Mitigating the Urban Heat Island Effect in Megacity Tehran
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 seve...
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| Format: | Article |
| Language: | English |
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Wiley
2014-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2014/547974 |
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| author | Sahar Sodoudi Parisa Shahmohamadi Ken Vollack Ulrich Cubasch A. I. Che-Ani |
| author_facet | Sahar Sodoudi Parisa Shahmohamadi Ken Vollack Ulrich Cubasch A. I. Che-Ani |
| author_sort | Sahar Sodoudi |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-50cb085ea65548b4b4d17eefc2c99b94 |
| institution | Kabale University |
| issn | 1687-9309 1687-9317 |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Meteorology |
| spelling | doaj-art-50cb085ea65548b4b4d17eefc2c99b942025-02-03T01:03:24ZengWileyAdvances in Meteorology1687-93091687-93172014-01-01201410.1155/2014/547974547974Mitigating the Urban Heat Island Effect in Megacity TehranSahar Sodoudi0Parisa Shahmohamadi1Ken Vollack2Ulrich Cubasch3A. I. Che-Ani4Institut für Meteorologie, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10, 12165 Berlin, GermanyResilient Urban Planning + Development (RUPD) GbR, Eichendorffstr. 1, 10115 Berlin, GermanyInstitut für Meteorologie, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10, 12165 Berlin, GermanyInstitut für Meteorologie, Freie Universität Berlin, Carl-Heinrich-Becker-Weg 6-10, 12165 Berlin, GermanyDepartment of Architecture, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia (UKM), 43600 Bangi, Selangor, MalaysiaCities 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.http://dx.doi.org/10.1155/2014/547974 |
| spellingShingle | Sahar Sodoudi Parisa Shahmohamadi Ken Vollack Ulrich Cubasch A. I. Che-Ani Mitigating the Urban Heat Island Effect in Megacity Tehran Advances in Meteorology |
| title | Mitigating the Urban Heat Island Effect in Megacity Tehran |
| title_full | Mitigating the Urban Heat Island Effect in Megacity Tehran |
| title_fullStr | Mitigating the Urban Heat Island Effect in Megacity Tehran |
| title_full_unstemmed | Mitigating the Urban Heat Island Effect in Megacity Tehran |
| title_short | Mitigating the Urban Heat Island Effect in Megacity Tehran |
| title_sort | mitigating the urban heat island effect in megacity tehran |
| url | http://dx.doi.org/10.1155/2014/547974 |
| work_keys_str_mv | AT saharsodoudi mitigatingtheurbanheatislandeffectinmegacitytehran AT parisashahmohamadi mitigatingtheurbanheatislandeffectinmegacitytehran AT kenvollack mitigatingtheurbanheatislandeffectinmegacitytehran AT ulrichcubasch mitigatingtheurbanheatislandeffectinmegacitytehran AT aicheani mitigatingtheurbanheatislandeffectinmegacitytehran |