| 摘要: |
| 夏季, 越南以东海域经常出现一对气旋涡和反气旋涡, 被称为越东偶极子(dipole off eastern Vietnam, DEV)。在DEV之间有一支东向离岸急流(eastward offshore jet, EOJ)。DEV-EOJ能显著提高该海域叶绿素浓度并改变浮游植物结构分布。DEV一般于夏季产生, 秋季消亡, 其气旋涡中心低温高盐, 反气旋涡中心高温低盐。DEV-EOJ的生消机制与西南季风密切相关, 同时也受到厄尔尼诺-南方涛动(El Ni?o-Southern oscillation, ENSO)等大洋尺度大气变化影响。目前, 虽然对DEV-EOJ已取得一定认识, 但仍有下述问题亟待解决: 1) DEV对南海中层动力和生态环境的影响; 2) DEV对南海西南部深层环流的作用; 3) 大尺度海气现象影响DEV-EOJ的过程及动力机制。建议开展长期的大面积同步阵列观测解决以上悬而未决的科学问题。 |
| 关键词: 南海 中尺度涡 离岸急流 海气作用 |
| DOI：10.11759/hykx20200805002 |
| 分类号:P73 |
| 基金项目:国家自然科学基金(41906023, 41920104006); 自然资源部第二海洋研究所基本科研业务费(JZ2001) |
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| Overview of the studies on the dynamics of the dipole off eastern Vietnam and its mechanisms |
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CAO Ru-xue1,2, LIU Zhao-jun2, ZHU Xiao-hua1,2
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1.Ocean College, Zhejiang University, Zhoushan 316021, China;2.State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
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| Abstract: |
| During summer, cyclonic and anticyclonic eddies typically occur pairwise as a dipole off eastern Vietnam (DEV); moreover, an eastward offshore jet (EOJ) exists between the DEV. The DEV–EOJ can substantially increase the chlorophyll concentration and alter the phytoplankton distribution in the region. The DEV generally occurs in the summer and dissipates by autumn. At the center of the cyclonic eddy, the salinity is high, and the temperature is low; at the center of the anticyclonic eddy, the salinity is low, and the temperature is high. The generation and dissipation of the DEV–EOJ are closely related to the southwest monsoon and are also affected by the El Ni?o–Southern Oscillation (ENSO) and other basin-scale atmospheric changes. Although the DEV–EOJ have been previously studied, the following issue persists: the influence of DEV on 1) the dynamic and ecological environment in the middle layers of the South China Sea, 2) the deep circulation in the southwest South China Sea, and 3) the effects of ocean–atmosphere interactions on the process and dynamic mechanism of the DEV–EOJ. Thus, long-term large-area synchronous-array observations will help address these concerns. |
| Key words: South China Sea mesoscale eddy offshore jet ocean–atmosphere interactions |
