淮河流域夏季降水异常与北太平洋海温异常的关系  

Relationship between Summer Precipitation Anomalies in the Huaihe Basin and SSTA over the North Pacific

作　　者：王 慧[1] 王谦谦[1] 

机构地区：[1]南京气象学院大气科学系,江苏南京210044

出　　处：《南京气象学院学报》2002年第1期45-54,共10页Journal of Nanjing Institute of Meteorology

基　　金：国家重点基础研究发展规划项目"我国重大气侯灾害的形成机理和预测理论研究"(1998040900);国家自然科学基金重点项目"中国区域气候变化分析和机理研究"(49735170)

摘　　要：研究淮河流域降水异常与北太平洋海温异常的相关关系,初步探讨北太平洋海温异常对淮河流域降水的可能影响机制.结果表明:淮河流域夏季降水与上年8-10月北太平洋中部关键海区(162.5～177.5°W,36.5～41.5°N)的SSTA存在持续高的正相关关系;淮河流域夏季降水异常对应着一种大范围的海温异常分布型,而关键海区正好位于其相关最显著地区;正是由于北太平洋大范围持续的海温异常引起了次年夏季大气环流的异常,导致了淮河流域夏季降水异常,这也正是海温与降水具有很好相关的内在原因.The relationship between summer precipitation anomalies in the Huaihe Basin and SSTA over the North Pacific is researched in this paper. Possible mechanisms of the effects of SSTA over the North Pacific on summer precipitation anomalies in the Huaihe Basin are primarily discussed. The main results may be concluded as follows; (1) The key area of SSTA over the North Pacific locates in 162.5~177.5癢, 36.5~41.5癗 in which the mean SSTA from the preceding August to October has the largest positive correlation with the summer precipitation in the Huaihe Basin. (2) By the use of the SVD analysis technique,it is found that summer precipitation anomalies in the Huaihe Basin correspond to a large scale SSTA distribution pattern over the North Pacific and the key SSTA area is just located in the center. (3) It is the circulation anomalies in the following summer induced by the large area SSTA distribution pattern over the North Pacific that result in the summer precipitation anomaly in the Huaihe Basin. It is also the inner cause of the good correlation between the precipitation and the SSTA.

关 键 词：淮河流域 降水异常 北太平洋海温异常分布型 环流异常 SVD分析 夏季 

分 类 号：P461.2[天文地球—大气科学及气象学]