Developing Climate Data Records from Microwave Water Vapor Channels
This presentation first describes results of a comprehensive study on the geolocation correction for the observations from microwave instruments (AMSU-A, AMSU-B, and MHS) onobard NOAA satellites then discusses the bias correction and inter-calibration of the observations from water vapor channels of these instruments onboard NOAA and MetOp satellites. In terms of geolocation, several import errors was found including about one degree mounting offset for the NOAA-15 AMSU-A Channel 1 as well as a large timing error related to NOAA-17 AMSU-A observations. The calibration drift was investigated using tropical and polar averages and noticeable drift was found in NOAA-15 and NOAA-16 AMSU-B water vapor channels. The time series of the observations show significant improvement and consistency between multiple satellites after inter-calibration and bias correction.