ENSO对印度洋偶极子与中国秋季降水关系的影响  

Effects of ENSO on the Relationship between IOD and Autumn Rainfall in China

作　　者：刘宣飞[1] 袁慧珍[1] 

机构地区：[1]南京信息工程大学江苏省气象灾害重点实验室,江苏南京210044

出　　处：《南京气象学院学报》2006年第6期762-768,共7页Journal of Nanjing Institute of Meteorology

基　　金：江苏省气象灾害重点实验室资助项目(KLME060210);国家自然科学基金资助项目(40475028)

摘　　要：利用1950—1999年Hadley中心全球海温资料、NCEP/NCAR再分析资料和中国气象局整编的160站降水资料,通过讨论印度洋偶极子(IOD)独立发生时及IOD与ENSO联合发生时中国秋季降水的差异,研究了ENSO对IOD与中国秋季降水关系的影响。结果表明:仅有IOD发生时,其正位相年使得中国西南地区和黄河流域的秋季降水出现正异常,而当IOD与ENSO伴随出现时,IOD正位相年和E lN ino使得中国西南地区秋季降水正异常区域维持并向东扩展,还使得黄河流域秋季降水转为负异常。此外分析了ENSO改变IOD与中国秋季降水关系的环流成因。Based on the 1950-1999 data of Hadley Center monthly global SST,NCEP/NCAR reanalysis and rainfall over 160 stations in China, investigation is undertaken for the difference in autumn rainfall in China between years of Indian Ocean Dipole （IOD） only and IOD and ENSO concurrence, so as to study effects of ENSO on the relationship between IOD and autumn precipitation in China. It＇ s shown that the autumn rainfall will be more than normal in Southwest China and the Yellow River basin in the positive phase IOD year, however, in the positive phase IOD and ENSO concurrence year, the excessive rainfall area in Southwest China will expand eastward, while the Yellow River basin will suffer from deficit rainfall. The circulation cause is also examined for the influence of ENSO on the relationship between IOD and autumn rainfall in China.

关 键 词：印度洋偶极子 ENSO 中国秋季降水 

分 类 号：P732[天文地球—海洋科学]