The impact of surface characteristics on ambient temperature at urban micro scale: Comparative field study in two climates

This paper presents the results of two field studies to examine the differences in ambient temperatures in a micro-scale environment (at distances of 50-200 m between measuring points) in two different climates during typical summer weather conditions at two similar sites in terms of construction and activities. The analysis considered the land use around the measuring locations split into three categories (built, green and open) as well as climatic conditions and studied the effect of these on ambient temperature at each measuring location. It was found that, similarly to macro-scale studies at the urban level, measuring locations with a higher green cover have a lower ambient temperature compared with measuring locations with a higher built and/or open land cover. The results provide measured evidence in two different climates that small green areas distributed within the urban environment can provide a reduction in the ambient temperature thus contributing to the mitigation of urban heat island.The work is supported by the Capes Foundation, Ministry of Education of Brazil. The experimental work in Uxbridge was supported by the Engineering and Physical Science Research Council of the UK (EPSRC Grant No EP/E016308/1)