宿州市城市热岛效应的时空变化分析

Temporal and Spatial Change Analysis of Urban Heat Island Effect in Suzhou

以宿州市为研究对象,Landsat卫星数据作为数据源,利用辐射传输方程法反演宿州市地表温度,对反演结果进行密度分割,系统分析近20年来宿州市地表温度变化及城市热岛效应时空变化。结果表明:地表温度在不断升高,2020年最高、最低和平均温度较2001年分别上升了12.12℃、4.98℃和7.3℃,且温差逐渐增大;城市热岛和绿岛面积变化较大,强热岛区和热岛区面积2020年比2001年分别增加了6.55%和3.71%,强绿岛区和绿岛区面积比分别减少了1.06%和10.67%;强热岛区和热岛区主要分布在市区和县城中心,绿岛区和正常区主要分布在郊区和热岛区边缘地带,强绿岛区主要分布在水域。

Taking Suzhou City as the research object, Landsat satellite data as the data source, by using the radiation transfer equation method to invert the surface temperature of Suzhou City, the inversion results were normalized and classified to systematically analyze the surface temperature changes and the temporal and spatial variation characte-ristics of urban heat island effect in Suzhou city in recent 20 years.The results showed that:(1)The surface temperature was constantly increasing.The maximum, minimum and average temperatures in 2020 have increased by12.12 ℃,4.98 ℃ and 7.3 ℃ respectively compared with 2001,and the temperature difference was gradually increasing;(2)From 2001 to 2020,the area of urban heat island and green island had changed greatly, the area ratio of the strong heat island area and the heat island area increased by 6.55% and 3.71%,respectively, and the area ratio of the strong green island area and the green island area decreased by 1.06% and 10.67% respectively;(3)The area of the strong heat island area and the heat island area were mainly distributed in the urban area and the county center, the green island area and the normal area were mainly distributed in the suburbs and the edge of the heat island area, and the strong green island area was mainly distributed in the water area.