利用高精度和稳定的AIRS/Aqua(Atmospheric InfraRed Sounder on board Aqua)数据对SVISSR/FY- 2C(Stretched Visible and Infrared Spin Scan Radiometer onboard FengYun 2C)的两个分裂窗通道IR1(InfraRed 1, 10.9 μm)和IR2(InfraRed 2, 11.9μm)进行交叉辐射定标的方法, 并利用赤道附近2006年12月和2007年12月的AIRS和SVISSR数据完成了交叉辐射定标, 结果表明, SVISSR数据与卷积得到的AIRS数据高度线性相关, SVISSR/FY-2C传感器的两个分裂窗通道不仅存在定标误差, 而且定标误差随时间的变化呈现增大的趋势。相对于AIRS/Aqua测量值, 当SVISSR的通道亮温从220 K变化到340 K时, 2006年12月IR1通道的温度调整量从5.8 K变化到-4.4 K, 而2007年12月IR1通道的温度调整量从6.9 K变化到-5.1 K; 2006年12月IR2通道的温度调整量从2.2 K变化到-1.5 K, 而2007年12月IR2通道的温度调整量从6.3 K变化到-6.1 K。

This paper addresses the intercalibration of the two split-window channels IR1 (10.9μm) and IR2 (11.9μm) of SVISSR (Stretched Visible and Infrared Spin Scan Radiometer) onboard the geostationary satellite FY-2C (FengYun 2C) against the most accurate and stable AIRS (Atmospheric Infrared Sounder) sensor onboard the polar-orbit satellite Aqua. The intercalibration was implemented using both the AIRS and SVISSR data around the equator in December of 2006 and 2007. The results reveal that: (1) the SVISSR data are highly linearly correlated with the convolved AIRS data, (2) calibration errors exist in SVISSR channels IR1 and IR2, and (3) the discrepancies become larger with time increment. With respect to the AIRS/Aqua measurements, when the brightness temperatures in SVISSR channels change from 220K to 340K, the temperature adjustment for IR1 in Dec., 2006 varies from 5.8K to -4.4K, and changes from 6.9K to -5.1K in Dec., 2007; The temperature adjustment for IR2 in Dec., 2006 goes from 2.2K to -1.5K, and varies from 6.3K to -6.1K in Dec., 2007.