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Energy exchange in a dense urban environment Part II: impact of spatial heterogeneity of the surface

Kotthaus, S. and Grimmond, C. S. B. (2014) Energy exchange in a dense urban environment Part II: impact of spatial heterogeneity of the surface. Urban Climate, 10 (2). pp. 281-307. ISSN 2212-0955

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To link to this article DOI: 10.1016/j.uclim.2013.10.001

Abstract/Summary

The centre of cities, characterised by spatial and temporal complexity, are challenging environments for micrometeorological research. This paper considers the impact of sensor location and heterogeneity of the urban surface on flux observations in the dense city centre of London, UK. Data gathered at two sites in close vicinity, but with different measurement heights, were analysed to investigate the influence of source area characteristics on long-term radiation and turbulent heat fluxes. Combining consideration of diffuse radiation and effects of specular reflections, the non-Lambertian urban surface is found to impact the measurements of surface albedo. Comparisons of observations from the two sites reveal that turbulent heat fluxes are similar under some flow conditions. However, they mostly observe processes at different scales due to their differing measurement heights, highlighting the critical impact of siting sensors in urban areas. A detailed source area analysis is presented to investigate the surface controls influencing the energy exchanges at the different scales

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:36104
Publisher:Elsevier

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