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Aquarius/SAC-D卫星,以实现海表盐度(Sea Surface Salinity,SSS)全球遥感观测为目标,经过算法的不断改进,迄今已发布第四版产品(V4)。已有的检验研究表明V1.3产品在全球最大的边缘海——中国南海的精度并未达到该产品的目标精度,主要原因是射频干扰(Radio Frequency Interference,RFI)的影响。新版数据在中国南海的精度是否有所提高,是一个值得探讨的问题。本研究通过比较南海走航盐度、Argo浮标盐度与Aquarius SSS V4及旧版产品的差异,发现Aquarius SSS V4与走航盐度及Argo浮标盐度的均方根误差(RMSE)分别为0.47和0.73,V4产品表现整体优于V3及之前的版本,特别是在南海北部近岸高RFI海域,V4产品的偏差也小于V3,说明V4产品中RFI的影响相较于V3产品在一定程度上得到了有效的去除。同时,分析表明Aquarius SSS V4产品所揭示的南海表层盐度空间分布与季节变动特征,与前人通过实测调查获得的结论基本一致。
The Aquarius / SAC-D satellite, which targets the global remote sensing of the Sea Surface Salinity (SSS), has so far released the fourth edition of the product (V4) as its algorithm continues to improve. The existing test results show that the accuracy of the V1.3 product in the world’s largest coastal sea-South China Sea does not reach the target accuracy of the product, mainly due to the influence of Radio Frequency Interference (RFI). Whether the accuracy of the new version of data in the South China Sea has been raised is a question worth exploring. In this study, we found that the root mean square error (RMSE) of Aquarius SSS V4 and salvage salinity and Argo buoy is 0.47 and 0.47, respectively, by comparing the salinity of the South China Sea, the salinity of the Argo buoy and the old Aquarius SSS V4 product, 0.73, V4 product performance overall better than the V3 and the previous version, especially in the northern coastal waters of the South China Sea high RFI waters, V4 product deviation is less than V3, indicating that the impact of V4 V4 products compared to the V3 products to some extent Effective removal. At the same time, the analysis shows that the spatial and seasonal variations of the surface salinity in the South China Sea revealed by the Aquarius SSS V4 product are basically the same as those obtained by previous surveys.