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Low ocean-floor rises regulate subpolar sea surface temperature by forming baroclinic jets

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Title: Low ocean-floor rises regulate subpolar sea surface temperature by forming baroclinic jets
Authors: Mitsudera, Humio Browse this author →KAKEN DB
Miyama, T. Browse this author
Nishigaki, H. Browse this author
Nakanowatari, T. Browse this author
Nishikawa, H. Browse this author
Nakamura, Tomohiro Browse this author →KAKEN DB
Wagawa, T. Browse this author
Furue, R. Browse this author
Fujii, Y. Browse this author
Ito, S. Browse this author
Issue Date: 22-Mar-2018
Publisher: Nature Publishing Group
Journal Title: Nature communications
Volume: 9
Start Page: 1190
Publisher DOI: 10.1038/s41467-018-03526-z
Abstract: 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.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 三寺 史夫

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