Intercomparison of radiative transfer codes under non-local thermodynamic equilibrium conditions

T. Von Clarmann, A. Dudhia, D. P. Edwards, B. Funke, M. Höpfner, B. Kerridge, V. Kostsov, A. Linden, M. López-Puertas, Yu Timofeyev

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25 Scopus citations


Limb infrared spectra calculated by the Optimized and Precise Radiative Transfer Algorithm (KOPRA), GENLN2, Reference Forward Model (RFM), and Simulation Program for Infrared Radiative Transfer (SPIRT) radiative transfer algorithms were intercompared for both local thermodynamic equilibrium (LTE) and non-local thermodynamic equilibrium (non-LTE) conditions, in the latter case for given profiles of vibrational temperatures. The overall agreement is usually better than approximately 0.5%, except for isolated phenomena that have been assessed in more detail. Most spectral radiance discrepancies occur also under LTE conditions and are attributed to different treatment of far wings of lines, integration schemes, and mass-weighted averaging of atmospheric temperature and pressure along slant path segments as well as different spectral sampling during the calculation of monochromatic radiances.

Original languageEnglish
Article number4631
JournalJournal of Geophysical Research Atmospheres
Issue number22
StatePublished - 1 Jan 2002

Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Ecology
  • Aquatic Science
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Paleontology


  • 1610 Global change: atmosphere (0315, 0325)
  • 1640 Global change: remote sensing
  • 3210 Mathematical geophysics: modeling


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