Seasonal variability of the west-east water mass exchange on the section of central equatorial Indian Ocean and its regional difference

ZHANG Yuhong; DU Yan; XU Haiming

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ZHANG Yuhong, DU Yan, XU Haiming. Seasonal variability of the west-east water mass exchange on the section of central equatorial Indian Ocean and its regional difference[J]. Haiyang Xuebao, 2012, 34(2): 30-38.

Citation:

ZHANG Yuhong, DU Yan, XU Haiming. Seasonal variability of the west-east water mass exchange on the section of central equatorial Indian Ocean and its regional difference[J]. Haiyang Xuebao, 2012, 34(2): 30-38.

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Seasonal variability of the west-east water mass exchange on the section of central equatorial Indian Ocean and its regional difference

1.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China
2.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
3.
College of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China

Received Date: 2010-07-23
Rev Recd Date: 2011-05-23

Abstract

Abstract

Based on the ocean reanalysis data sets and observations, the authors analyze the west-east water mass exchange in the central Indian Ocean. It is found that there are two independent processes in the equatorial Indian Ocean(EIO, 2°S-2°N) and the North Indian Ocean(NIO, 4°-6°N), respectively. The NIO process is mainly induced by monsoon current, which advects low-salinity water westward from November to March, and during May-September the high-salinity water is carried to the east. The westward advection is stronger than the eastward, so the annual mean shows westward. The EIO process can be divided into the surface and the subsurface process. The surface equatorial process driven by equatorial wind is characterized by a semiannual cycle. During April-May and October-November, the high-salinity water of Arabian Sea is transported eastward, and the low-salinity water of Bay of Bengal westward in the other months. The annual mean advoction is eastward. The high-salinity water is eastward conveyed by subsurface equatorial process all year around.
- central Indian Ocean,
- west-east water mass exchange,
- north Indian Ocean process,
- equatorial Indian Ocean process

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References(20)

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