The watermass variability and southward shift of the Southern Hemispheremid-depth supergyre |
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| Authors: | DUAN Yongliang HOU Yijun LIU Hongwei and LIU Yahao |
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| Institution: | 1. Center for 0cean and Climate Research, First Institute of 0ceanography, State 0ceanic Administration, Qingdao 266061, China
2. Key Laboratory of 0cean Circulation and Waves, Institute of 0ceanology, Chinese Academy of Sciences, Qingdao 266071, China |
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| Abstract: | The Southern Hemisphere subtropical supergyre at intermediate depths connects all three ocean basins and plays a significant role in responding and conveying the climate-change-related variations in the global ocean. On the basis of the Simple Ocean Data Assimilation (SODA) ocean reanalysis, the thermohaline variability and southward shift of themid-depth supergyre are demonstrated. The steric height of the subsurface relative to 1 500 m (400-1 500 m) from the SODA depicts exactly the flow patterns and variability of the oceanic supergyre. During 1958-2007 the water masses in the gyre interiors become cooler/fresher, with the significant exceptions of the Agulhas Current system and Agulhas leakage. The results also exhibit a pronounced strengthening of the inter-basin connection of the supergyre, and the strongest southward shift, by about 2.5° over the whole period, occurs in the central-south Pacific, which is associated with the changes in the basin-scale wind forcing. |
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| Keywords: | Southern Hemisphere supergyre thermohaline tendency steric height South Pacific |
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