SVD揭示的印度洋海气相互作用模态及其与中国降水的联系
投稿时间:2005-11-10  修订日期:2006-06-12  点此下载全文
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作者单位
王桂臣 南京信息工程大学, 大气科学学院, 江苏, 南京, 210044 
管兆勇 南京信息工程大学, 大气科学学院, 江苏, 南京, 210044
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 
基金项目:国家自然科学基金资助项目(40475028);国家重点基础研究发展计划项目(2006CB403602);江苏省六大人才高峰项目
中文摘要:利用1958-1999年6-8月平均的GISST(Global Indian Sea Surface Temperature)海表温度资料和同期850 hPa水平风场等NCEP/NCAR再分析资料,作了向量奇异值分解,并对各个模态作了相应分析,发现前两个模态可以很好地表示出印度洋海气耦合的主要部分:第1模态是印度洋海温对ENSO信号的滞后响应;第2模态反映了存在于印度洋的海-气相互作用现象,是ENSO和IOD(Indian Ocean Dipole,印度洋偶极子)的混合模态。讨论了前两个模态与中国夏季降水等变化的联系,发现印度洋海温单极模态与我国华南夏季降水存在负相关,与长江流域及其以北地区存在正相关;印度洋偶极型海温与我国降水的关系不典型。
中文关键词:印度洋偶极子(IOD)  ENSO  热带大气环流异常
 
Modes of Air-sea Interactions in the Indian Ocean and Their Relationships with the Rainfall ower China as Revaled by SVD Analysis
Abstract:Using the summertime(JJA) sea surface temperature from GISST data and the wind at 850hPa from the NCEP/NCAR reanalysis data during 1958 to 1999,we analyse the air-sea interactions over the Indian Ocean with the SVD method.Our results demonstrate that the two leading SVD modes explain large parts of the Indian Ocean-atmosphere coupled variabilities.The first mode(SVD1) displays the one-year-lag response of the Indian Ocean to El Nino in Pacific.However,the second mode(SVD2) exhibits the air-sea coupled phenomenon characterized with a dipolar pattern in Indian Ocean.We also discuss the relationships of these two modes(SVD1 and SVD2) with the summertime climate variations in China.The negative correlations have been observed between the mono-polar mode in the Indian Ocean SSTA and the summertime rainfall in southern China,while the positive correlations have been observed between the SVD1 and the rainfall in Changjiang River region.The correlation of the dipolar SSTA in the Indian Ocean as resprented by SVD2 and the rainfall of China is not evident.
keywords:Indian Ocean Dipole(IOD)  ENSO  anomalous of the tropical atmospheric circulation
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