Variations in the eastern Indian Ocean warm pool and its relation to the dipole in the tropical Indian Ocean  

作　　者：张启龙 侯一筠 齐庆华 白学志 

机构地区：[1]Institute of Oceanology,Chinese Academy of Sciences [2]Key Laboratory of Ocean Circulation and Waves(KLOCAW),Chinese Academy of Sciences [3]The Graduate School of Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2009年第3期640-649,共10页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Key Basic Research Development Program of China (973 Program)(No 2006CB403606);the Knowledge Innovation Program of Chinese Academy of Sciences (KZCX1-YW-12);the National Natural Science Foundation of China (No 40306006)

摘　　要：Based on the monthly average SST and 850 hPa monthly average wind data,the seasonal,interannual and long-term variations in the eastern Indian Ocean warm pool(EIWP) and its relationship to the Indian Ocean Dipole(IOD),and its response to the wind over the Indian Ocean are analyzed in this study.The results show that the distribution range,boundary and area of the EIWP exhibited obviously seasonal and interannual variations associated with the ENSO cycles.Further analysis suggests that the EIWP had obvious long-term trend in its bound edge and area,which indicated the EIWP migrated westwards by about 14 longitudes for its west edge,southwards by about 5 latitudes for its south edge and increased by 3.52×106 km2 for its area,respectively,from 1950 to 2002.The correlation and composite analyses show that the anomalous westward and northward displacements of the EIWP caused by the easterly wind anomaly and the southerly wind anomaly over the eastern equatorial Indian Ocean played an important and direct role in the formation of the IOD.Based on the monthly average SST and 850 hPa monthly average wind data, the seasonal, interannual and long-term variations in the eastern Indian Ocean warm pool （EIWP） and its relationship to the Indian Ocean Dipole （IOD）, and its response to the wind over the Indian Ocean are analyzed in this study. The results show that the distribution range, boundary and area of the EIWP exhibited obviously seasonal and interannual variations associated with the ENSO cycles. Further analysis suggests that the EIWP had obvious long-term trend in its bound edge and area, which indicated the EIWP migrated westwards by about 14 longitudes for its west edge, southwards by about 5 latitudes for its south edge and increased by 3.52×10^6km^2 for its area, respectively, from 1950 to 2002. The correlation and composite analyses show that the anomalous westward and northward displacements of the EIWP caused by the easterly wind anomaly and the southerly wind anomaly over the eastern equatorial Indian Ocean played an important and direct role in the formation of the IOD.

关 键 词：the Indian Ocean warm pool ENSO DIPOLE 

分 类 号：P732[天文地球—海洋科学]