Inter-calibration of infrared channels of FY-2/VISSR using highspectral resolution sensors IASI and AIRS
FY-2静止卫星红外通道的高光谱交叉定标

Inter-calibration method for infrared channels of geostationary satellite FY-2/VISSR is introduced using the highspectral resolution sounder (HSRS) as a reference onboard a polar orbit satellite, i.e., METOP/IASI or AQUA/AIRS. Analyses on its reliability were performed based on FY-2E historical data since 2009. The results indicate that inter-calibration results based on the two independent sensors IASI and AIRS have a good consistency between them, and the mean blackbody temperature (TBB) bias of HSRS inter-calibration is about 0.07 K with standard deviation of 1.4 K, which proves that there is no systematic bias and the distribution of TBB bias is approximately normal. Thereinto, the mean TBB bias is approximately less than 0.2 K and 1 K when TBB is great than 290 K and 220 K, respectively, and is about 0.3 K at a lower temperature. Comparing with the operational calibration provided in the Level1 f iles, HSRS inter-calibration shows obviously improvements. Longtime statistic analyses demonstrate the HSRS inter-calibration method studied here is stable and reliable, and its accuracy can meet the requirement in quantitative applications.