1. College of Geographic and Environmental Science, Northwest Normal University, Lanzhou 730070, China 2. School of Geographic Science, Nanjing Normal University, Nanjing 210023, China 3. Yunnan Map World Information Technology Stock Co., Ltd., Kunming 650034,China
The study of the changing pattern of urban thermal environment from different spatial scales can provide a scientific reference for the construction of urban human settlements. On the basis of MODIS and Landsat TM/OLI/TIRS data, land surface temperature is retrieval. Spatial pattern of thermal field in Lanzhou-Xining agglomeration (LXA) was analyzed from macro scale and micro scale. Diurnal variation, seasonal variation, and annual variation of urban heat island effect of LXA were explored. The heat island ratio index was introduced to describe the variation characteristics of thermal field pattern in LXA from 1992 to 2015. The results show that, on the large scale, there is no obvious urban heat island effect in LXA, whereas the spatial pattern of urban heat island effect in internal areas of central urban region of Lanzhou and Xining-Haidong changed greatly from 1992 to 2015. The urban sprawl had a spatial consistency with the urban heat island extension. Specifically, the heat island ratio index first increased and then decreased in central urban area of Lanzhou, whereas the heat island ratio index continuously increased significantly in central urban area of Xining-Haidong. As a typical valley agglomeration, the temperature of central cities was lower than that of surrounding loess hilly regions. The main influence factors were vegetation and the duration and amount of solar radiation. It seems that the land surface temperature is negatively correlated with normalized difference vegetation index(NDVI) and positively correlated with normalized difference building index(NDBI).
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2018, Vol. 30 
), 董磊磊1, 王娜云2, 杨紫金3
