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| 风急流对吕宋海峡黑潮路径变异的影响及其动力机制 |
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常锑1,2,3, 王铮1,2, 袁东亮1,2
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1.中国科学院海洋研究所, 山东 青岛 266071;2.中国科学院 海洋环流与波动重点开放实验室, 山东 青岛 266071;3.中国科学院研究生院, 北京 100049
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| 摘要: |
| 为研究风急流对吕宋海峡处黑潮路径的影响，本文使用1.5层约化重力浅水模式，设置了与吕宋海峡跨度相接近的缺口宽度，考虑西边界流在西边界缺口处当处于迟滞过程的临界状态时，其路径受风急流影响的动力机制，并初步探讨了在实际海陆边界条件下，实际风急流对黑潮路径的影响。结果显示，理想情况下，当西边界流处在由入侵流态到跨隙流态转变的临界状态时，西风、南风以及西南风风急流可以激发西边界流由入侵流态转变为跨隙流态。当西边界流处在由跨隙流态向入侵流态转变的临界状态时，北风、东风以及东北风风急流可以激发西边界流由跨隙流态转变为入侵流态，并且在风急流消失后西边界流不能再恢复到初始流态。实际情况下，冬季风急流有利于黑潮入侵南海，夏季风急流有利于黑潮跨越吕宋海峡，这和理想情况下的模拟结果以及实际观测结果相一致，这对进一步研究南海北部的上层环流以及南海的质量、能量输送有重要意义。 |
| 关键词: 迟滞现象 缺口宽度 实际风急流 |
| DOI：10.11759/hykx20200721001 |
| 分类号:P733.1 |
| 基金项目:国家自然科学基金面上项目（41876025） |
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| Dynamics of wind jet-induced Kuroshio variability in the Luzon Strait |
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CHANG Ti1,2,3, WANG Zheng1,2, YUAN Dong-liang1,2
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1.Institute of Oceanology, the Chinese Academy of Sciences, Qingdao 266071, China;2.Key Laboratory of Ocean Circulation and Waves, the Chinese Academy of Sciences, Qingdao 266071, China;3.Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| Using a 1.5-layer reduced gravity shallow-water ocean model and setting up an analogical gap width corresponding to the Luzon Strait, this paper studies the dynamics of the various wind jet effects on the western boundary current when it is at a critical state with a gap. In addition, this subject is discussed considering real bottom and real wind jets. The results show that in an ideal case, when the western boundary current (WBC) is in a critical state of transition from periodic penetrating to leaping, south, west, and southwest wind jets can induce the WBC from an anticyclonic intrusion to a gap-leaping state. Meanwhile, when the WBC is in a critical state of leaping to periodic penetrating, north, east, and northeast wind jets can force the WBC penetrating into the South China Sea. The WBC cannot return to its initial path after the local wind jets are removed. In the real case related to real bottom and real wind jets, experiments show that winter (summer) wind jets can induce the Kuroshio from the leaping (periodic penetrating) state to the periodic penetrating (leaping) regimes due to the eddies it produced, which is consistent with the observed facts and ideal experiments. This paper systematically studies the influence of the wind jet on the Kuroshio path in the Luzon Strait, which is of great significance to further study the upper circulation in the north of the South China Sea and the mass and energy transport of the South China Sea. |
| Key words: hysteresis width of gap real bottom actual wind jets |