HY1C/1D海表温度对Terra/Aqua产品的可替代性分析

通过卫星遥感获取的海表温度（SST）产品已经成为海洋和大气研究中的重要数据源，我国海洋水色遥感卫星（HY1C和HY1D）的海洋水色水温扫描仪（COCTS）具有两个热红外通道，可反演全球SST遥感产品。对比Terra和Aqua卫星的中分辨率成像光谱仪（MODIS）的SST产品，分析COCTS海表温度产品对MODIS相应产品的可替代性。比较了两种卫星的全球SST单日和月平均融合产品的图像空间结构，分析了匹配像元SST值的离散度，统计了HY1C/1D的误差结果，讨论了HY1C与HY1D产品的一致性、不同质量控制方案对SST产品影响以及遥感产品质量对昼夜SST变化研究影响等问题。结果表明，以2020年6月SST(Terra)为真值，HY1C白天SST的单日全球遥感产品的平均偏差、绝对偏差、均方根误差和相关系数分别为0.04℃、0.60℃、0.78℃和0.98，夜晚SST的单日全球遥感产品的平均偏差、绝对偏差、均方根误差和相关系数分别为-0.16℃、0.78℃、0.95℃和0.86。以2020年6月SST(Aqua)为真值，HY1D白天SST的单日全球遥感产品的平均偏差、绝对偏差、均方根误差和相...

Consistent analysis of sea surface temperature products between HY1C/1D and Terra/Aqua

The sea surface temperature (SST) products, obtained from the Chinese Ocean Color and Temperature Scanner (COCTS) on the two haiyang satellites (HY1C and HY1D), play an important role in oceanic and atmospheric researches. It is important to know whether they are consistent with products from other satellites such as the Moderate Resolution Imaging Spectroradiometer (MODIS) on Terra and Aqua satellites. The data quality of SST global images from COCTS on HY1C/1D is evaluated by the average bias, absolute difference, root mean square error, and correlation coefficient based on in-situ SST measurements and the MODIS products. The results show that the spatial patterns of the daily and monthly global SST of HY1C/1D are similar to those of Terra/Aqua. The average bias, absolute difference, root mean square error and correlation coefficient of the global daily SST/HY1C products at daytime, based on the SST values of Terra on June 2020, are 0.04℃, 0.60℃, 0.78℃ and 0.98, respectively, and that of the nighttime products are ?0.16℃, 0.78℃, 0.95℃ and 0.86, respectively. Similarly, the values of the daytime SST products of HY1D comparing with the SST of Aqua on June 2020 are 0.02℃, 0.59℃, 0.79℃ and 0.98, and that of the nighttime products are ?0.09℃, 0.61℃, 0.82℃ and 0.96, respectively. The evaluation on other seasons indicates that the SST products from COCTS are very stable. However, the data quality control scheme and inhomogeneity correction still need to be developed to improve the performance of SST products of HY1C/1D. As a whole, the SST products of HY1C/1D can be used in some applications, similar to the Terra/Aqua products.