關(guān)于內(nèi)波的躍層譜表達法、自適應(yīng)識別和MODIS應(yīng)用
[Abstract]:In this paper, the whole water layer profile spectral expression of marine cline is proposed. The vertical variation process and characteristics of the cline are fully, systemically, completely and accurately highlighted by the vertical variation gradient zero line and distribution curve of ocean elements. By using the curvature region maximum and wavelet transform adaptive detection method, the transition feature of the peak-peak of the cline layer is extracted, and the boundary between the cline layer and the upper and lower layer water body is determined. Thus, a 5.3 element method is formed to characterize the characteristics of the natural attributes of the cline, namely, the upper boundary of the cline, the upper boundary of the strong cline, the maximum value of the cline, the lower bound of the strong cline, the lower bound of the cline, and the maximum strength of the cline. The average strength of the strong cline and the average strength of the cline are three elements of the strength of the cline. Based on this, a set of systematic methods for the definition, expression, determination and identification of clines are established. Using this method, the characteristics of the northern South China Sea cline are analyzed by using the EN4 (Levitus) thermohaline profile reanalysis data. Based on the 2014 MODIS optical remote sensing data, the distribution characteristics of the internal waves and their inversion parameters in the South China Sea are obtained. The results show that the internal waves in the South China Sea are mainly distributed in the west of the Basse Strait to the east sand, Liuhua and other sea areas, the Pearl River Estuary and the 200 meters deep and shallow continental shelf slope break area. Its distribution coincides with the three major sources of the internal waves in the South China Sea, namely, the Basi Strait region, the Pearl River Estuary region and the continental shelf slope break area. The occurrence of internal waves in the South China Sea shows obvious seasonal variation, with the highest frequency in summer, followed by spring and autumn, and the least in winter. There is a significant correlation between the intensity of sea water stratification and the intensity of the South China Sea cline in summer, followed by spring and autumn, and the weakest in winter. The amplitude of internal wave ranges from several meters to hundreds of meters in the northern South China Sea. During the propagation of internal waves from Luzon Strait to the west, the velocity of internal waves in the northern South China Sea decreases continuously. The internal wave length of the northern South China Sea ranges from several hundred meters to several kilometers, and the wavelength decreases gradually during the propagation of the internal wave from the Bash Strait to the west.
【學位授予單位】:國家海洋局第一海洋研究所
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:P731.24
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