Low ocean-floor rises regulate subpolar sea surface temperature by forming baroclinic jets
説明
Sea surface temperature (SST) fronts in mid-to high-latitude oceans have significant impacts on extratropical atmospheric circulations and climate. In the western subarctic Pacific, sharp SST fronts form between the cold subarctic water and the recently found quasi-stationary jets that advect warm waters originating in the Kuroshio northeastward. Here we present a new mechanism of the jet formation paying attention to the propagation of baroclinic Rossby waves that is deflected by eddy-driven barotropic flows over bottom rises, although their height is low (similar to 500 m) compared with the depth of the North Pacific Ocean (similar to 6000 m). Steered by the barotropic flows, Rossby waves bring a thicker upper layer from the subtropical gyre and a thinner upper layer from the subarctic gyre, thereby creating a thickness jump, hence a surface jet, where they converge. This study reveals an overlooked role of low-rise bottom topography in regulating SST anomalies in subpolar oceans.
収録刊行物
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- Nature communications
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Nature communications 9 1190-, 2018-03-22
Nature Publishing Group
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詳細情報 詳細情報について
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- CRID
- 1050564288979951872
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- NII論文ID
- 120006470992
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- HANDLE
- 2115/70589
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- ISSN
- 20411723
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- PubMed
- 29568009
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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- IRDB
- Crossref
- CiNii Articles
- KAKEN
- OpenAIRE
