The mean properties and variations of the Southern Hemisphere subpolar gyres estimated by Simple Ocean Data Assimilation (SODA) products

DUAN Yongliang; LIU Hongwei; YU Weidong; HOU Yijun

doi:10.1007/s13131-016-0901-2

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DUAN Yongliang, LIU Hongwei, YU Weidong, HOU Yijun. The mean properties and variations of the Southern Hemisphere subpolar gyres estimated by Simple Ocean Data Assimilation (SODA) products[J]. Acta Oceanologica Sinica, 2016, 35(7): 8-13. doi: 10.1007/s13131-016-0901-2

Citation:

DUAN Yongliang, LIU Hongwei, YU Weidong, HOU Yijun. The mean properties and variations of the Southern Hemisphere subpolar gyres estimated by Simple Ocean Data Assimilation (SODA) products[J]. Acta Oceanologica Sinica, 2016, 35(7): 8-13. doi: 10.1007/s13131-016-0901-2

Citation:

DUAN Yongliang, LIU Hongwei, YU Weidong, HOU Yijun. The mean properties and variations of the Southern Hemisphere subpolar gyres estimated by Simple Ocean Data Assimilation (SODA) products[J]. Acta Oceanologica Sinica, 2016, 35(7): 8-13. doi: 10.1007/s13131-016-0901-2

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The mean properties and variations of the Southern Hemisphere subpolar gyres estimated by Simple Ocean Data Assimilation (SODA) products

doi: 10.1007/s13131-016-0901-2

1.
Center for Ocean and Climate Research, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
2.
Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China

Received Date: 2015-06-02
Rev Recd Date: 2015-08-14

Abstract

Abstract

Based on the Simple Ocean Data Assimilation (SODA) products, we study the mean properties and variations of the Southern Hemisphere subpolar gyres (SHSGs) in this paper. The results show that the gyre strengths in the SODA estimates are (55.9±9.8)×10⁶ m³/s for the Weddell Gyre (WG), (37.0±6.4)×10⁶ m³/s for the Ross Gyre (RG), and (27.5±8.2)×10⁶ m³/s for the Australian-Antarctic Gyre (AG), respectively. There exists distinct connectivity between the adjacent gyres and then forms an oceanic super gyre structure in the southern subpolar oceans. And the interior exchanges are about (8.0±3.2)×10⁶ m³/s at around 70°E and (4.3±3.1)×10⁶ m³/s at around 140°E. The most pronounced variation for all three SHSGs occurs on the seasonal time scale, with generally stronger (weaker) SHSGs during austral winter (summer). And the seasonal changes of the gyre structures show that the eastern boundary of the WG and AG extends considerably further east during winter and the interior exchange in the super gyre structure increases accordingly. The WG and RG also show significant semi-annual changes. The correlation analyses confirm that the variations of the gyre strengths are strongly correlated with the changes in the local wind forcing on the semi-annual and seasonal time scales.
- the subpolar gyres,
- Southern Ocean,
- wind stress,
- wind stress curl

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References(45)

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