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Atmosphere 2018, 9(10), 402; https://doi.org/10.3390/atmos9100402

The Street Air Warming Phenomenon in a High-Rise Compact City

1
Shenzhen Institutes of Advanced Technology, CAS Joint Engineering Research Center for Health Big Data Intelligent Analysis Technology, Shenzhen 518052, China
2
Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China
3
Development strategy Center, China Academy of Building Research, Beijing 100013, China
4
Aviation Weather Services Branch, Hong Kong Observatory, Hong Kong, China
5
Department of Geography, The Hong Kong Polytechnic University, Hong Kong, China
*
Author to whom correspondence should be addressed.
Received: 15 June 2018 / Revised: 8 October 2018 / Accepted: 9 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Urban Design and City Microclimates)
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Abstract

The street thermal environment is important for thermal comfort, urban climate and pollutant dispersion. A 24-h vehicle traverse study was conducted over the Kowloon Peninsula of Hong Kong in summer, with each measurement period consisting of 2–3 full days. The data covered a total of 158 loops in 198 h along the route on sunny days. The measured data were averaged by three methods (direct average, FFT filter and interpolated by the piecewise cubic Hermite interpolation). The average street air temperatures were found to be 1–3 °C higher than those recorded at nearby fixed weather stations. The street warming phenomenon observed in the study has substantial implications as usually urban heat island (UHI) intensity is estimated from measurement at fixed weather stations, and therefore the UHI intensity in the built areas of the city may have been underestimated. This significant difference is of interest for studies on outdoor air temperature, thermal comfort, urban environment and pollutant dispersion. The differences were simulated by an improved one-dimensional temperature model (ZERO-CAT) using different urban morphology parameters. The model can correct the underestimation of street air temperature. Further sensitivity studies show that the building arrangement in the daytime and nighttime plays different roles for air temperature in the street. City designers can choose different parameters based on their purpose. View Full-Text
Keywords: vehicle traverse experiments; street air temperature; air temperature model; street warming vehicle traverse experiments; street air temperature; air temperature model; street warming
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Wang, X.; Li, Y.; Yang, X.; Chan, P.W.; Nichol, J.; Li, Q. The Street Air Warming Phenomenon in a High-Rise Compact City. Atmosphere 2018, 9, 402.

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