Hydrography and Circulation in the Eastern Tropical Indian Ocean during April-May 2011  

作　　者：XUAN Li-Li QIU Yun XU Jin-Dian HE Yun-Kai 

机构地区：[1]Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China [2]State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, The Chinese Academy of Sciences,Guangzhou 510301, China

出　　处：《Atmospheric and Oceanic Science Letters》2012年第4期284-289,共6页大气和海洋科学快报（英文版）

基　　金：supported by the Ocean Public Welfare Scientific Research Project,State Oceanic Administration(Grant No.201005033-4);Comprehensive Fields Experiments of Oceanology in Indian Ocean in 2011(Grant No.41049903);the National Natural Science Foundation of China(Grant No.40806014);the National Basic Research Program of China(Grant Nos.2009CB421205 and 2011CB403502)

摘　　要：The distribution of hydrography and circulation in the eastern tropical Indian Ocean(ETIO) during April-May 2011 were analyzed using cruise observations,satellite observations,and historic hydrographic data.It was observed that warm water(>28℃) occupies the upper 50-m layer in the ETIO.Low-salinity surface water was observed at the mouth of the Bay of Bengal(BOB),which further extends to the Arabian Sea and off Sumatra via the Sri Lanka coast and the eastern bay mouth.Arabian Sea high-salinity water(ASHSW) is carried eastward along the equator to around 90°E by the equatorial undercurrent(EUC).It also runs south of Sri Lanka(north to 3°N) and in the western bay mouth(west to 87°E) but is much shallower than its counterpart at the equator.It is suggested to be the residual of the ASHSW,which intrudes into the BOB during the preceding southwest monsoon.Our results also show that,in the south of Sri Lanka,just below this subsurface high-salinity water,very-low-salinity water(about 34.8) occurs at depths of 100-200 m.Further analysis suggests that this low-salinity water comes from the BOB.The distribution of hydrography and circula- tion in the eastern tropical Indian Ocean （ETIO） during April-May 2011 were analyzed using cruise observations, satellite observations, and historic hydrographic data. It was observed that warm water （〉28℃） occupies the up- per 50-m layer in the ETIO. Low-salinity surface water was observed at the mouth of the Bay of Bengal （BOB）, which further extends to the Arabian Sea and off Sumatra via the Sri Lanka coast and the eastern bay mouth, Ara- bian Sea high-salinity water （ASHSW） is carried eastward along the equator to around 90~E by the equatorial un- dercurrent （EUC）. It also runs south of Sri Lanka （north to 3~N） and in the western bay mouth （west to 87~E） but is much shallower than its counterpart at the equator. It is suggested to be the residual of the ASHSW, which intrudes into the BOB during the preceding southwest monsoon. Our results also show that, in the south of Sri Lanka, just below this subsurface high-salinity water, very-low-salinity water （about 34.8） occurs at depths of 100-200 m. Further analysis suggests that this low- salinity water comes from the BOB.

关 键 词：eastern tropical Indian Ocean hydrography CIRCULATION 

分 类 号：P337[天文地球—水文科学] P732.6[水利工程—水文学及水资源]