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Low ocean-floor rises regulate subpolar sea surface temperature by forming baroclinic jets.
Nature Communications ( IF 16.6 ) Pub Date : 2018-03-22 , DOI: 10.1038/s41467-018-03526-z
H. Mitsudera , T. Miyama , H. Nishigaki , T. Nakanowatari , H. Nishikawa , T. Nakamura , T. Wagawa , R. Furue , Y. Fujii , S. Ito

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 (~500 m) compared with the depth of the North Pacific Ocean (~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.

中文翻译:

低海平面上升通过形成斜压射流来调节极地海面温度。

中高纬度海洋的海面温度(SST)锋面对温带大气环流和气候产生重大影响。在北极北部的太平洋中,冷的北极水和最近发现的准平稳流之间形成了尖锐的海温锋面,这些准定流对平流于黑潮东北方的温暖水域进行了平流。在这里,我们提出了一种喷射形成的新机制,尽管其高度比北太平洋的深度低(〜500 m),但它关注斜压的Rossby波的传播,该涡流由涡旋驱动的正压流在底部上升段上偏转。海洋(〜6000 m)。在正压流的控制下,罗斯比波使亚热带回旋带的上层较厚,而亚北极回旋带的层较薄,从而产生了厚度跳变,从而产生了表面射流,他们汇合的地方。这项研究揭示了低层底部地形在调节亚极海中海表温度异常中的作用。
更新日期:2018-03-22
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