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Unified ground and cloud emissivity temperature seperation technique

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Abstract

Knowledge of the surface, ground or cloud, emissivity is essential for remote sensing parameters retrieval, radiation balance study, and satellite data assimilation. Emissivity in infrared spectral region, which measures a surface’s ability to radiate energy, is the vital link in remote sensing of actual ground or cloud surface temperature. By taking advantage of high-spectral resolution semi-continuous spectral measurements provided by interferometer or grating spectrometer, the unified ground/cloud emissivity temperature separation technique will be demonstrated to separate spectral independent temperature and spectral dependent emissivity of the ground and cloud surfaces. Besides ground and cloud emissivity spectrum, their respected actual temperature, and their corresponding surface pressure can also be determined. There is a reasonable hope that, due to this recent exploration and the availability of high-spectral resolution infrared measurements, the improved usage of the global satellite infrared radiances under cloudy and over non-water areas can be achieved in the near future.

© 2003 Optical Society of America

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