Physical retrieval of surface emissivity spectrum from hyperspectral infrared radiances
Article first published online: 23 AUG 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 16, 28 August 2007
How to Cite
2007), Physical retrieval of surface emissivity spectrum from hyperspectral infrared radiances, Geophys. Res. Lett., 34, L16812, doi:10.1029/2007GL030543., , , and (
- Issue published online: 23 AUG 2007
- Article first published online: 23 AUG 2007
- Manuscript Accepted: 30 JUL 2007
- Manuscript Revised: 25 JUL 2007
- Manuscript Received: 9 MAY 2007
 Retrieval of temperature, moisture profiles and surface skin temperature from hyperspectral infrared (IR) radiances requires spectral information about the surface emissivity. Using constant or inaccurate surface emissivities typically results in large temperature and moisture profile errors, particularly over semi-arid or arid areas where the variation in emissivity is large both spectrally and spatially. A physically based algorithm has been developed to retrieve a hyperspectral IR emissivity spectrum simultaneously with the temperature and moisture profiles, as well as the surface skin temperature. To make the solution stable and efficient, the hyperspectral emissivity spectrum is represented by eigenvectors, derived from the laboratory measured hyperspectral emissivity database, in the retrieval process. Experience with Atmospheric InfraRed Sounder (AIRS) radiances shows that simultaneous retrieval of the emissivity spectrum and the sounding improves the surface skin temperature and temperature and moisture profiles, particularly in the near surface layer.