摘要
上年6月南方涛动指数(SOI)和盛夏(7-8月)我国东部季风雨带位置及江淮下游雨量存在显著的相关,经过分析,发现此种遥联是通过长达15个月的如下海-气相互作用形成的:偏强(弱)的南方涛动会伴随着赤道中-东太平洋海面水温偏低(高);此种趋势会从上年6月持续到次年初春,而同时冬季中太平洋中低纬经向海温梯度(△T)即趋向减弱(增强),向中高纬的热量输送偏少(多).△T和随后春夏各月北半球100hPa高度场和500-100hPa厚度场的相关计算表明,正高相关区从热带中太平洋区逐步向东亚中纬输送,这可能反映出高空热量经由一系列行星波西传并于盛夏抵达东亚中纬,从而影响到100hPa层青藏高压东部的伸缩、我国东部季风雨带的南北位置和江淮下游的旱涝趋势.
High positive correlation existed between the Southern Oscillation of June of the previous year and the rainfall in the central eastern China in high summer during recent 34 years. Through statistical calculation and analysis, it was found that this teleconnection is formed under a series of composite air-sea interactions in 15 months starting from the SOI of June of the previous year resulting in the modulated northward extension of next high summer monsoon rain belts in East China.
出处
《大气科学》
CSCD
北大核心
1993年第4期462-468,共7页
Chinese Journal of Atmospheric Sciences
关键词
南方涛动
季风
雨
年际遥联
Southern oscillation
The lower reaches of Changjiang and Huaihe Rivers
Monsoon rains of high summer
Interannual teleconnection.
