| Summary: | China’s marine satellite infrared radiometer SST remote sensing observations began relatively late. Thus, it is essential to evaluate and correct the SST observation data of the Ocean Color and Temperature Scanner (COCTS) onboard the China HY-1C satellite in the Southeast Asia seas. We conducted a quality assessment and correction work on the SST of the China COCTS/HY-1C in Southeast Asian seas based on multisource satellite SST data and temperature data measured by Argo buoys. The accuracy evaluation results of the COCTS SST indicated that the <i>bias</i>, <i>Std</i>, and <i>RMSE</i> of the daytime SST data for HY-1C were −0.73 °C, 1.38 °C, and 1.56 °C, respectively, while the <i>bias</i>, <i>Std</i>, and <i>RMSE</i> of the nighttime SST data were −0.95 °C, 1.57 °C, and 1.83 °C, respectively. The COCTS SST accuracy was significantly lower than that of other infrared radiometers. The effect of the COCTS SST zonal correction was most significant, with the <i>Std</i> and <i>RMSE</i> approaching 1 °C. After correction, the <i>RMSE</i> of the daytime SST and nighttime SST data decreased by 32.52% and 42.04%, respectively.
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