利用FY-4B地球静止气象卫星观测南海北部内孤立波及传播速度  

Observation and propagation velocity study of internal solitary waves in the northern South China Sea based on the FY-4B geostationary meteorological satellite

作　　者：李熙莹 孟俊敏 孙丽娜 张昊 贺凯飞[2] Li Xiying;Meng Junmin;Sun Li’na;Zhang Hao;He Kaifei(First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China;College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao 266580,China;Technology Innovation Center for Ocean Telemetry,Ministry of Natural Resources,Qingdao 266061,China)

机构地区：[1]自然资源部第一海洋研究所,山东青岛266061 [2]中国石油大学(华东)海洋与空间信息学院,山东青岛266580 [3]自然资源部海洋遥测技术创新中心,山东青岛266061

出　　处：《海洋学报》2024年第7期1-15,共15页

基　　金：国家自然科学基金项目(U2006207,42006164)。

摘　　要：本文利用中国新一代静止轨道气象卫星FY-4B数据开展了南海北部海域内孤立波观测及传播速度研究。首先使用500 m分辨率的全圆盘ARGI数据对FY-4B卫星可观测内波区域进行了讨论,确认了南海北部为研究区域。之后利用250 m分辨率的GHI数据使用多时相图像比较法(Multitemporal Image Comparison Method,MTI)计算了南海北部内孤立波的传播速度,其平均传播速度为1.78 m/s,东部深海区平均传播速度为3.02 m/s,向西传播至东沙群岛附近后平均速度减小至1.90 m/s,经过东沙群岛分裂后南部比北部传播速度更快,分别为2.08 m/s和1.54 m/s;最终在向西传播到近岸区域后内孤立波传播速度减小至0.42 m/s,直至最终消散。将MTI方法与两层模式下扩展KdV方程(extended Korteweg-de Vries,eKdV)计算得到的理论传播速度进行了对比,二者相关系数达到了0.89,证明eKdV理论方程对南海北部内孤立波传播速度反演的可行性,但仍具有一定的局限。最后将实测数据与遥感影像匹配计算内孤立波传播速度的结果与单一遥感影像计算内孤立波传播速度的结果进行了比较,两者相关性达到了0.93。本文验证了静止轨道卫星光学遥感数据的高时间分辨率特点对内孤立波传播速度研究具有的较大优势,对南海北部内孤立波参数反演等研究工作具有一定意义。This study uses the data of the China’s new generation geostationary-orbit meteorological satellite FY-4B to observe the internal solitary wave(ISW)and study the propagation speed of ISW in the northern South China Sea(NSCS).Firstly,the observable ISW region of the FY-4B satellite was discussed by using ARGI data of 500 m resolution,and the NSCS was confirmed as the research area.Then,the MTI method(Multitemporal Image Comparison method)was used to calculate the propagation velocity of ISWs in NSCS using GHI data of 250 m resolution,and the average propagation velocity of ISW in NSCS is about 1.78 m/s.The average velocity in the eastern deep sea was 3.02 m/s,and it decreased to 1.90 m/s after westward transmission near Dongsha Islands.After the division of Dongsha Islands,the velocity of ISW in the south was faster than the north,with 2.08 m/s and 1.54 m/s,respectively.Finally,the velocity decreases to 0.42 m/s after westward to the nearshore region,then dissipates.Compared with the results of the MTI method and theoretical propagation velocity calculated by the eKdV(extended Korteweg-de Vries)equation in the two-layer mode,and the correlation coefficient between them reached 0.89.Prove the feasibility of using the eKdV theoretical equation to invert the propagation velocity of ISW in the NSCS.Finally,the results of calculating the propagation velocity of ISW by combining measured data with remote sensing images were compared with the results of MTI method.The correlation between the two reached 0.93.This article verifies the high temporal resolution characteristics of geostationary-orbit optical remote sensing data,which have significant advantages in calculating the propagation speed of ISW.It has certain significance for research work such as inversion of ISW parameters in the NSCS.

关 键 词：内孤立波 FY-4B地球静止气象卫星 多时相图像比较法(MTI) eKdV方程 南海北部 

分 类 号：P715.6[天文地球—海洋科学]