| 南海北部东沙岛附近海洋底层流场特征及时间变化规律 |
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| 引用本文： | 李大伟,魏泽勋,王永刚,李淑江,徐腾飞,王冠琳,滕飞.南海北部东沙岛附近海洋底层流场特征及时间变化规律[J].海洋学报(英文版),2019,38(4):80-89. |
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| 作者姓名： | 李大伟 魏泽勋 王永刚 李淑江 徐腾飞 王冠琳 滕飞 |
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| 作者单位： | 国家海洋局第一海洋研究所, 海洋环境与数值模拟研究室, 青岛 266061, 中国;青岛海洋科学与技术国家实验室, 区域海洋动力学与数值模拟功能实验室, 青岛 266237, 中国,国家海洋局第一海洋研究所, 海洋环境与数值模拟研究室, 青岛 266061, 中国;青岛海洋科学与技术国家实验室, 区域海洋动力学与数值模拟功能实验室, 青岛 266237, 中国,国家海洋局第一海洋研究所, 海洋环境与数值模拟研究室, 青岛 266061, 中国;青岛海洋科学与技术国家实验室, 区域海洋动力学与数值模拟功能实验室, 青岛 266237, 中国,国家海洋局第一海洋研究所, 海洋环境与数值模拟研究室, 青岛 266061, 中国;青岛海洋科学与技术国家实验室, 区域海洋动力学与数值模拟功能实验室, 青岛 266237, 中国,国家海洋局第一海洋研究所, 海洋环境与数值模拟研究室, 青岛 266061, 中国;青岛海洋科学与技术国家实验室, 区域海洋动力学与数值模拟功能实验室, 青岛 266237, 中国,国家海洋局第一海洋研究所, 海洋环境与数值模拟研究室, 青岛 266061, 中国;青岛海洋科学与技术国家实验室, 区域海洋动力学与数值模拟功能实验室, 青岛 266237, 中国,国家海洋局第一海洋研究所, 海洋环境与数值模拟研究室, 青岛 266061, 中国;青岛海洋科学与技术国家实验室, 区域海洋动力学与数值模拟功能实验室, 青岛 266237, 中国 |
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| 基金项目： | The National Key Research and Development Program of China under contract No. 2017YFC1404201; the National Natural Science Foundation of China under contract Nos 41706035 and 41876029; the NSFC-Shandong Joint Fund for Marine Science Research Centers under contract No. U1606405; the Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology under contract No. 2017A01; the China Postdoctoral Science Foundation under contract No. 2017M622111. |
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| 摘 要： | Near-bottom currents play important roles in the formation and dynamics of deep-water sedimentary systems.This study examined the characteristics and temporal variations of near-bottom currents, especially the tidal components, based on two campaigns(2014 and 2016) of in situ observations conducted southeast of the Dongsha Island in the South China Sea. Results demonstrated near-bottom currents are dominated by tidal currents, the variance of which could account for ～70% of the total current variance. Diurnal tidal currents were found stronger than semidiurnal currents for both barotropic and baroclinic components. The diurnal tidal currents were found polarized with predominantly clockwise-rotating constituents, whereas the clockwise and counterclockwise constituents were found comparable for semidiurnal tidal currents. It was established that diurnal tidal currents could induce strong current shear. Baroclinic tidal currents showed pronounced seasonal variation with large magnitude in winter and summer and weak magnitude in spring and autumn in 2014. The coherent components accounted for ～65% and ～50% of the diurnal and semidiurnal tidal current variances,respectively. The proportions of the coherent and incoherent components changed little in different seasons. In addition to tidal currents, it was determined that the passing of mesoscale eddies could induce strong nearbottom currents that have considerable influence on the deep circulation.
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| 关 键 词： | 潮流 南海 底层流场 中尺度涡旋 |
| 收稿时间： | 2018/6/20 0:00:00 |
Characteristics and temporal variations of near-bottom currents near the Dongsha Island in the northern South China Sea |
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| Li Dawei,Wei Zexun,Wang Yonggang,Li Shujiang,Xu Tengfei,Wang Guanlin and Teng Fei.Characteristics and temporal variations of near-bottom currents near the Dongsha Island in the northern South China Sea[J].Acta Oceanologica Sinica,2019,38(4):80-89. |
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| Authors: | Li Dawei Wei Zexun Wang Yonggang Li Shujiang Xu Tengfei Wang Guanlin and Teng Fei |
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| Institution: | Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China |
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| Abstract: | Near-bottom currents play important roles in the formation and dynamics of deep-water sedimentary systems. This study examined the characteristics and temporal variations of near-bottom currents, especially the tidal components, based on two campaigns (2014 and 2016) of in situ observations conducted southeast of the Dongsha Island in the South China Sea. Results demonstrated near-bottom currents are dominated by tidal currents, the variance of which could account for~70% of the total current variance. Diurnal tidal currents were found stronger than semidiurnal currents for both barotropic and baroclinic components. The diurnal tidal currents were found polarized with predominantly clockwise-rotating constituents, whereas the clockwise and counterclockwise constituents were found comparable for semidiurnal tidal currents. It was established that diurnal tidal currents could induce strong current shear. Baroclinic tidal currents showed pronounced seasonal variation with large magnitude in winter and summer and weak magnitude in spring and autumn in 2014. The coherent components accounted for~65% and~50% of the diurnal and semidiurnal tidal current variances, respectively. The proportions of the coherent and incoherent components changed little in different seasons. In addition to tidal currents, it was determined that the passing of mesoscale eddies could induce strong near-bottom currents that have considerable influence on the deep circulation. |
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| Keywords: | tidal currents South China Sea near-bottom currents mesoscale eddies |
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