冬夏季热带太平洋至印度洋次表层海温变化的模态特征  

Modal characteristics of subsurface sea temperature in winter and summer over tropical Pacific-Indian ocean

作　　者：李晓婧[1] 肖天贵[1,2] 孙照渤[2] 唐毅[3] 黄金霞 

机构地区：[1]成都信息工程学院大气科学学院,四川成都610225 [2]南京信息工程大学KLME,江苏南京210044 [3]德阳市气象局,四川德阳618000 [4]广东省汕尾市气象局,广东汕尾516600

出　　处：《成都信息工程学院学报》2009年第5期496-502,共7页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(40331010)

摘　　要：采用美国Scripps海洋研究所的1955-1998年全球海洋上层海水温度月距平资料,对热带太平洋至印度洋各层海温进行经验正交函数分解,分析其主要模态特征。结果表明:热带太平洋至印度洋次表层海温场主要表现出东、西太平洋海温异常反位相变化的特征,异常强度冬季明显强于夏季。冬季赤道东太平洋40m层,东印度洋至西太平洋120m层,夏季赤道东太平洋40m层,东印度洋至西太平洋160m层为海温异常的显著区域。冬季0-60m层第一特征向量表现出厄尔尼诺(拉尼娜)模态特征,第二特征向量表现出海温异常的东西运移模态特征,80-400m层第一特征向量表现出西太平洋暖池模态特征,第二特征向量表现出海温异常的东西运移模态特征。夏季0-60m层特征向量表现出厄尔尼诺(拉尼娜)模态,80-400m层特征向量表现出西太平洋暖池模态特征。Using the global upper layer sea temperature data of the monthly mean anomalies obtained from the US Scripps Institute between 1955 and 1998 the main modal characteristics of every layer sea temperature over the tropi- cal Pacific and Indian Oceans are analyzed by the EOF method. The results show that the variability of the subsurface sea temperature anomalies are out of phase between the east and the west Pacific Ocean which are the leading charac- teristics of the subsurface sea temperature anomalies over the tropical Pacific and Indian Oceans. The anomalous in- tensity in winter is obviously stronger than that in summer. The anomalous areas remarkably in winter are equatorial eastern Pacific in the 40m level, eastern Indian and western Pacific Ocean in the 12m level. Those in summer are e- quatorial eastern Pacific in the 40m level, eastern Indian and western Pacific Ocean in the 160m level. The first eigenvector shows the modal characteristics of El Nino（La Nina） and the second eigenvector shows the modal charac- teristics of the transport and move from the east to the west Pacific Ocean of the subsurface sea temperature anomalies in 0 - 60m layer in winter. The first eigenvector shows the modal characteristics of the western Pacific Warm Pool （WPWP） and the second eigenvector shows the modal characteristics of the transport and move from the east to the west Pacific Ocean of the subsurface sea temperature anomalies in 80 - 400m layer. The eigenvectors show the modal characteristics of El Nino （La Nina） in 0 - 60m layer and western Pacific Warm Pool in 80 - 400m layer in summer.

关 键 词：热带 太平洋 次表层海温 冬夏季 

分 类 号：P462[天文地球—大气科学及气象学]