Investigating Heat Waves in Ardabil City and their Impacts on Urban Heating

Document Type : Research

Authors

Roghayeh Maleki Meresht ¹

Behrouz Sobhani ²

¹ Postdoctoral Researcher in Climatology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

² Professor in Climatology, Faculty of Social Sciences, University of Mohaghegh Ardabili, Ardabil, Iran

https://doi.org/10.22067/jgrd.2023.79213.1203

Abstract

The purpose of this research was investigating the heat waves of Ardabil city and their impacts on urban heating from 2003 to 2018. For this purpose, the maximum temperature data of Ardabil station was obtained from the Meteorological Organization, and then, by applying Fumiaki index to the maximum temperature data in MATLAB software, days with a temperature higher than NTD mean that lasted for at least 2 days were defined as a heat wave day. In order to investigate the impact of heat waves on heat island in the hot and cold months, the heat island for days with heat wave and a normal day without heat wave with the lowest maximum temperature before the occurrence of each heat wave was calculated during the day and at night of Modis-Aqua. The results showed that during the studied period, the highest annual and monthly frequency of heat wave in Ardabil was in 2010 and 2016 in March, April, and July. The results also showed that the maximum duration of heat waves was 4 days, i.e., short-term. In both hot and in cold months, in heat wave and no heat wave conditions, a cold island had been often formed during the day and a heat island is at night in Ardabil downtown. Heat waves, especially in hot months of year, had been more than no heat wave conditions. In heat wave conditions in summer nights, the temperature increase in the thermal island has been up to 4℃. The results showed that the influence of the heat island on the occurrence of heat waves was higher in hot months than cold months.
 
 

Keywords

Ardabil

Heat Waves

Thermal Island

Fumiaki

Subjects

• Risks of the geographical environment

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