.During June to July,the ridge position of the 100hPa South Asia high at 120°E is northerly by five latitude degrees or so more than that of the northwest Pacific subtropic high.Both east ridge position of the 100hPa South Asia high and the ridge of the 500hPa subtropic high move northward and southward synchronously,while the north of east ridge position of 100hPa South Asia high corresponds the place where the heavy rain occurs.
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引用文本:
王秀文,桂海林,2006.100hPa环流特征与2005年梅雨异常的关系[J].气象,32(11):88-93.
,2006.Relationship Between 100hPa Circulation and Meiyu Anomaly in 2005[J].Meteor Mon,32(11):88-93.