Abstract
The aim of this study is to analyse the thermal properties of natural and artificial urban surfaces and the impact of surface colours and shading. Measuring campaigns were conducted in spring and summer (2018-2019) in the district XI of Budapest to determine the surface temperature of various urban materials. The results show that the coolest surfaces are natural covers (water, vegetation), while the hottest surfaces are concrete pavements, asphalt and rubber paving when exposed to direct solar radiation. Moreover, among concrete pavements, light coloured surfaces warm up 5-6 °C less on average compared to dark coloured surfaces. The use of rubber paving may be disadvantageous from the urban climatological point of view, as these surfaces become extremely hot under sunny conditions.
Highlights
It is a well-known fact that in urban areas, human activities result in special climatic conditions
Common statistical tools are performed, i.e. box-and-whiskers diagrams to represent the distribution of surface temperature measurements over a specific surface cover, averaging available measurements to compare different types of surface covers, etc
Even if the surface is exposed to direct sunlight, and absorbs more radiation than from diffuse sunlight only, their surface temperature remains close to the values in case of shaded conditions
Summary
It is a well-known fact that in urban areas, human activities result in special climatic conditions. In the framework of a long-term cooperation between the Urban Climate Research Group of the Department of Meteorology at the Eötvös Loránd University (Budapest) and the Department of Environment at the Municipality of Újbuda (district XI of Budapest), regular urban climate measurements are carried out in the district XI of Budapest to detect the urban heat island (UHI) effect on different spatial scales. Measuring campaigns were conducted in July 2018 and later, in May and June 2019 to determine the surface temperature of various urban materials using an infrared thermometer. The purpose of these measurements was to obtain information about the thermal properties of different urban surfaces, objects (covering materials, walls, pavements, etc.) in order to analyse which surfaces are suitable for decreasing and mitigating the UHI effect. The impact of the colour of different surfaces and the role of shading are analysed as well
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