title: Influence of ground surface characteristics on the mean radiant temperature in urban areas.
abstract: The effect of variations in land cover on mean radiant temperature (T mrt ) 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 T mrt is small compared to the effects of shadowing. Nevertheless, altering ground surface materials could contribute to a reduction in T mrt 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 T mrt 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.
authors: Göteborg Urban Climate Group, Earth Science Centre, University of Gothenburg, Box 460, SE-405 30, Gothenburg, Sweden. fredrikl@gvc.gu.se.
authors: Fredrik
authors: F
authors: Lindberg
authors: Göteborg Urban Climate Group, Earth Science Centre, University of Gothenburg, Box 460, SE-405 30, Gothenburg, Sweden.
authors: Shiho
authors: S
authors: Onomura
authors: Department of Meteorology, University of Reading, Earley Gate, PO Box 243, RG6 6BB, Reading, UK.
authors: C S B
authors: CS
authors: Grimmond
mesh_terms: D006838:Hydrocarbons; D008131:London; D008962:Models, Theoretical; D006109:Poaceae; D013472:Sunlight; D013696:Temperature; D014867:Water
chemical_list: D006838:Hydrocarbons; D014867:Water; C006647:asphalt
keywords: Gothenburg; London; SOLWEIG; Surface temperature