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Intercomparison of Three Microwave/Infrared High Resolution Line-by-Line Radiative Transfer Codes

Schreier, Franz and Milz, Mathias and Buehler, Stefan A and Clarmann von, Thomas (2018) Intercomparison of Three Microwave/Infrared High Resolution Line-by-Line Radiative Transfer Codes. Journal of Quantitative Spectroscopy and Radiative Transfer, 211, pp. 64-77. Elsevier. doi: 10.1016/j.jqsrt.2018.02.032. ISSN 0022-4073.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0022407317309445


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.

Item URL in elib:https://elib.dlr.de/119682/
Document Type:Article
Title:Intercomparison of Three Microwave/Infrared High Resolution Line-by-Line Radiative Transfer Codes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schreier, Franzfranz.schreier (at) dlr.dehttps://orcid.org/0000-0001-7196-6599
Milz, MathiasLulea University of Technology, Division of Space Technology, Kiruna, Swedenhttps://orcid.org/0000-0002-4478-2185
Buehler, Stefan AUniv. Hamburghttps://orcid.org/0000-0001-6389-1160
Clarmann von, ThomasKIT, Karlsruhehttps://orcid.org/0000-0003-2219-3379
Date:May 2018
Journal or Publication Title:Journal of Quantitative Spectroscopy and Radiative Transfer
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jqsrt.2018.02.032
Page Range:pp. 64-77
EditorsEmailEditor's ORCID iD
Bernath, PeterOld Dominion University, Norfolk, Virginia, USAUNSPECIFIED
Mengüç, M. PinarÖzyeğin University, Istanbul, TurkeyUNSPECIFIED
Mishchenko, Michael I.NASA-Goddard Institute for Space Studies, New York, USAUNSPECIFIED
Keywords:Line-by-line; Infrared; HIRS channels; Garand atmospheres; Intercomparisons
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):Vorhaben Spectroscopic Methods in Remote Sensing (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Schreier, Dr.rer.nat. Franz
Deposited On:19 Apr 2018 11:48
Last Modified:06 Sep 2019 15:28

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