Influence of ground surface characteristics on the mean radiant temperature in urban areas

Fredrik Lindberg, Shiho Onomura, C. S.B. Grimmond

研究成果: Article査読

46 被引用数 (Scopus)

抄録

The effect of variations in land cover on mean radiant temperature (Tmrt) is explored through a simple scheme developed within the radiation model SOLWEIG. Outgoing longwave radiation is parameterised using surface temperature observations on a grass and an asphalt surface, whereas outgoing shortwave radiation is modelled through variations in albedo for the different surfaces. The influence of ground surface materials on Tmrt is small compared to the effects of shadowing. Nevertheless, altering ground surface materials could contribute to a reduction in Tmrt to reduce the radiant load during heat-wave episodes in locations where shadowing is not an option. Evaluation of the new scheme suggests that despite its simplicity it can simulate the outgoing fluxes well, especially during sunny conditions. However, it underestimates at night and in shadowed locations. One grass surface used to develop the parameterisation, with very different characteristics compared to an evaluation grass site, caused Tmrt to be underestimated. The implications of using high temporal resolution (e.g. 15 minutes) meteorological forcing data under partly cloudy conditions are demonstrated even for fairly proximal sites.

本文言語English
ページ(範囲)1439-1452
ページ数14
ジャーナルInternational Journal of Biometeorology
60
9
DOI
出版ステータスPublished - 1 9月 2016

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