基于MODIS图像的内孤立波信息反演——以南海北部深水区为例

Information of Internal Solitary Wave Extracted from MODIS Image:a Case in the Deep Water of Northern South China Sea

卫星遥感技术是探测海洋内孤立波的重要手段,目前提取内孤立波特征参数的工作均使用SAR图像。本文首次探讨了基于MODIS可见光图像的内孤立波信息反演方法,并对位于南海北部水深3 000m左右的内孤立波个例进行了研究,发现其振幅为124m,传播速度为3.14m/s,半波宽度为3 258m。根据潜标现场观测结果对反演得到的内孤立波信息进行了检验,结果表明,此方法具有较高的准确度,为研究南海北部深水区内孤立波提供了一条新的可行路径。

Satellite remote sensing technique is an effects tool in investigating the internal solitary wave （ISW） in the ocean, and the information of ISW can be inferred from the SAR image. In this paper, the characteristic parameters of a typical ISW occurred in the deep water of northern South China Sea （SCS） were firstly extracted from the MODIS image. It was shown that the ISW propagated at a speed of 3.14 m/s, with an amplitude of 124 m and a characteristic half width of 3258 m, which agreed well with the mooring observation result. Our results demonstrated that the information of the ISW in the deep water of northern SCS can be inferred from the MODIS image with acceptable accuracy, and it provided a new method to study the ISW in the SCS.