The cities that are built on the arid biomes with the hot and dry climates can adjust the temperature (oasis effect) and create the urban cool island (UCI) during the day. As the background climate of the Isfahan metropolis is warm and dry, we can expect an UCI during the day. The MODIS land cover product data were used to distinguish between the urban and nonurban areas. The MODIS/Terra/LST data from 2000 to 2016 were then used for day-time view to examine the UCI. In the next step, the UCI intensity index was calculated by the spatial correlation representative pixel method for the city and the background. This study showed that due to the passage of the Zayandehrood river from the middle of the city and the expansion of vegetation in the urban environment, the metropolitan area of Isfahan is 3.5° cooler than the suburban barren lands during the day. The UCI intensity index has been intensified over the last few years and has fallen below − 4.5°. The studies have shown that the UCI intensity index is weakened during the cold months and intensified in the warm months of the year. The seasonal changes in UCI intensity in the metropolitan area of Isfahan can be related to the high variability of vegetation throughout the year.

建立在具有干旱和干燥气候的干旱生物群落之上的城市，可以调节温度（绿洲效应）并在白天创建城市凉爽的岛屿（UCI）。由于伊斯法罕（Isfahan）大都会的背景气候温暖干燥，因此我们预计白天会有UCI。MODIS土地覆盖产品数据用于区分市区和非市区。然后将2000年至2016年的MODIS / Terra / LST数据用于日间视图，以检查UCI。下一步，通过空间相关代表像素法计算城市和背景的UCI强度指数。这项研究表明，由于Zayandehrood河从城市中心经过，加上城市环境中植被的扩张，伊斯法罕的都会区为3。白天比郊区的荒地凉爽5°。在过去的几年中，UCI强度指数有所增强，并已降至− 4.5°以下。研究表明，UCI强度指数在寒冷的月份减弱，而在一年的温暖月份则增强。伊斯法罕大都市地区UCI强度的季节性变化可能与全年植被的高变异性有关。