Evaluation of FYV3C/VIRR thermal infrared channel calibration in the Arctic
Sea surface temperature(SST)in the Arctic can control the growth of sea ice,the melting of ice and snow,and the exchange of surface atmosphere energy.Global temperature changes are ampli-fied in the Arctic.Therefore,monitoring Arctic SST is important for studying global climate change.The brightness temperature of the thermal infrared channel of the satellite sensor can be used to re-trieve SST,and its accuracy plays a vital role in the accuracy of SST.This paper took the Arctic as re-search area to evaluate the calibration accuracy of the Visible and Infrared Scanning Radiometer(VIRR)thermal infrared channels(11μm and 12μm channels)mounted on the FY-3C satellite.The reference sensor was Moderate-resolution Imaging Spectroradiometer(MODIS).Because the spectrum of VIRR and MODIS are different,this paper used the atmospheric radiation transfer model MODT-RAN(MODerate resolution atmospheric TRANsmission)to calculate the simulated brightness temper-ature of VIRR and MODIS.The sea surface parameters and atmospheric parameters,the sea surface emissivity,the satellite zenith angle and the spectral response curve corresponding to the two channels of VIRR and MODIS were input into MODTRAN to obtain the simulated brightness temperature,and then the spectral difference of VIRR and MODIS was obtained.Based on the difference of observed brightness temperature and spectral difference,the average deviation of the 11μm channel was-0.41K,the standard deviation was 0.26K,the average deviation of the 12μm was-0.47K and the standard deviation was 0.30K during the day.The average deviation of the 11μm channel was-0.35K,the standard deviation was 0.21K,the average deviation of the 12μm channel was-0.44K,and the standard deviation was 0.22K at night.It showed that the calibration accuracy of VIRR thermal infrared channel was high in the Arctic.
VIRRMODISthermal infrared channelatmospheric radiation transfer simulation
NETL
NSTL
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