| Internal solitary waves in the East China Sea |
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| 作者姓名： | LI Xiaofeng ZHAO Zhongxiang HAN Zhen XU Liuxiong |
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| 作者单位： | Joint Center for Ocean Remote Sensing and Living Marine Resources Management, Shanghai Fisheries University, Shanghai 200090, China;NOAA E/RA3, WWBG, Camp Springs, MD 20746, USA;Applied Physics Laboratory, University of Washington, Seattle, WA 98105, USA;Joint Center for Ocean Remote Sensing and Living Marine Resources Management, Shanghai Fisheries University, Shanghai 200090, China;Joint Center for Ocean Remote Sensing and Living Marine Resources Management, Shanghai Fisheries University, Shanghai 200090, China |
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| 摘 要： | A European Space Agency＇ s ENVISAT advanced synthetic aperture radar （ASAR） image covering Zhejiang coastal water in the East China Sea （ECS） was acquired on 1 August 2007. This image shows that there are about 20 coherent internal solitary wave （ISW） packets propagating southwestward toward Zhejiang coast. These ISW packets are separated by about 10 kin, suggesting that these ISWs are tide-generated waves. Each ISW packet contains 5-15 wave crests. The wavelengths of the wave crests within the ISW packets are about 300 m. The lengths of the leading wave crests are about 50 km. The ISW amplitude is estimated from solving KdV equation in an ideal two-layer ocean model. It is found that the ISW amplitudes is about 8 m. Further analysis of the ASAR image and ocean stratification profiles show that the observed ISWs are depression waves. Analyzing the tidal current finds that these waves are locally generated. The wavelength and amplitude of the ECS ISW are much smaller than their counter- parts in the South China Sea （SCS）. The propagation speed of the ECS ISW is also an order of magnitude smaller than that of the SCS ISW. The observed ISWs in the ECS happened during a spring tide period.
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| 关 键 词： | SAR 内部波 东海 海洋学 |
| 收稿时间： | 2007/7/20 0:00:00 |
| 修稿时间： | 2008/2/29 0:00:00 |
Internal solitary waves in the East China Sea |
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| LI Xiaofeng,ZHAO Zhongxiang,HAN Zhen,XU Liuxiong.Internal solitary waves in the East China Sea[J].Acta Oceanologica Sinica,2008,27(3):51-59. |
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| Authors: | LI Xiaofeng ZHAO Zhongxiang HAN Zhen and XU Liuxiong |
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| Institution: | 1.Joint Center for Ocean Remote Sensing and Living Marine Resources Management, Shanghai Fisheries University, Shanghai 200090, China;NOAA E/RA3, WWBG, Camp Springs, MD 20746, USA2.Applied Physics Laboratory, University of Washington, Seattle, WA 98105, USA3.Joint Center for Ocean Remote Sensing and Living Marine Resources Management, Shanghai Fisheries University, Shanghai 200090, China |
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| Abstract: | A European Space Agency's ENVISAT advanced synthetic aperture radar (ASAR) image covering Zhejiang coastal water in the East China Sea (ECS) was acquired on 1 August 2007. This image shows that there are about 20 coherent internal solitary wave (ISW) packets propagating southwestward toward Zhejiang coast. These ISW packets are separated by about 10 kin, suggesting that these ISWs are tide-generated waves. Each ISW packet contains 5--15 wave crests. The wavelengths of the wave crests with-in the ISW packets are about 300 m. The lengths of the leading wave crests are about 50 km. The ISW amplitude is estimated from solving KdV equation in an ideal two-layer ocean model. It is found that the ISW amplitudes is about 8 m. Further analysis of the ASAR image and ocean stratification profiles show that the observed ISWs are depression waves. Analyzing the tidal current finds that these waves are locally generated. The wavelength and amplitude of the ECS ISW are much smaller than their counter-parts in the South China Sea (SCS). The propagation speed of the ECS ISW is also an order of magnitude smaller than that of the SCS ISW. The observed ISWs in the ECS happened during a spring tide period. |
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| Keywords: | SAR Internal wave East China Sea |
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