Validation of an urban canyon radiation model for nocturnal long-wave fluxes
✍ Scribed by J. A. Voogt; T. R. Oke
- Publisher
- Springer
- Year
- 1991
- Tongue
- English
- Weight
- 899 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0006-8314
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✦ Synopsis
The urban canyon radiation model of Arnfield (1976. 19X2) i\ validated using measurements of long-wa\e fluxes taken within a scaled down urban canyon constructed from concrete building blocks. A custom-designed traversing system allowed miniature radiometers to be automatically moved around the perimeter of a canyon cross-section. thereby pro,iding for the validation of individual model grid-points. The agreement between measured and modelled radiation is generally very good. Some differences between the two over the canyon walls are attrihutcd to difficultic+ in achieving precise instrument orientation.
Model results derived from the measured surface temperature data are compared to results using various approximation schemes more likely to be used in practice. Approximation+ based on canyon surface temperatures are <uperior to those using air tcmpernturc.