Intersatellite Calibration of Kalpana Thermal Infrared Channel Using AIRS Hyperspectral Observations

This letter presents the results from the intersatellite calibration of Kalpana observations using hyperspectral observations from the Atmospheric Infrared Sounder (AIRS). The intercalibration statistics have been generated for January, April, July, and October in 2009. Kalpana-observed brightness temperatures are found to be close to those of the AIRS observations with standard deviations of about 0.4 K during daytime and 0.3 K during nighttime. However, there are a large cold bias of 1.6 K in Kalpana observations during nighttime and a relatively small cold bias of 0.6 K during daytime. This calibration problem during nighttime is similar to that seen in the Geostationary Operational Environmental Satellites (GOES) infrared channels.