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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2014, Vol. 11, No. 3, pp. 278-287

New versions of spectroscopic databases and remote sensing of the Earth using high-resolution IR spectroscopy

G.E. Kolokutin1 , B.A. Fomin1 
1 Central Aerological Observatory, Dolgoprudny, Russia
Nadir high-resolution IR sensors’ data processing is based on comparison of the experimental and simulated spectra of outgoing thermal radiation. But, as validation experiments demonstrate, at present the agreement between these spectra are not good, that can considerably decrease efficiency of remote sensing. A reason may be the set of uncertainties in the contemporary spectroscopic data being used in the line-by-line spectral calculations: the line shape models (especially the far wings), continua (by water vapor, oxygen etc.), line mixing models (for carbon dioxide, methane, etc.). That is why the spectroscopic databases are regularly upgraded, especially the most popular GEISA and HITRAN, where one can find information about the spectral lines positions, strengths and half-widths.
The typical uncertainties in the line-by-line simulations of the IR spectra of outgoing radiations when using different spectroscopic databases HITRAN-2008, GEISA-2011 and HITRAN-2012 are evaluated. By using the JAIVEx data for the IASI sensor it is shown that the newest databases GEISA-2011 and HITRAN-2012 do not remove discrepancies between experimental and simulated spectra found earlier when the HITRAN-2008 database was used in calculations.
Keywords: radiation, IR spectra, line-by-line calculations, spectroscopic databases
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