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Title of Journal: Int J Biometeorol

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Abbravation: International Journal of Biometeorology

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Springer-Verlag

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DOI

10.1007/978-3-642-14363-2_5

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1432-1254

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SOLWEIG 10 – Modelling spatial variations of 3D r

Authors: Fredrik Lindberg Björn Holmer Sofia Thorsson
Publish Date: 2008/06/04
Volume: 52, Issue: 7, Pages: 697-713
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Abstract

The mean radiant temperature Tmrt which sums up all shortwave and longwave radiation fluxes both direct and reflected to which the human body is exposed is one of the key meteorological parameters governing human energy balance and the thermal comfort of man In this paper a new radiation model SOLWEIG 10 which simulates spatial variations of 3D radiation fluxes and Tmrt in complex urban settings is presented The Tmrt is derived by modelling shortwave and longwave radiation fluxes in six directions upward downward and from the four cardinal points and angular factors The model requires a limited number of inputs such as direct diffuse and global shortwave radiation air temperature relative humidity urban geometry and geographical information latitude longitude and elevation The model was evaluated using 7 days of integral radiation measurements at two sites with different building geometries – a large square and a small courtyard in Göteborg Sweden 57°N – across different seasons and in various weather conditions The evaluation reveals good agreement between modelled and measured values of Tmrt with an overall good correspondence of R 2 = 094 p  001 RMSE = 48 K SOLWEIG 10 is still under development Future work will incorporate a vegetation scheme as well as an improvement of the estimation of fluxes from the four cardinal pointsFinancial support for this project was provided by FORMAS the Swedish Research Council for Environment Agricultural Sciences and Spatial Planning in their key action area Urban Public Places Thanks to Ingegärd Eliasson and Sven Lindqvist who supervised the project and to Alexander Walther for programming support

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