An inter-comparison of far-infrared line-by-line radiative transfer models

David P. Kratz, Martin G. Mlynczak, Christopher J. Mertens, Helen Brindley, Larry L. Gordley, Javier Martin-Torres, Ferenc M. Miskolczi, David D. Turner

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

A considerable fraction (>40%) of the outgoing longwave radiation escapes from the Earth's atmosphere-surface system within a region of the spectrum known as the far-infrared (wave-numbers less than 650 cm-1). Dominated by the line and continuum spectral features of the pure rotation band of water vapor, the far-infrared has a strong influence upon the radiative balance of the troposphere, and hence upon the climate of the Earth. Despite the importance of the far-infrared contribution, however, very few spectrally resolved observations have been made of the atmosphere for wave-numbers less than 650 cm-1. The National Aeronautics and Space Administration (NASA), under its Instrument Incubator Program (IIP), is currently developing technology that will enable routine, space-based spectral measurements of the far-infrared. As part of NASA's IIP, the Far-Infrared Spectroscopy of the Troposphere (FIRST) project is developing an instrument that will have the capability of measuring the spectrum over the range from 100 to 1000 cm-1 at a resolution of 0.6 cm-1. To properly analyze the data from the FIRST instrument, accurate radiative transfer models will be required. Unlike the mid-infrared, however, no inter-comparison of codes has been performed for the far-infrared. Thus, in parallel with the development of the FIRST instrument, an investigation has been undertaken to inter-compare radiative transfer models for potential use in the analysis of far-infrared measurements. The initial phase of this investigation has focused upon the inter-comparison of six distinct line-by-line models. The results from this study have demonstrated remarkably good agreement among the models, with differences being of order 0.5%, thereby providing a high measure of confidence in our ability to accurately compute spectral radiances in the far-infrared.

Original languageEnglish
Pages (from-to)323-341
Number of pages19
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume90
Issue number3-4
DOIs
Publication statusPublished - Feb 1 2005
Externally publishedYes

Fingerprint

Radiative transfer
radiative transfer
troposphere
Infrared radiation
Troposphere
infrared spectroscopy
Infrared spectroscopy
Earth atmosphere
NASA
aeronautics
radiance
escape
climate
water vapor
confidence
Steam
continuums
atmospheres
radiation
Earth (planet)

Keywords

  • Far-infrared
  • FIRST
  • Inter-comparison
  • Line-by-line

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

Cite this

An inter-comparison of far-infrared line-by-line radiative transfer models. / Kratz, David P.; Mlynczak, Martin G.; Mertens, Christopher J.; Brindley, Helen; Gordley, Larry L.; Martin-Torres, Javier; Miskolczi, Ferenc M.; Turner, David D.

In: Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 90, No. 3-4, 01.02.2005, p. 323-341.

Research output: Contribution to journalArticle

Kratz, DP, Mlynczak, MG, Mertens, CJ, Brindley, H, Gordley, LL, Martin-Torres, J, Miskolczi, FM & Turner, DD 2005, 'An inter-comparison of far-infrared line-by-line radiative transfer models', Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 90, no. 3-4, pp. 323-341. https://doi.org/10.1016/j.jqsrt.2004.04.006
Kratz, David P. ; Mlynczak, Martin G. ; Mertens, Christopher J. ; Brindley, Helen ; Gordley, Larry L. ; Martin-Torres, Javier ; Miskolczi, Ferenc M. ; Turner, David D. / An inter-comparison of far-infrared line-by-line radiative transfer models. In: Journal of Quantitative Spectroscopy and Radiative Transfer. 2005 ; Vol. 90, No. 3-4. pp. 323-341.
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