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The influence of anisotropic diffuse shortwave radiation on mean radiant temperature in outdoor urban environments

Artikel i vetenskaplig tidskrift
Författare Nils Wallenberg
Fredrik Lindberg
Björn Holmer
Sofia Thorsson
Publicerad i Urban Climate
Volym 31
ISSN 2212-0955
Publiceringsår 2020
Publicerad vid Institutionen för geovetenskaper
Språk en
Länkar https://doi.org/10.1016/j.uclim.202...
Ämneskategorier Meteorologi och atmosfärforskning, Klimatforskning, Fysisk geografi

Sammanfattning

During clear weather conditions the main part of the shortwave irradiance derives from sun direct-beam radiation. However, part of the shortwave radiation also originates from all-sky diffuse radiation (D), with a large part being circumsolar in origin. Many radiation models considers the sky as isotropic when estimating D. Here we implement an anisotropic model for D into the SOLWEIG model to examine the spatial patterns of D in a built-up environment, as well as its influence on mean radiant temperature (Tmrt), a variable essential for estimating outdoor human thermal comfort. Comparisons between the anisotropic and the isotropic models indicates that the D in the isotropic model is overestimated in shaded areas and underestimated in areas close to sunlit walls. This is explained by the circumsolar origin of D during clear and semi-cloudy conditions and solar altitude. These over- and underestimations, consecutively, have implications for Tmrt, which can differ by up to 3 °C. The deviations in D thus signify the importance of using an anisotropic model when estimating D and Tmrt, especially since the areas with the highest reported radiant loads receive even more radiation considering an anisotropic diffuse sky, i.e. the hottest areas are even hotter than previously reported.

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