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Intercomparison of general purpose clear sky atmospheric radiative transfer models for the millimeter/submillimeter spectral range

Melsheimer, Christian and Verdes, Carmen and Buehler, Stefan and Emde, Claudia and Eriksson, Patrick and Feist, Dietrich and Ichizawa, Shunsuke and Johns, Viju and Kasai, Yasuko and Kopp, Gerhard and Koulev, Nikolay and Kuhn, Thomas and Lemke, Oliver and Ochiai, Satoshi and Schreier, Franz and Sreerekha, T. R. and Suzuki, Makoto and Takahashi, Chikako and Tsujimaru, Sho and Urban, Joachim (2005) Intercomparison of general purpose clear sky atmospheric radiative transfer models for the millimeter/submillimeter spectral range. Radio Science, Vol. 40 (1), RS1007-doi:10.1029/2004RS003110.

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Abstract

We compare a number of radiative transfer models for atmospheric sounding in the millimeter and submillimeter wavelength range, check their consistency, and investigate their deviations from each other. This intercomparison deals with three different aspects of radiative transfer models: (1) the inherent physics of gaseous absorption lines and how they are modeled, (2) the calculation of absorption coefficients, and (3) the full calculation of radiative transfer for different geometries, i.e., up-looking, down-looking, and limb-looking. The correctness and consistency of the implementations are tested by comparing calculations with predefined input such as spectroscopic data, line shape, continuum absorption model, and frequency grid. The absorption coefficients and brightness temperatures calculated by the different models are generally within about 1% of each other. Furthermore, the variability or uncertainty of the model results is estimated if (except for the atmospheric scenario) the input such as spectroscopic data, line shape, and continuum absorption model could be chosen freely. Here the models deviate from each other by about 10% around the center of major absorption lines. The main cause of such discrepancies is the variability of reported spectroscopic data for line absorption and of the continuum absorption model. Further possible causes of discrepancies are different frequency and pressure grids and differences in the corresponding interpolation routines, as well as differences in the line shape functions used, namely a prefactor of (í/í0) or (í/í0)2 of the Van-Vleck-Weisskopf line shape function. Whether or not the discrepancies affect retrieval results remains to be investigated for each application individually.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Intercomparison of general purpose clear sky atmospheric radiative transfer models for the millimeter/submillimeter spectral range
Authors:
AuthorsInstitution or Email of Authors
Melsheimer, ChristianUNSPECIFIED
Verdes, CarmenUNSPECIFIED
Buehler, StefanUNSPECIFIED
Emde, ClaudiaUNSPECIFIED
Eriksson, PatrickUNSPECIFIED
Feist, DietrichUNSPECIFIED
Ichizawa, ShunsukeUNSPECIFIED
Johns, VijuUNSPECIFIED
Kasai, YasukoUNSPECIFIED
Kopp, GerhardUNSPECIFIED
Koulev, NikolayUNSPECIFIED
Kuhn, ThomasUNSPECIFIED
Lemke, OliverUNSPECIFIED
Ochiai, SatoshiUNSPECIFIED
Schreier, FranzUNSPECIFIED
Sreerekha, T. R.UNSPECIFIED
Suzuki, MakotoUNSPECIFIED
Takahashi, ChikakoUNSPECIFIED
Tsujimaru, ShoUNSPECIFIED
Urban, JoachimUNSPECIFIED
Date:2005
Journal or Publication Title:Radio Science
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:Vol. 40
Page Range:RS1007-doi:10.1029/2004RS003110
Status:Published
Keywords:radiative transfer model; microwave; intercomparison
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: Cornelia Roehl
Deposited On:08 Feb 2006
Last Modified:06 Jan 2010 22:39

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