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首页> 外文期刊>Journal of Physical Oceanography >Why Are There Upwellings on the Northern Shelf of Taiwan under Northeasterly Winds?
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Why Are There Upwellings on the Northern Shelf of Taiwan under Northeasterly Winds?

机译：为什么在北风的作用下台湾北部大陆架出现上升流？

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摘要

Upwellings are observed on the northern shelf of Taiwan during northeasterly winds. Analytical and realistic numerical models are used to explain how vertical motions are created by divergence and convergence produced by wind acting on the vorticity field of two strong jets: the Kuroshio and the Taiwan Warm Current. The seaward increase in cyclonic vorticity near the Kuroshio's western edge favors a stronger Ekman transport away from the jet, producing upwelling at the shelfbreak under a northeasterly wind. A similar mechanism for generating vertical motions is found across the Taiwan Warm Current. The numerical model results indicate that the vorticity effects can account for up to 30%-50% of the total variation in the surface Ekman transport. Except during summer's weak southwesterlies, northeasterly wind is dominant over the East China Sea, suggesting that the vorticity effects may be prominent in the observed shelfbreak upwelling in nonsummer months.
机译：在东北风期间，在台湾北部陆架上观测到上升流。分析和现实的数值模型用于解释垂直运动是如何通过风对两种强喷射流（黑潮和台湾暖流）的涡流场产生的发散和会聚产生的。黑潮西部边缘附近的旋风涡向海性增加，有利于更强的埃克曼运输能力，使其远离喷气机，并在东北风的作用下在架子断裂处产生上升流。在台湾暖流中也发现了类似的产生垂直运动的机制。数值模型结果表明，涡度效应可占表面Ekman传输总变化的30％-50％。除夏季西南偏弱外，东北风在东中国海占主导地位，这表明在非夏季月份观测到的陆架破裂上升流中，涡度效应可能很明显。

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  • 来源
    《Journal of Physical Oceanography》 |2010年第6期|P.1405-1417|共13页
  • 作者

    Yu-Lin Changl; Lie-Yauw Oey; Chau-Ron Wu; Hung-Fu Lu;

  • 作者单位

    Program in Atmospheric and Oceanic Sciences, Princeton University, Princeton, New Jersey, and Department of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan;

    rnProgram in Atmospheric and Oceanic Sciences, Princeton University, Princeton, New Jersey Program in Atmospheric and Oceanic Sciences, Sayre Hall, Princeton, NJ 08544;

    rnDepartment of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan;

    rnDepartment of Earth Sciences, National Taiwan Normal University, Taipei, Taiwan;

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