The water mass variability and southward shift of the Southern Hemisphere mid-depth supergyre  

作　　者：DUAN Yongliang HOU Yijun LIU Hongwei LIU Yahao 

机构地区：[1]Center for Ocean and Climate Research,First Institute of Oceanography,State Oceanic Administration [2]Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences

出　　处：《Acta Oceanologica Sinica》2013年第11期74-81,共8页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract No.41006013;the National High Technology Research and Development Program of China (863 Program) under contract No.2008AA121701;the Public Science and Technology Research Funds Projects of Ocean Institute of Oceanology,Chinese Academy of Sciences under contract No.201205010;the National Basic Research Program of China (973Program) under contract No.2010CB950301

摘　　要：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 glob- al ocean. On the basis of the Simple Ocean Data Assimilation/SODA） ocean reanalysis, the thermohaline variability and southward shift of the mid-depth supergyre are demonstrated. The steric height of the sub- surface 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.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 glob- al ocean. On the basis of the Simple Ocean Data Assimilation/SODA） ocean reanalysis, the thermohaline variability and southward shift of the mid-depth supergyre are demonstrated. The steric height of the sub- surface 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.

关 键 词：Southern Hemisphere supergyre thermohaline tendency steric height South Pacific 

分 类 号：P731.2[天文地球—海洋科学]