Impact of Anthropogenic Heat on Surface Balanceof Energy and Water in Beijing
2020
Anthropogenic heat (AH) is an important part of
urban surface energy balance. Although AH affects regional climates
through changing land-atmosphere interactions, the climate forcing from
AH are not usually calculated in state-of-the-art regional climate
simulations. In this paper, the spatial pattern of AH in 20 automatic
weather station sites in the Beijing municipal administrative area is
parameterized by employing nighttime light data. Two experiments were
designed and performed to quantify the influence of AH on the surface
balance of energy and water through running the Integrated urban Land
Model (IUM). The results show that due to accounting for AH, the
simulated LST increases; the net radiation decreases around noon; the
absolute value of the ground heat flux increases around noon; the
sensible heat flux increases in the daytime; the evapotranspiration
decreases around noon and increases in the morning and evening;
volumetric soil moisture and soil water storage decrease; aggregated
evapotranspiration increases.
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