Arid Zone Research ›› 2022, Vol. 39 ›› Issue (2): 388-399.doi: 10.13866/j.azr.2022.02.06

• Weather and Climate • Previous Articles     Next Articles

Analysis of the spatial and temporal differences in surface temperature and the contribution of surface coverage in the urban agglomeration on the northern slope of the Tianshan Mountains

LIANG Hongwu1(),Alimujiang Kasim1,2(),ZHAO Hemiao1,ZHAO Yongyu1   

  1. 1. College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, Xinjiang, China
    2. Research Center for Urbanization Development of Silk Road Economic Belt, Xinjiang Normal University, Urumqi 830054, Xinjiang, China
  • Received:2021-08-21 Revised:2021-10-08 Online:2022-03-15 Published:2022-03-30
  • Contact: Kasim Alimujiang E-mail:Brown_liang@163.com;alimkasim@xjnu.edu.cn

Abstract:

The acceleration of urbanization has intensified land use changes, which in turn has led to increasingly prominent urban thermal environmental problems. Based on MYD21A2 surface temperature data from the summers of 2005 and 2018, the spatial and temporal distribution pattern of LST was analyzed using spatial statistics, combined with land use data, and the contribution index was used to determine the source of land cover types and administrative divisions of the urban agglomeration on the northern slope of the Tianshan Mountains. Between 2005 and 2018, construction land, cultivated land increased significantly, and natural resource types, such as glaciers and forest land, decreased significantly, indicating that urban development had a serious impact on the ecological environment and natural resources. The spatial distribution of surface temperature grades is negatively correlated with altitude; from 2005 to 2018, the spatial distribution of high temperature grades in the daytime has a discretization trend, while the opposite is true at night, and the overall spatial distribution of high temperature grades at night has a tendency to migrate to the southeast. Different cities and land cover types had different day/night source and sink roles due to different natural conditions, specific heat capacity, and other physical properties; these can be summarized as a day and night heat source type (CI > 0), a day and night sink type (day CI < 0, night CI > 0), and a day and night heat sink type (CI < 0). The unique climate and desert-oasis-mountain landforms of the urban agglomeration on the northern slope of the Tianshan Mountains led to a diurnal sink and night source land for construction land, with the role of source and sink being different from that of some inland urban agglomerations (Beijing-Tianjin-Hebei urban agglomeration).

Key words: MYD21A2, urban agglomeration on the northern slope of Tianshan Mountains, land surface temperature, contribution