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Intercomparison of three microwave/infrared high resolution line-by-line radiative transfer codes
DLR, Remote Sensing Technology Institute, 82234 Oberpfaffenhofen.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.ORCID iD: 0000-0002-4478-2185
Universität Hamburg, Meteorological Institute.
KIT — Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research.
2018 (English)In: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 211, p. 64-77Article in journal (Refereed) Published
Abstract [en]

An intercomparison of three line-by-line (lbl) codes developed independently for atmospheric radiative transfer and remote sensing – ARTS, GARLIC, and KOPRA – has been performed for a thermal infrared nadir sounding application assuming a HIRS-like (High resolution Infrared Radiation Sounder) setup. Radiances for the 19 HIRS infrared channels and a set of 42 atmospheric profiles from the “Garand dataset” have been computed.

The mutual differences of the equivalent brightness temperatures are presented and possible causes of disagreement are discussed. In particular, the impact of path integration schemes and atmospheric layer discretization is assessed. When the continuum absorption contribution is ignored because of the different implementations, residuals are generally in the sub-Kelvin range and smaller than 0.1 K for some window channels (and all atmospheric models and lbl codes). None of the three codes turned out to be perfect for all channels and atmospheres. Remaining discrepancies are attributed to different lbl optimization techniques. Lbl codes seem to have reached a maturity in the implementation of radiative transfer that the choice of the underlying physical models (line shape models, continua etc) becomes increasingly relevant.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 211, p. 64-77
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
URN: urn:nbn:se:ltu:diva-67821DOI: 10.1016/j.jqsrt.2018.02.032ISI: 000432100500007OAI: oai:DiVA.org:ltu-67821DiVA, id: diva2:1187145
Note

Validerad;2018;Nivå 2;2018-03-23 (rokbeg)

Available from: 2018-03-02 Created: 2018-03-02 Last updated: 2018-06-08Bibliographically approved

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Milz, Mathias

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