Mitigating the Urban Heat Island Effect in Megacity Tehran

Sahar Sodoudi, Parisa Shahmohamadi, Ken Vollack, Ulrich Cubasch, Adi Irfan Che Ani

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Cities demonstrate higher nocturnal temperatures than surrounding rural areas, which is called "urban heat island" (UHI) effect. Climate change projections also indicate increase in the frequency and intensity of heat waves, which will intensify the UHI effect. As megacity Tehran is affected by severe heatwaves in summer, this study investigates its UHI characteristics and suggests some feasible mitigation strategies in order to reduce the air temperature and save energy. Temperature monitoring in Tehran shows clear evidence of the occurrence of the UHI effect, with a peak in July, where the urban area is circa 6 K warmer than the surrounding areas. The mobile measurements show a park cool island of 6-7 K in 2 central parks, which is also confirmed by satellite images. The effectiveness of three UHI mitigation strategies high albedo material (HAM), greenery on the surface and on the roofs (VEG), and a combination of them (HYBRID) has been studied using simulation with the microscale model ENVI-met. All three strategies show higher cooling effect in the daytime. The average nocturnal cooling effect of VEG and HYBRID (0.92, 1.10 K) is much higher than HAM (0.16 K), although high-density trees show a negative effect on nocturnal cooling.

Original languageEnglish
Article number547974
JournalAdvances in Meteorology
Volume2014
DOIs
Publication statusPublished - 2015

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heat islands
megacity
heat island
Thermal effects
Cooling
albedo
cooling
Climate change
Roofs
Temperature
mitigation
Satellites
rural areas
Monitoring
roofs
climate change
daytime
Air
microbalances
summer

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Pollution

Cite this

Mitigating the Urban Heat Island Effect in Megacity Tehran. / Sodoudi, Sahar; Shahmohamadi, Parisa; Vollack, Ken; Cubasch, Ulrich; Che Ani, Adi Irfan.

In: Advances in Meteorology, Vol. 2014, 547974, 2015.

Research output: Contribution to journalArticle

Sodoudi, Sahar ; Shahmohamadi, Parisa ; Vollack, Ken ; Cubasch, Ulrich ; Che Ani, Adi Irfan. / Mitigating the Urban Heat Island Effect in Megacity Tehran. In: Advances in Meteorology. 2015 ; Vol. 2014.
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