Analysis of Equatorial Currents Observed by Eastern Indian Ocean Cruises in 2010 and 2011  

作　　者：ZENG Xue-Zhi LI Yi-Neng PENG Shi-Qiu 

机构地区：[1]State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guang-zhou 510301, China [2]Graduate University of Chinese Academy of Scienees, Beijing 100049, China

出　　处：《Atmospheric and Oceanic Science Letters》2012年第4期280-283,共4页大气和海洋科学快报（英文版）

基　　金：supported by the Ministry of Science and Technology (MOST) of China(Grant No.2011CB403504);the Knowledge Innovation Program of the Chinese Academy of Sciences(Grant Nos.KZCX2-EW-208 and KZCX2-YW-Q11-02);the National Natural Science Foundationof China(Grant No.41076009)

摘　　要：Hydrographic and direct current measurements were made in the Eastern Equatorial Indian Ocean in May 2010 and April 2011 as part of the Eastern Indian Ocean Cruises(EIOC) organized by the South China Sea Institute of Oceanology(SCSIO).Analyses of the shipdrift Acoustic Doppler Current Profiler(ADCP) data indicate that the equatorial currents observed in May 2010 are characterized by a strongly eastward surface current(Wyrtki Jets,WJs) with a maximum velocity of 0.9 m s 1,while that observed in April 2011 is weak and without a consistent direction.The strongly eastward WJ transports the surface water eastward,resulting in a deeper upper mixed layer,as shown in the temperature and salinity profiles.However,it was found that the Equatorial Undercurrent(EUC) in the Eastern Indian Ocean is strong in April 2011 and weak in May 2010.The EUC was located approximately at the position of the thermocline,and it had higher salinity(up to approximately 35.5 psu) than the upper and lower waters.Hydrographic and direct current measurements were made in the Eastern Equatorial Indian Ocean in May 2010 and April 2011 as part of the Eastern Indian Ocean Cruises （EIOC） organized by the South China Sea Institute of Oceanology （SCSIO）. Analyses of the shipdrift Acoustic Doppler Current Profiler （ADCP） data in- dicate that the equatorial currents observed in May 2010 are characterized by a strongly eastward surface current （Wyrtki Jets, WJs） with a maximum velocity of 0.9 m s-1, while that observed in April 2011 is weak and without a consistent direction. The strongly eastward WJ transports the surface water eastward, resulting in a deeper upper mixed layer, as shown in the temperature and salinity pro- files. However, it was found that the Equatorial Undercurrent （EUC） in the Eastern Indian Ocean is strong in April 2011 and weak in May 2010. The EUC was located approximately at the position of the thermocline, and it had higher salinity （up to approximately 35.5 psu） than the upper and lower waters.

关 键 词：equatorial currents equatorial undercurrents Eastern Indian Ocean 

分 类 号：P732.6[天文地球—海洋科学] P731.21