Wednesday 31 January 2024


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Sea Surface Temperature Retrieval from HY-1C and HY-1D COCTS in the South China Sea

The Haiyang-1C (HY-1C) and Haiyang-1D (HY-1D) satellites are two operational ocean observation satellites. The HY-1C and HY-1D satellites form the morning and afternoon satellite networking, which improves the spatial and temporal coverage capacity. The Chinese Ocean Color and Temperature Scanner (COCTS) on the HY-1C/D satellites provides observation of the sea surface temperature (SST) by two thermal channels centered on 10.8 µm and 12.0 µm. The South China Sea has the characteristics of high water vapor and high SST. In this study, regional algorithms were developed based on radiative transfer modeling. The atmospheric profiles suitable for the South China Sea were selected. The relationship between the skin SST and simulated brightness temperature (BT) of the selected profiles was established, and the algorithm was used to derive the HY-1C/D COCTS SST in the South China Sea. The HY-1C/COCTS SST was compared with the SST from the Sea and Land Surface Temperature Radiometer (SLSTR) onboard Sentinel-3. The bias was −0.07°C, and the standard deviation was 0.50 °C. The HY-1D/COCTS SST was compared with the SST from the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard NOAA-20. The bias was −0.04 °C, and the standard deviation was 0.53 °C. The average difference of the HY-1C and HY-1D COCTS SST was 0.38 °C in the daytime, and 0.03 °C in the nighttime, which was consistent with the characteristics of diurnal warming in the region.

About Zhuomin Li

Zhuomin Li received the M.S. degree in photogrammetry and remote sensing from the Ocean University of China (2021). She is currently pursuing the Ph.D. degree in marine technology, Ocean University of China.
Zhuomin Li’s research interests include sea surface temperature retrieval and validation from satellite infrared observations.

Watch Zhuomin’s GHRSST Talk