The role of heat island in temperature change process of Tehran metropolitan area1

Subject Areas : geo

Sahar  Mansouri ¹ (Department of Geography, Faculty of Human Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran.)
shahriar  khaledi ² (Department of Physical Geography, Faculty of Earth Sciences, Shahid beheshti University, Tehran, Iran.)
Reza  Borna ³ (Department of Geography, Faculty of Human Sciences, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran.)
Farideh  Asadian ⁴ (Department of Geography, Faculty of Human Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran.)

Received: 2020-10-03 Accepted : 2021-05-12 Published : 2021-08-23

Keywords: heat island, Tehran Region 1, Vegetation, Temperature Changes,

Abstract :

This study aims to investigate the role of heat island in the process of temperature changes in an urban area of Tehran during 2010 and 2018, equivalent to 1389 and 1397. To evaluate the changes, five points were identified on the map of region 1 and its eight regions. Then the middle month of each season from 2010 and 2018 was selected for review. Landsat 8 satellite data were used to analyze the heat island and the effects of urban construction on the intensification of this phenomenon. The maximum temperature data, normalized vegetation difference index, and ground surface temperature were extracted. This study shows that the level of vegetation in 2018 compared to 2010 has decreased sharply, so that it has caused temperature changes and also the creation of a heat island in recent years in the region. The increase in temperature in the morning and noon is observed in all selected months of the four seasons of the year. At the same time, the amount of increase in minimum temperatures was greater than the maximum temperatures.