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contributor authorPéquignot, E.
contributor authorChédin, A.
contributor authorScott, N. A.
date accessioned2017-06-09T16:18:23Z
date available2017-06-09T16:18:23Z
date copyright2008/06/01
date issued2008
identifier issn1558-8424
identifier otherams-65414.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4206637
description abstractAtmospheric Infrared Sounder (AIRS; NASA Aqua platform) observations over land are interpreted in terms of monthly mean surface emissivity spectra at a resolution of 0.05 ?m and skin temperature. For each AIRS observation, an estimation of the atmospheric temperature and water vapor profiles is first obtained through a proximity recognition within the thermodynamic initial guess retrieval (TIGR) climatological library of about 2300 representative clear-sky atmospheric situations. With this a priori information, all terms of the radiative transfer equation are calculated by using the Automatized Atmospheric Absorption Atlas (4A) line-by-line radiative transfer model. Then, surface temperature is evaluated by using a single AIRS channel (centered at 12.183 ?m) chosen for its almost constant emissivity with respect to soil type. Emissivity is then calculated for a set of 40 atmospheric windows (transmittance greater than 0.5) distributed over the AIRS spectrum. The overall infrared emissivity spectrum at 0.05-?m resolution is finally derived from a combination of high-spectral-resolution laboratory measurements of various materials carefully selected within the Moderate-Resolution Imaging Spectroradiometer/University of California, Santa Barbara (MODIS/UCSB) and Advanced Spaceborne Thermal Emission and Reflection Radiometer/Jet Propulsion Laboratory (ASTER/JPL) emissivity libraries. It is shown from simulations that the accuracy of the method developed in this paper, the multispectral method (MSM), varies from about 3% around 4 ?m to considerably less than 1% in the 10?12-?m spectral window. Three years of AIRS observations (from April 2003 to March 2006) between 30°S and 30°N have been processed and interpreted in terms of monthly mean surface skin temperature and emissivity spectra from 3.7 to 14.0 ?m at a spatial resolution of 1° ? 1°. AIRS retrievals are compared with the MODIS (also flying aboard the NASA/Aqua platform) monthly mean L3 products and with the University of Wisconsin Cooperative Institute for Meteorological Satellite Studies baseline-fit method (UW/CIMSS BF) global infrared land surface emissivity database.
publisherAmerican Meteorological Society
titleInfrared Continental Surface Emissivity Spectra Retrieved from AIRS Hyperspectral Sensor
typeJournal Paper
journal volume47
journal issue6
journal titleJournal of Applied Meteorology and Climatology
identifier doi10.1175/2007JAMC1773.1
journal fristpage1619
journal lastpage1633
treeJournal of Applied Meteorology and Climatology:;2008:;volume( 047 ):;issue: 006
contenttypeFulltext


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