Abstract
The temperature of the surface soil layer around different orientation walls was investigated horizontally along several construction-soil micro-gradients in Beijing, China. On a diurnal scale, similar fluctuating trends in T0 and T50 (temperature of surface soil layer, 0 and 0.5 m from the building baseline) adjacent to the external walls of buildings with the same orientation usually appeared under similar micrometeorological conditions. The difference between T0 and T50 (ΔT0–50) can be considered an indicator of the intensity of the horizontal heat effects: higher ΔT0–50 values correspond to greater intensities. The values of ΔT0–50 for south-, north-, east- and west-facing sides of buildings were highest on sunny days in summer and exhibited values of 6.61 K, 1.64 K, 5.93 K and 2.76 K, respectively. The scope of horizontal heat impacts (Sh) changed on a diurnal scale between zero and the maximum, which fluctuated with the micrometeorological conditions. The maximum values of Sh were 0.30, 0.15, 0.20 and 0.20 m for south-, north-, east-, and west-facing walls. The ΔT0–50 was related to solar radiation, horizontal heat flux, relative humidity, wind speed, soil moisture differences and air temperature; the relative importance of these factors was 36.22%, 31.80%, 19.19%, 2.67%, 3.68% and 6.44%, respectively.
Highlights
Heat transfer is another driving force in the changes in the distribution of soil temperatures within urban areas, except for the shading of buildings
Soil temperatures are directly linked to many ecosystem processes, such as soil heterotrophic respiration, microbial decomposition, nutrient cycling, and root respiration, which are influenced by soil temperature[26,27], which suggested that adjacent structures in urban areas affected these processes
This study aims to contribute to the understanding of the horizontal heat impacts of urban buildings on soil surface layer temperatures in the adjacent green space across different micrometeorological conditions created by the urban buildings themselves
Summary
Heat transfer is another driving force in the changes in the distribution of soil temperatures within urban areas, except for the shading of buildings. Menberg[21] and Benz[22] noted that heat flux from infrastructures was the main driving force to increase the temperature of shallow aquifers in urban areas These previous studies have confirmed that heat transfer occurs between buildings and the soil and that the buildings act as the heat source. This study aims to contribute to the understanding of the horizontal heat impacts of urban buildings on soil surface layer temperatures in the adjacent green space across different micrometeorological conditions created by the urban buildings themselves. This study focused on the diurnal pattern of horizontal heat impacts of urban structures on the temperature of the soil in green spaces adjacent to the buildings under various micrometeorological conditions in different weather situations and seasons
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