Abstract
Daily 5-km sea surface temperature (SST) data from the Visible and Infrared Scanning Radiometer (VIRR) onboard the Fengyun-3C (FY-3C) satellite are evaluated for latitudes greater than 60° N against in situ and daily 4-km SST data from the Moderate Resolution Imaging Spectroradiometer (MODIS) onboard the Terra satellite. Approximately five months of data are used for the evaluation, during August to December 2014. The in situ and 4-km MODIS SST data are averaged and resampled at a spatial resolution of 5 km, which is similar to that of the VIRR SST data. The bias and standard deviation of the SST difference between VIRR and buoy data are −0.12 °C and 0.93 °C, respectively. A three-way error analysis is conducted between VIRR, MODIS, and buoy SSTs to obtain standard deviations of error for each kind of observation. The separated standard deviations of the error are found to be 0.91 °C for the VIRR SST, 0.20 °C for the in situ SST, and 0.51 °C for the MODIS SST. The error sources are discussed. The results indicate that the FY-3C/VIRR SST product needs to be improved.
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