第51回 ESCセミナー
The South Indian subtropical countercurrent
- 日時
- 2009年4月10日 (金) 13:30-14:30
- 場所
- 横浜研究所 シミュレータ研究棟1F大会議室
- 講演者
- Dr. Ryo Furue (IPRC University of Hawaii)
- 使用言語
- 英語
要旨
In the North and South Pacific and in the South Indian, there exist near-surface currents flowing eastward in the equatorward half of the subtropical gyre, where the Sverdrup flow is generally westward. They are generally called subtropical countercurrents (SICCs). In the South Indian Ocean, SICCs form a broad flow impinging onto the coast of Australia. The southern-most branch of this flow is recently discovered to be narrow and strong and is called the South Indian countercurrent (SICC). In the present study, we describe the three-dimensional structure of the broad eastward flow and the SICC in Argo climatology and ocean-only numerical models.
The STCCs are confined to top ~200m, below which there are westward currents, which seem to form a baroclinic pair with the surface eastward currents. The SICC is deeper and stronger than the broad eastward flow to the north. The deep flow below the SICC seem to come from a westward current along the south coast of Australia. On the basis of these results, we propose hypotheses to explain the dynamics of the SICC and show some preliminary results of simple layer models to test the hypotheses.
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