Eddy generation mechanism in the eastern South China Sea

Chen Jiajia; Cheng Xuhua; Chen Xiao

doi:10.1007/s13131-019-1409-3

南海东部中尺度涡生成机制

doi: 10.1007/s13131-019-1409-3

1.
河海大学海洋学院南京中国
2.
河海大学海洋学院南京中国;Key Laboratory of Coastal Disaster and Defence (Hohai University), Ministry of Education, Nanjing 210098, China

基金项目: The National Natural Science Foundation of China under contract Nos 41522601, 41876002, 41876224 and 4170060064; the Fundamental Research Funds for the Central Universities under contract Nos 2017B04714 and 2017B4114.

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- 收稿日期: 2018-06-14

Eddy generation mechanism in the eastern South China Sea

1.
College of Oceanography, Hohai University, Nanjing 210098, China
2.
College of Oceanography, Hohai University, Nanjing 210098, China;Key Laboratory of Coastal Disaster and Defence (Hohai University), Ministry of Education, Nanjing 210098, China

摘要

摘要: 利用高度计海面高度异常数据和非线性1½层约化重力模式研究了南海东部中尺度涡的生成机制。模式结果表明，南海内区风场是南海东部中尺度涡生成的主要驱动力，且南海内区高频风场能解释约54%的南海东部中尺度涡。从西太平洋传来的信号同样有十分重要的作用，由西太区域高频风场大致能解释南海东部40%的中尺度涡。风驱动的赤道附近的海面异常信号能经过锡布图通道和民都洛海峡传播到吕宋岛西海岸，其中有部分能量会以罗斯贝波的形式往西传播。这种信号在西传的过程中会发生不稳定，可能形成孤立的涡旋。
- 中尺度涡 /
- 南海 /
- 风应力 /
- 罗斯贝波
Abstract: Mesoscale eddy generation mechanisms in the eastern South China Sea (ESCS) are investigated using altimetry observations and solutions of a nonlinear, 1½-layer reduced-gravity model. We estimate the relative roles of the wind forcing in the interior South China Sea (SCS) and the remote forcing from the western tropical Pacific (WTP) in eddy generation in the ESCS. Model solutions show that the high-frequency wind in the interior SCS is the primary forcing for eddies, which explains about 54% of the mesoscale eddies generated in the ESCS. Signals from the WTP also play an important role. Wind-driven equatorial signals reach the west coast of Luzon Island through the Sibutu Passage and Mindoro Strait. The reflected Rossby waves from the west coast of Luzon Island propagate westward, become unstable, and turn into eddies. The signals driven by high-frequency wind from the WTP explain about 40% of the mesoscale eddies generated in the ESCS. The high-frequency wind forcing in both the SCS and the WTP is important for eddy generation in the ESCS.
- mesoscale eddy /
- South China Sea /
- wind forcing /
- Rossby wave

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文章访问数: 598
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南海东部中尺度涡生成机制

doi: 10.1007/s13131-019-1409-3

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Eddy generation mechanism in the eastern South China Sea

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