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Evolution of an anticyclonic eddy southwest of Taiwan

机译:台湾西南部反气旋涡的演变

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摘要

Satellite images of sea-surface temperature, surface chlorophyll a concentration, and sea-level anomaly, together with ocean reanalysis data of Asia and Indian–Pacific Ocean (AIPOcean1.0), are utilized to study the three-dimensional characteristics and evolution of an anticyclonic warm eddy adjacent to the southwest coast of Taiwan during October and November 2006. Originated from the Kuroshio intrusion in the Luzon Strait, but unlike previously found westward moving anticyclonic eddies (AE) in the northeastern South China Sea, this AE was so close to the Taiwan coast and stayed where it was formed for over 1 month until it dissipated. Energy analysis is utilized to study the evolution process of the AE, and it shows that the barotropic instability (BTI) and baroclinic instability introduced by the Kuroshio intrusion flow appear to be the main energy sources for the AE. Periodical enhancement/relaxation of local northeasterly monsoon and its associated negative wind stress curl modify the current patterns in this region, reinforce the intraseasonal variability of the Kuroshio intrusion flow, and act together with Kuroshio to form the AE. Eddies detected from AIPOcean1.0 data also show that AEs are most likely to be generated southwest of Taiwan during the transition period of summer monsoon to winter monsoon, and generally, the BTI of Kuroshio intrusion contributes more than the direct wind stress work to the increase of the eddy kinetic energy for the generation and growth of the AEs.
机译:利用海面温度,地表叶绿素a浓度和海平面异常的卫星图像,以及亚洲和印度洋-太平洋的海洋再分析数据(AIPOcean1.0),研究了海面温度的三维特征和演变。在2006年10月至11月与台湾西南海岸相邻的反气旋暖涡。它起源于吕宋海峡的黑潮入侵,但与先前在南海东北部发现的向西移动的反气旋涡(AE)不同,这种AE与在台湾沿海地区停留了一个多月,直到消散为止。利用能量分析方法研究了AE的演化过程,结果表明,黑潮侵入流引入的正压不稳定性(BTI)和斜压不稳定性似乎是AE的主要能源。局部东北季风的周期性增强/松弛及其相关的负风应力卷曲会改变该区域的当前模式,增强黑潮侵入流的季节内变化,并与黑潮共同作用以形成AE。从AIPOcean1.0数据中检测到的涡流还表明,在夏季风向冬季风的过渡期间,极有可能在台湾西南部产生AE,并且通常,黑潮入侵的BTI对其造成的影响要大于直接的风应力工作。 AE的产生和增长的涡动能的变化。

著录项

  • 来源
    《Ocean Dynamics》 |2013年第5期|519-531|共13页
  • 作者单位

    State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences">(1);

    State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences">(1);

    International Center for Climate and Environmental Science Institute of Atmospheric Physics Chinese Academy of Sciences">(2);

    Graduate School of Oceanography University of Rhode Island">(3);

    State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences">(1);

    State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences">(1);

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Anticyclonic eddy; Kuroshio intrusion; Monsoon wind; South China Sea; Taiwan;

    机译:抗气旋涡黑潮的入侵;季风南中国海;台湾;

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