青藏高原东北侧夏季降水异常与澳大利亚东侧海温异常的关系研究

Correlation between the Summer Precipitation Abnormity on the Northeastern Side of Qinghai-Xizang Plateau and SSTA to East of Australia

利用青藏高原东北侧地区15个地面观测站1960—1999年逐月降水资料和全球SSTA资料,采用相关分析,发现青藏高原东北侧夏季降水与澳大利亚东侧海温存在显著而稳定的负相关关系。在此基础上选取了海温影响(165°～175°E,31°～21°S)进行分析。结果表明:青藏高原东北侧夏季降水与前一年1～3月关键海区SSTA及其分布型存在较好的对应关系,关键海区SSTA是影响青藏高原东北侧夏季降水异常的主要因子之一。

Using the month by month precipitation at 15 surface stations on the northeastern side of Qinghai-Xizang Plateau(NEQXP) from 1960 to 1999 and global SSTA data, it is firstly found that there is obvious negative correlation between the summer precipitation on the NEQXP and SSTA on the east side of Australia. Then, the sea area,165°～175°E, 31°～21°S, is key area that is the most importantSST area to the summer precipitation on the NEQTP. The result shows that there is a high correlation between precipitation in flood season on the NEQXPand SSTA average (from Jaunary to March in last year)in easternAustralia, and SSTA in key area is one of most importantfactors of the summer precipitation on the NEQXT.