热带海洋学报 ›› 2023, Vol. 42 ›› Issue (3): 75-85.doi: 10.11978/2022152CSTR: 32234.14.2022152

• 海洋水文学 • 上一篇    下一篇

挟带黑潮高盐水的中尺度涡在南海北部的时空特征

杨一凯1(), 曾丽丽1,2()   

  1. 1.热带海洋环境国家重点实验室(中国科学院南海海洋研究所), 广东 广州 510301
    2.南方海洋科学与工程广东省实验室(广州), 广东 广州 511458
  • 收稿日期:2022-07-05 修回日期:2022-09-14 出版日期:2023-05-10 发布日期:2022-09-28
  • 作者简介:

    曾丽丽(1981—), 女, 山东省聊城市人, 研究员, 博士, 博士生导师, 从事海洋环流动力和海气相互作用研究。email:

  • 基金资助:
    南方海洋科学与工程广东省实验室(广州)专项(GML2019ZD0306); 国家自然科学基金项目(41676018); 广州市科技计划项目(202002030490)

Spatiotemporal characteristics of mesoscale eddies with transport capability of saline Kuroshio water in the northern South China Sea

YANG Yikai1(), ZENG Lili1,2()   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
    2. Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
  • Received:2022-07-05 Revised:2022-09-14 Online:2023-05-10 Published:2022-09-28
  • Supported by:
    Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)(GML2019ZD0306); National Natural Science Foundation of China(41676018); Science and Technology Planning Project of Guangzhou City, China(202002030490)

摘要:

吕宋海峡处涡致输运显著影响南海北部的热盐平衡。本文利用1993—2018年间的AVISO卫星数据, 识别和筛选了南海北部76个黑潮脱落反气旋涡、46个黑潮伴生气旋涡、29个南海局地反气旋涡和40个南海局地气旋涡。分析发现, 四类涡旋的平均非线性系数均远大于1, 证实了筛选涡旋具有黑潮高盐水输运能力。涡旋传播路径受南海北部地形影响, 在西向传播过程中向西南向偏移。相较于气旋涡, 反气旋涡形成之后向南海北部移动了更远的距离。涡旋多形成于吕宋海峡中部, 而随着纬度的升高或降低, 形成概率逐渐减小。脱落(伴生)涡旋多形成于秋冬两季而夏季最少, 以反气旋涡居多, 平均每月反气旋涡要比气旋涡多2.5个; 年平均脱落(伴生)涡旋数目约为4.6, 且气旋涡并不是每年都形成。整体上, El Niño事件通过影响黑潮路径而使得黑潮脱落或伴生的涡旋数目增多。

关键词: 南海北部, 黑潮, 高盐水, 中尺度涡旋

Abstract:

Eddy-induced transport in the Luzon Strait significantly affects the thermo-salt balance in the northern South China Sea. Using the AVISO satellite data from 1993 to 2018, this paper identifies and screens 76 Kuroshio shedding anticyclic eddies, 46 Kuroshio associated cyclonic eddies, 29 South China Sea (SCS) locally-formed anticyclic eddies and 40 SCS locally-formed cyclonic eddies in the northern SCS. The average nonlinear coefficients of the four types of eddies are all much larger than 1, which confirms that the screening eddies do have the capacity of transporting the saline Kuroshio water. The propagation paths of the eddy are affected by the topography of the northern SCS, and shift to the southwest during the westward propagation process. Compared with the cyclonic eddy, the anticyclonic eddy moved farther to the northern part of the SCS. The eddies are mostly formed in the middle of the Luzon Strait, and the probability of formation gradually decreases with the increase or decrease of latitude. The shedding (associated) eddies are mostly formed in autumn and winter and the least in summer and the average number of anticyclonic eddies is 2.5 more than cyclonic eddies per month. The annual average number of shedding (associated) eddies is about 4.6, and cyclonic eddies do not form every year. Overall, the El Niño event increases the number of Kuroshio shedding or associated eddies by affecting the Kuroshio path.

Key words: northern South China Sea, Kuroshio, saline water, mesoscale eddy