Microwave land emissivity calculations using AMSU measurements

• Published in: IEEE transactions on geoscience and remote sensing Vol. 43; no. 5; pp. 948 - 959
• Main Authors: Karbou, F., Prigent, C., Eymard, L., Pardo, J.R.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01.05.2005; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Acoustic testing; Advanced Microwave Sounding Unit (AMSU); Africa; Applied geophysics; Atmospheric measurements; Atmospherics; Beams (radiation); Channels; Earth Sciences; Earth, ocean, space; Emissivity; Environmental Sciences; Exact sciences and technology; Extrapolation; Geophysics; Global Changes; Internal geophysics; Land; Land surface; Land surface temperature; Mathematical analysis; Measurement units; Microwave measurements; microwave surface emissivity; Moisture; Moisture measurement; Physics; Retrieval; Sciences of the Universe; South America; South America; microwaves; Advanced Microwave Sounding Unit (AMSU); extrapolation; channels; Eurasia; NOAA; Space remote sensing; Africa; temperature; asymmetry; microwave surface emissivity
• ISSN: 0196-2892; 1558-0644
• DOI: 10.1109/TGRS.2004.837503

Atmospheric parameter retrievals over land from Advanced Microwave Sounding Unit (AMSU) measurements, such as atmospheric temperature and moisture profiles, could be possible using a reliable estimate of the land emissivity. The land surface emissivities have been calculated using six months of data, for 30 beam positions (observation zenith angles from -58/spl deg/ to +58/spl deg/) and the 23.8-, 31.4-, 50.3-, 89-, and 150-GHz channels. The emissivity calculation covers a large area including Africa, Eurasia, and Eastern South America. The day-to-day variability of the emissivity is less than 2% in these channels. The angular and spectral dependence of the emissivity is studied. The obtained AMSU emissivities are in good agreement with the previously derived SSMI ones. The scan asymmetry problem has been evidenced for AMSU-A channels. And possible extrapolation of the emissivity from window channels to sounding ones has been successfully tested.