Development of a correlated-k distribution band model scheme for the radiative transfer program GOMETRAN/SCIATRAN for retrieval of atmospheric constituents from SCIMACHY/ENVISAT-1 data

Michael Buchwitz; Vladimir V. Rozanov; John P. Burrows

doi:10.1117/12.332681

14 December 1998 Development of a correlated-k distribution band model scheme for the radiative transfer program GOMETRAN/SCIATRAN for retrieval of atmospheric constituents from SCIMACHY/ENVISAT-1 data

Michael Buchwitz, Vladimir V. Rozanov, John P. Burrows

Author Affiliations +

Proceedings Volume 3495, Satellite Remote Sensing of Clouds and the Atmosphere III; (1998) https://doi.org/10.1117/12.332681
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

GOMETRAN/SCIATRAN is a radiative transfer forward model developed for retrieval of atmospheric trace gas concentrations, aerosol and cloud parameters, and surface reflectance from the spectral radiance measurements of the SCIAMACHY/ENVISAT-1 and GOME/ERS-2 UV-Vis-NIR multichannel spectrometers. For radiative transfer modeling of the line absorptions of O₂, H₂O, CO₂, CH₄, N₂O, and CO, tow different schemes are under development: an accurate but rather slow line-by-line (LBL) implementation and a significantly faster correlated-k (c-k) distribution scheme. The c-k scheme has been matched to the resolution of the instruments, which is channel dependent. In spectral regions free of overlapping line-absorbers the multiply scattered radiance calculated with both, the LBL and the c-k scheme, agrees within 1-2 percent. Calculations in c-k mode are a factor of 25-800 faster depending on spectral interval. Good agreement has been found with the MODTRAN/DISORT radiative transfer model. First results concerning a new method are presented indicating that overlapping line-absorbers can be modeled with similar accuracy and speed as single line-absorbers.

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Michael Buchwitz, Vladimir V. Rozanov, and John P. Burrows "Development of a correlated-k distribution band model scheme for the radiative transfer program GOMETRAN/SCIATRAN for retrieval of atmospheric constituents from SCIMACHY/ENVISAT-1 data", Proc. SPIE 3495, Satellite Remote Sensing of Clouds and the Atmosphere III, (14 December 1998); https://doi.org/10.1117/12.332681

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