| 南海北部陆坡中尺度涡的演化及传播规律分析 |
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| 引用本文： | 程子,周朦,钟贻森,张召儒,刘海龙,周磊.南海北部陆坡中尺度涡的演化及传播规律分析[J].海洋学报(英文版),2020,39(3):36-44. |
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| 作者姓名： | 程子 周朦 钟贻森 张召儒 刘海龙 周磊 |
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| 作者单位： | 上海交通大学海洋研究院, 上海, 200030,上海交通大学海洋研究院, 上海, 200030,上海交通大学海洋研究院, 上海, 200030,上海交通大学海洋研究院, 上海, 200030,上海交通大学海洋研究院, 上海, 200030,上海交通大学海洋研究院, 上海, 200030 |
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| 基金项目： | The National Basic Research Program of China under contract Nos 2014CB441500 and 2014CB441506, the National Natural Science Fundation of China under contract No. 41706014; the Shanghai Jiao Tong University Fund under contract No. 2019 SJTU-HKUST. |
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| 摘 要： | The continental slope in the northern South China Sea(SCS) is rich in mesoscale eddies which play an important role in transport and retention of nutrients and biota. In this study, we investigate the statistical properties of eddy distributions and propagation in a period of 24 years between 1993 and 2016 by using the altimeter data. A total of 147 eddies are found in the continental slope region(CSR), including 70 cyclonic eddies(CEs) and 77 anticyclonic eddies(ACEs). For those eddies that appear in the CSR, the surrounding areas of Dongsha Islands(DS) and southwest of Taiwan(SWT) are considered as the primary sources, where eddies generated contribute more than 60% of the total. According to the spatial distribution of eddy relative vorticity, eddies are weakening as propagating westward. Although both CEs and ACEs roughly propagate along the slope isobaths, there are discrepancies between CEs and ACEs. The ACEs move slightly faster in the zonal direction, while the CEs tend to cross the isobaths with large bottom depth change. The ACEs generally move further into the basin areas after leaving the CSR while CEs remain around the CSR. The eddy propagation on the continental slope is likely to be associated with mean flow at a certain degree because the eddy trajectories have notable seasonal signals that are consistent with the seasonal cycle of geostrophic current. The results indicate that the eddy translation speed is statistically consistent with geostrophic velocity in both magnitude and direction.
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| 关 键 词： | the South China Sea CONTINENTAL SLOPE Dongsha ISLANDS EDDY STATISTICS EDDY propagation |
| 收稿时间： | 2018/11/15 0:00:00 |
Statistical characteristics of mesoscale eddies on the continental slope in the northern South China Sea |
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| Cheng,Zi,Zhou,Meng,Zhong,Yisen,Zhang,Zhaoru,Liu,Hailong,Zhou,Lei.Statistical characteristics of mesoscale eddies on the continental slope in the northern South China Sea[J].Acta Oceanologica Sinica,2020,39(3):36-44. |
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| Authors: | Cheng Zi Zhou Meng Zhong Yisen Zhang Zhaoru Liu Hailong Zhou Lei |
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| Institution: | School of Oceanography, Shanghai Jiao Tong University, Shanghai 200030, China |
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| Abstract: | The continental slope in the northern South China Sea (SCS) is rich in mesoscale eddies which play an important role in transport and retention of nutrients and biota. In this study, we investigate the statistical properties of eddy distributions and propagation in a period of 24 years between 1993 and 2016 by using the altimeter data. A total of 147 eddies are found in the continental slope region (CSR), including 70 cyclonic eddies (CEs) and 77 anticyclonic eddies (ACEs). For those eddies that appear in the CSR, the surrounding areas of Dongsha Islands (DS) and southwest of Taiwan (SWT) are considered as the primary sources, where eddies generated contribute more than 60% of the total. According to the spatial distribution of eddy relative vorticity, eddies are weakening as propagating westward. Although both CEs and ACEs roughly propagate along the slope isobaths, there are discrepancies between CEs and ACEs. The ACEs move slightly faster in the zonal direction, while the CEs tend to cross the isobaths with large bottom depth change. The ACEs generally move further into the basin areas after leaving the CSR while CEs remain around the CSR. The eddy propagation on the continental slope is likely to be associated with mean flow at a certain degree because the eddy trajectories have notable seasonal signals that are consistent with the seasonal cycle of geostrophic current. The results indicate that the eddy translation speed is statistically consistent with geostrophic velocity in both magnitude and direction. |
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| Keywords: | the South China Sea continental slope Dongsha Islands eddy statistics eddy propagation |
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