Investigating the effect of heat waves On Thermal Islands In Tabriz metropolis

جغرافیا و مخاطرات محیطی

Article 7, Volume 10, Issue 2 - Serial Number 38, July 2021, Pages 111-128   

Document Type: Research Article

DOI: 10.22067/geoeh.2021.69683.1040

Authors

Roghayeh Maleki Meresht¹; Behrouz Sobhani^{* 2}; Masoud Moradi³

¹Ph.D. Student of Natural Geography, Climatology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

²Professor, Department of Natural Geography, Climatology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

³Ph.D. of Climatology, Faculty of Natural Resources, University of Kurdistan, Sanandaj, Iran.

Abstract

Heat waves are one of the most important climatic disasters. The purpose of this study was investigation the effect of heat waves on the heat islands of Tabriz metropolis from 2003 to 2018. For this purpose, maximum temperature data of Tabriz Synoptic Station were obtained from the Meteorological Organization and days with heat waves were determined with the help of the normalized temperature Fumiaki index and through programming in MATLAB software. To investigate the effect of heat waves on the intensification of thermal islands, heat waves in the hot and cold months of the year are selected and thermal islands for those days and a day without heat waves with the minimum temperature before each heat wave during the day and night with the help the Land surface temperature data of the Modis- Aqua sensor were calculated. According to the results, during the study period, the maximum duration of heat waves was 4 days and therefore short-term. The highest annual and monthly frequency of heat waves were in 2010 and in April, June and December, respectively, and the trend of heat waves in the study period had a slight non-significant decrease. According to the results, in both hot and cold months, often in both heat waves and no heat wave conditions, a cold island on day and a hat island at night, is formed in the city center, which occurs with the occurrence of heat waves. Compared to normal days, the intensity of the daily cold island and the night heat island has increased, which was more noticeable in the warm months than in the cold months. Also, according to the findings, the persistence of heat waves has not played a significant role in intensifying the thermal islands.

Keywords

Fumiaki index; heat waves; thermal islands; Tabriz metropolis

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