Spatiotemporal Variation of Anticyclonic Eddies in the South China Sea during 1993-2019
Spatiotemporal Variation of Anticyclonic Eddies in the South China Sea during 1993-2019
复制标题
DOI：
10.3390/rs15194720
复制
发表时间：
2023-09
期刊：
影响因子：
--
通讯作者：
Weian Shi;Jianyu Hu
中科院分区：
文献类型：
--
作者：
Weian Shi;Jianyu Hu
本文利用哥白尼海洋环境监测站的绝对动力地形资料，应用地形位置指数，提出了一种新的南海反气旋涡旋制图方法。结果表明，南海深盆区存在活跃的反气旋性涡旋，所选取的5个参数（数量或频率、寿命、动能、振幅、面积或半径）具有相似的时间变化和空间分布规律。(1)从月变化看，反气旋涡旋在春末活跃，夏季最活跃。(2)2013年以前，厄尔尼诺-南方涛动对南海反气旋涡旋年际变化的影响较强，导致这5个参数在2004年前后出现显著的年际变化转折。在2013年之后，这五个参数中的大多数在2015年达到最小值，在2017年达到最大值。(3)分析表明，南海涡动活动受季风和黑潮等西边界流的影响显著。因此，台湾岛西南部和越南东部是反气旋涡旋最活跃的两个区域，具有较大的涡旋动能和振幅。
Based on the absolute dynamic topography data from the Copernicus Marine Environment Monitoring Service, this paper applies the Topographic Position Index to develop a new approach for mapping the anticyclonic eddies in the South China Sea (SCS). The results show that anticyclonic eddies are active in the deep basin of SCS, and the five selected parameters (number or frequency, lifetime, kinetic energy, amplitude, and area or radius) of anticyclonic eddies have a similar temporal variation and a similar spatial distribution pattern. (1) As for monthly variations, anticyclonic eddies are active in late spring and most active in summer. (2) The El Niño–Southern Oscillation had a stronger impact on the inter-annual variations of anticyclonic eddies in the SCS before 2013, resulting in a significant transition of inter-annual variations of these five parameters in around 2004. After 2013, most of these five parameters had a minimum in 2015 and a maximum in 2017. (3) Analyses show that the eddy activities in the SCS are significantly influenced by the monsoon wind and the western boundary current like Kuroshio. Therefore, the areas southwest of Taiwan Island and east of Vietnam are the two areas where the anticyclonic eddies are most active, with much larger eddy kinetic energy and much higher eddy amplitude.