Lagrangian Observation of the Kuroshio Current by Surface Drifters in 2019
Lagrangian Observation of the Kuroshio Current by Surface Drifters in 2019
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2019年海表漂流者对黑潮的拉格朗日观测
DOI：
10.3390/jmse10081027
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发表时间：
2022-07
影响因子：
2.9
通讯作者：
Xuewen Wu
中科院分区：
文献类型：
--
作者：
Zhenyu Sun;Jianyu Hu;Hongyang Lin;Zhaozhang Chen;Jia Zhu;Longqi Yang;Zhiyuan Hu;Xirong Chen;Xuewen Wu
本研究基于29个自主研制的表层流实验漂流器在西太平洋和东海的观测资料，研究了2019年黑潮的特征。2019年观测到的黑潮流型和流速大小与基于历史漂流物数据集的气候基本一致，但仍表现出独特的特征。黑潮在春季入侵南海，是由一群漂流者自东向西穿越吕宋海峡而观测到的，这与历史记录中黑潮在春季无入侵的模式有明显的不同。黑潮也有强烈侵入东海，并在台湾岛东北部转向反气旋。漂流物轨迹和高度计衍生的动力地形都捕捉到了2019年日本以南黑潮的大型弯曲模式，其流动路径的最大离岸距离为470公里。此外，拉格朗日统计（横向扩散率，积分时间尺度，积分空间尺度）估计为四个选定的区域有足够的漂流采样。横向扩散率在东海黑潮段沿着有较大的值，在东海陆架区有较小的值。4个区域的积分时间尺度为0.8 ~ 3.7天，对应的积分空间尺度为19~128 km。
In this research, the features of the Kuroshio Current in 2019 were studied based on the observations of 29 self-developed surface current experiment drifters deployed in the western Pacific Ocean and the East China Sea. The Kuroshio flow pattern and velocity magnitude observed in 2019 were largely consistent with the climatology based on the historical drifter dataset, but they still exhibited distinctive characteristics. The intrusion of the Kuroshio into the South China Sea in the spring was observed by a group of drifters crossing the Luzon Strait from east to west, which is a notable departure from the non-intrusion pattern noted to occur in the spring in most of the historical records. A strong intrusion of the Kuroshio into the East China Sea was also observed, taking an anti-cyclonic turn in the northeast of Taiwan Island. Both the drifter trajectories and altimeter-derived dynamical topography captured the large meander pattern of the Kuroshio south of Japan in 2019, with the flow path having a maximum offshore distance of 470 km. In addition, Lagrangian statistics (lateral diffusivity, integral time scale, and integral space scale) were estimated for four selected regions with adequate drifter samplings. The lateral diffusivity had large values along the Kuroshio segment in the East China Sea and small values on the continental shelf of the East China Sea. The integral time scales for the four regions ranged from 0.8 to 3.7 days, with a corresponding integral space scale of 19~128 km.
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