Intercalibration of microwave sounding unit with short overlaps
نویسنده
چکیده
NOAA/NESDIS/Center for Satellite Applications and Research has been reprocessing and recalibrating the Microwave Sounding Unit (MSU) observations to generate atmospheric temperature dataset with climate quality. So far, observations from the MSU channels 2, 3, and 4 for NOAA 10, 11, 12, and 14 have been recalibrated using a recently-developed SNO (simultaneously nadir overpasses) sequential nonlinear calibration technique and a 20-year long deep-layer atmospheric temperature dataset from 1987 to 2006 has been generated. However, when using the SNO nonlinear technique to intercalibrate the MSU instrument for satellites before NOAA 10, one has to deal with the short overlap issue for satellites between NOAA 9 and NOAA 10. In this study, by extending the spatial distance criterion for the SNO matchups, we generate more SNO samplings for the short-overlapping satellites. We analyze the error characteristics of the SNO matchups when the spatial distance is extended to as large as 650km. We also generate calibration coefficients using the SNO nonlinear sequential intercalibration technique and then analyze how the intercalibration affects the SNO biases with different separation distances. These analyses will be helpful in determining the final calibration coefficients used for generating consistent MSU long-term temperature time series that will include all available satellites.
منابع مشابه
Error Structure and Atmospheric Temperature Trends in Observations from the Microwave Sounding Unit
The Microwave Sounding Unit (MSU) onboard the National Oceanic and Atmospheric Administration polar-orbiting satellites measures the atmospheric temperature from the surface to the lower stratosphere under all weather conditions, excluding precipitation. Although designed primarily for monitoring weather processes, the MSU observations have been extensively used for detecting climate trends, an...
متن کاملAssessment of intercalibration methods for satellite microwave humidity sounders
[1] Three methods for intercalibrating humidity sounding channels are compared to assess their merits and demerits. The methods use the following: (1) natural targets (Antarctica and tropical oceans), (2) zonal average brightness temperatures, and (3) simultaneous nadir overpasses (SNOs). Advanced Microwave Sounding Unit-B instruments onboard the polar-orbiting NOAA 15 and NOAA 16 satellites ar...
متن کاملComparison of Simulated Radiances, Jacobians and Information Content for the Microwave Humidity Sounder and the Advanced Microwave Sounding Unit–B
The Microwave Humidity Sounder (MHS) has similar scan characteristics to the Advanced Microwave Sounding Unit-B (AMSU-B). However, the radiometric characteristics are somewhat different, particularly for two channels. Both of these channels will sense somewhat deeper into the atmosphere for the MHS than the AMSU-B. The MHS also has higher information content than the AMSU-B due to its improved ...
متن کامل