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Three-dimensional structure and interannual variability of the kuroshio loop current in the northeastern south china sea

机译：东北南海汽车循环电流的三维结构与续变量

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摘要

Based on long-term mooring-array and satellite observations, three-dimensional structure and interannual variability of the Kuroshio Loop Current (KLC) in the northeastern South China Sea (SCS) were investigated. The 3-yr moored data between 2014 and 2017 revealed that the KLC mainly occurred in winter and it exhibited significant interannual variability with moderate, weak, and strong strengths in the winters of 2014/15, 2015/16, and 2016/17, respectively. Spatially, the KLC structure was initially confined to the upper 500 m near the Luzon Strait, but it became more barotropic, with kinetic energy transferring from the baroclinic mode to the barotropic mode when it extended into the SCS interior. Through analyzing the historical altimeter data between 1993 and 2019, it is found that the KLC event in 2016/17 winter is the strongest one since 1993. Moored-data-based energetics analysis suggested that the growth of this KLC event was primarily fed by the strong wind work associated with the strengthened northeast monsoon in that La Nina-year winter. By examining all of the historical KLC events, it is found that the strength of KLC is significantly modulated by El Nino-Southern Oscillation, being stronger in La Nina and weaker in El Nino years. This interannual modulation could be explained by the strengthened (weakened) northeast monsoon associated with the anomalous atmospheric cyclone (anticyclone) in the western North Pacific during La Nina (El Nino) years, which inputs more (less) energy and negative vorticity southwest of Taiwan that is favorable (unfavorable) for the development of KLC.
机译：基于长期系泊阵列和卫星观测，研究了东北南海（SCS）中KUROSHIO环电流（KLC）的三维结构和际变化。 2014年至2017年间的3年间停泊数据透露，KLC主要发生在冬季，分别在2014/15年，2016/16年和2016/17年度的温和性和强大的优势中表现出显着的际际变异性。在空间上，KLC结构最初被限制在吕宋海峡附近的较高500米，但它变得更加条距，当延伸到SCS内部时，动能从曲金模式转移到波调模式。通过分析1993年至2019年间的历史高度计数据，发现2016/17年冬季的KLC活动是自1993年以来最强的。基于数据的能量分析表明，这一KLC事件的增长主要由与加强东北季风相关的强风的工作在尼娜冬季。通过审查所有历史急诊活动事件，发现KLC的强度受到EL Nino-Southern振荡的显着调节，La Nina更强大，埃尔尼诺州的较弱。这种持续的调节可以通过与西北太平洋的异常大气旋风旋风（Anticyclone）相关的加强（削弱）东北季风在La Nina（El Nino）年期间，其中输入了台湾西南部的更多（较少）的能量和负涡度对KLC的发展有利（不利）。

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    《Oceanographic Literature Review》 |2020年第10期|2084-2084|共1页
  • 作者

    Z. Sun; Z. Zhang; B. Qiu;

  • 作者单位

    Physical Oceanography Laboratory/IAOS and Frontiers Science Center for Deep Ocean Multispheres and Earth System Ocean University of China Laboratory for Ocean Dynamics and Climate National Laboratory for Marine Science and Technology Qingdao China;

    Physical Oceanography Laboratory/IAOS and Frontiers Science Center for Deep Ocean Multispheres and Earth System Ocean University of China Laboratory for Ocean Dynamics and Climate National Laboratory for Marine Science and Technology Qingdao China;

    Physical Oceanography Laboratory/IAOS and Frontiers Science Center for Deep Ocean Multispheres and Earth System Ocean University of China Laboratory for Ocean Dynamics and Climate National Laboratory for Marine Science and Technology Qingdao China;

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