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Explicit validation of a surface shortwave radiation balance model over snow‐covered complex terrain

Helbig, N. and Löwe, H. and Mayer, B. and Lehning, M. (2010) Explicit validation of a surface shortwave radiation balance model over snow‐covered complex terrain. Journal of Geophysical Research, 115 (D18113), pp. 1-12. DOI: 10.1029/2010JD013970.

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Official URL: http://www.agu.org/journals/jd/jd1018/2010JD013970/2010JD013970.pdf

Abstract

A model that computes the surface radiation balance for all sky conditions in complex terrain is presented. The spatial distribution of direct and diffuse sky radiation is determined from observations of incident global radiation, air temperature, and relative humidity at a single measurement location. Incident radiation under cloudless sky is spatially derived from a parameterization of the atmospheric transmittance. Direct and diffuse sky radiation for all sky conditions are obtained by decomposing the measured global radiation value. Spatial incident radiation values under all atmospheric conditions are computed by adjusting the spatial radiation values obtained from the parametric model with the radiation components obtained from the decomposition model at the measurement site. Topographic influences such as shading are accounted for. The radiosity approach is used to compute anisotropic terrain reflected radiation. Validations of the shortwave radiation balance model are presented in detail for a day with cloudless sky. For a day with overcast sky a first validation is presented. Validation of a section of the horizon line as well as of individual radiation components is performed with high‐quality measurements. A new measurement setup was designed to determine terrain reflected radiation. There is good agreement between the measurements and the modeled terrain reflected radiation values as well as with incident radiation values. A comparison of the model with a fully three‐dimensional radiative transfer Monte Carlo model is presented. That validation reveals a good agreement between modeled radiation values

Document Type:Article
Title:Explicit validation of a surface shortwave radiation balance model over snow‐covered complex terrain
Authors:
AuthorsInstitution or Email of Authors
Helbig, N.WSL Inst. for Snow and Avalanche Research SLF, Davos, CH
Löwe, H.WSL Inst. for Snow and Avalanche Research SLF, Davos, CH
Mayer, B.LMU / DLR
Lehning, M.WSL Inst. for Snow and Avalanche Research SLF, Davos, CH
Date:2010
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:115
DOI:10.1029/2010JD013970
Page Range:pp. 1-12
Status:Published
Keywords:sky radiation
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):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Jana Freund
Deposited On:26 Oct 2010 11:27
Last Modified:23 Jan 2014 11:36

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