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Statistical Estimation of Precipitable Water With SIRS–B Water Vapor Radiation Measurements

WILLIAM C. SHENResearch Division, Control Data Corporation, Minneapolis, Minn.

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WILLIAM L. SMITHNational Environmental Satellite Service, NOAA, Hillcrest Heights, Md.

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Abstract

A multiple-parameter model has been formulated to estimate precipitable water profiles above the standard pressure levels from the satellite infrared spectrometer B (SIRS–B) radiation observations taken from the Nimbus 4 satellite. The method was verified with coincident radiosonde data. The relative error of SIRS-derived precipitable water above the 1000-mb level was approximately 20 percent. The 532-cm−1 water vapor channel alone explained 72 percent of the variance of the precipitable water. This method was used to specify the optimum SIRS–B spectral intervals for future water vapor sounding.

Abstract

A multiple-parameter model has been formulated to estimate precipitable water profiles above the standard pressure levels from the satellite infrared spectrometer B (SIRS–B) radiation observations taken from the Nimbus 4 satellite. The method was verified with coincident radiosonde data. The relative error of SIRS-derived precipitable water above the 1000-mb level was approximately 20 percent. The 532-cm−1 water vapor channel alone explained 72 percent of the variance of the precipitable water. This method was used to specify the optimum SIRS–B spectral intervals for future water vapor sounding.

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