This study assesses the accuracy and the applicability of the Korteweg-de Vries(KdV)and the nonlinear Schr?dinger(NLS)equation solutions to derivation of dynamic parameters of internal solitary waves(ISWs)from satellite images.Visible band images taken by five satellite sensors with spatial resolutions from 5 m to 250 m near the Dongsha Atoll of the northern South China Sea(NSCS)are used as a baseline.From the baseline,the amplitudes of ISWs occurring from July 10 to 13,2017 are estimated by the two approaches and compared with concurrent mooring observations for assessments.Using the ratio of the dimensionless dispersive parameter to the square of dimensionless nonlinear parameter as a criterion,the best appliable ranges of the two approaches are clearly separated.The statistics of total 18 cases indicate that in each 50％of cases,the KdV and the NLS approaches give more accurate estimates of ISW amplitudes.It is found that the relative errors of ISW amplitudes derived from two theoretical approaches are closely associated with the logarithmic bottom slopes.This may be attributed to the nonlinear growth of ISW amplitudes as propagating along a shoaling thermocline or topography.The test results using three consecutive satellite images to retrieve the ISW propagation speeds indicate that the use of multiple satellite images(＞2)may improve the accuracy of retrieved phase speeds.Meanwhile,repeated multi-satellite images of ISWs can help to determine the types of ISWs if mooring data are available nearby.

Huarong Xie;Qing Xu;Quanan Zheng;Xuejun Xiong;Xiaomin Ye;Yongcun Cheng

Key Laboratory of Marine Hazards Forecasting of Ministry of Natural Resources,Hohai University,Nanjing 210098,China;College of Marine Technology,Faculty of Information Science and Engineering,Ocean University of China,Qingdao 266100,China;Department of Atmospheric and Oceanic Science,University of Maryland,College Park,Maryland 20742,USA;First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China;National Satellite Ocean Application Service,State Oceanic Administration,Beijing 100081,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;PIESAT Information Technology Co.,Ltd.,Beijing 100195,China

海洋学报（英文版）

[1]Huarong Xie;Qing Xu;Quanan Zheng;Xuejun Xiong;Xiaomin Ye;Yongcun Cheng-.Assessment of theoretical approaches to derivation of internal solitary wave parameters from multi-satellite images near the Dongsha Atoll of the South China Sea)[J].海洋学报（英文版）,2022(06):137-145

Dongsha,appliable

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