基于多套数据的印度洋深层经向翻转环流的动力特征

doi:10.11978/2015126

Journal of Tropical Oceanography ›› 2016, Vol. 35 ›› Issue (4): 11-20.doi: 10.11978/2015126CSTR: 32234.14.2015126

Special Issue: 海洋大数据及应用；海上丝绸之路专题

• Marine Hydrography • Previous Articles Next Articles

The dynamic characteristics of deep meridional overturning circulation in the Indian Ocean based on six reanalysis datasets

HUANG Xumei^{1, 2}, WANG Weiqiang¹, LIU Hailong³

1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. State Key Laboratory of Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;

Received:2015-10-14 Online:2016-07-29 Published:2016-08-04
Contact: WANG Weiqiang, E-mail: weiqiang.wang@scsio.ac.cn
Supported by:
The Strategic Priority Research Program of the Chinese Academy of Sciences (grant no; XDA11010301); the National Natural Science Foundation of China (41376024); the National Key Program for Developing Basic Sciences (2013CB956204)

Abstract

Abstract: The dynamic characteristics of time-mean meridional overturning circulation in the Indian Ocean was examined using six reanalysis datasets. The results showed consistent time-mean features of the deep meridional overturning circulation, which is an anticlockwise overturning cell with inflows in the bottom and deep layers and outflows in the intermediate and upper layers. Dynamic decomposition of meridional overturning circulation was applied to examine the similarities and differences of every dynamic component. The structure of Ekman component is an anticlockwise overturning cell in the South Indian Ocean with maximum strength at ~10°S. In the region south of 10°S, geostrophic and external components show clockwise and anticlockwise overturning cells, respectively, they both reach maximum strengths at ~27°S. Based on different products of heat and momentum fluxes used, the dynamic components resulted from the six datasets show some inconsistent features as follows. The overall structures of Ekman component are similar since the wind fields of the six datasets have few differences. The discrepancies of the geostrophic component in the six datasets are due to the strength of the baroclinic flows in the interior ocean and the structure of the western boundary current: the greater the baroclinic flows in the interior ocean, the stronger the strength of the geostrophic component; the wider the western boundary current, the greater impact on the baroclinic flows in the interior ocean, and then on the strength of the geostrophic component. The strength of the external component is affected by the intensity of the western boundary current: the greater the western boundary current, the stronger the strength of the external component.

Key words: deep meridional overturning circulation, Ekman component, geostrophic component, external component, time mean

CLC Number:

P731.27

HUANG Xumei, WANG Weiqiang, LIU Hailong. The dynamic characteristics of deep meridional overturning circulation in the Indian Ocean based on six reanalysis datasets[J].Journal of Tropical Oceanography, 2016, 35(4): 11-20.

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The dynamic characteristics of deep meridional overturning circulation in the Indian Ocean based on six reanalysis datasets

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