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Influence of Urban Spatial Morphology on Air Temperature Variance


Affiliations
1 College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
2 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
3 School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, China
 

Urban spatial geometric morphology is one of the key factors that results in air temperature variance between urban and suburban sites or at different urban positions. Considering the Adelaide central urban area of South Australia as study area and using urban digital elevation model (DEM) data with a high spatial resolution and field measurement meteorological data, this study estimated the sky view factor (SVF), frontal area index (FAI), and accumulated absorbed solar irradiation (AASI) from the land surface; these parameters were used to discuss the influence of the land surface on air temperature and urban heat island (UHI) under a optimal scale. The results indicate that urban spatial morphological parameters of the visually neighbouring positions display an obvious effect on the spatial-temporal air temperature variance. The degree of influence of AASI on air temperature variance during daytime increases with the solar elevation angle. A difference was noted between the influence of SVF and FAI on the urban heat island at different times in summer and winter, in which the influence of SVF and FAI on nocturnal UHI is more significant, whereas the relationship during daytime is complex.

Keywords

Air Temperature, Frontal Area Index, Solar Irradiation, Sky View Factor, Urban Heat Island.
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  • Influence of Urban Spatial Morphology on Air Temperature Variance

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Authors

Guixin Zhang
College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China
Zhenchun Hao
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
Shanyou Zhu
School of Geography and Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, China

Abstract


Urban spatial geometric morphology is one of the key factors that results in air temperature variance between urban and suburban sites or at different urban positions. Considering the Adelaide central urban area of South Australia as study area and using urban digital elevation model (DEM) data with a high spatial resolution and field measurement meteorological data, this study estimated the sky view factor (SVF), frontal area index (FAI), and accumulated absorbed solar irradiation (AASI) from the land surface; these parameters were used to discuss the influence of the land surface on air temperature and urban heat island (UHI) under a optimal scale. The results indicate that urban spatial morphological parameters of the visually neighbouring positions display an obvious effect on the spatial-temporal air temperature variance. The degree of influence of AASI on air temperature variance during daytime increases with the solar elevation angle. A difference was noted between the influence of SVF and FAI on the urban heat island at different times in summer and winter, in which the influence of SVF and FAI on nocturnal UHI is more significant, whereas the relationship during daytime is complex.

Keywords


Air Temperature, Frontal Area Index, Solar Irradiation, Sky View Factor, Urban Heat Island.

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DOI: https://doi.org/10.18520/cs%2Fv110%2Fi4%2F619-626