The Influence of Underlying Surface on Land Surface Temperature - A Case Study of Urban Green Space in Harbin

In recent years, the expansion of Harbin's main urban area, the capital city of a northeast province in china, has resulted in the increase of impervious surface, the decrease of green space and the significant change of urban thermal environment. In order to further reveal the comprehensive effects of underlying surface especially green space and impervious surface on urban thermal environment in the severe cold region, this paper adopts remote sensing technology to extract and analyze the Landsat spectral imaging data of Harbin's main urban area in summers and winters from 2004 to 2015, and thus puts forward the regulations of effects of different underlying surface types on land surface temperature (EST). It is found that a large amount of permeable underlying surface like green space in Harbin has been continuously transformed into impervious surface, which has led to a continuous rise of urban land surface temperature in recent years. Urban green space plays a certain role in improving urban thermal environment in both summers and winters. We can fmd especial rules on the distribution of the urban loops and the cooling ranges in summers. As for winters, under the influence of the main heat source and the cooling mode, there is no remarkable regularity. (C) 2019 The Authors. Published by Elsevier Ltd.