The Effect of Heat Island Phenomenon on the Local Climate Change in Ahwaz Metropolis

Vertical and horizontal extension of cities and growing trend of industrial activities in them has<br />resulted in wide changes on ground physical properties, released energy, air pollution, temperature<br />and as a result change of local climate in metropolises. Cities are often warmer than their<br />environment. This phenomenon is determined by the difference between cities’ energy and their<br />environment’s energy. Synoptic climatology data of Ahvaz and Dezfool in a 44- year period was<br />surveyed and studied to specify these changes in Ahvaz metropolis. The results showed that annual<br />average minimum temperature of Ahwaz in this period has a total increasing trend of 3.375 °C and<br />(0.077 °C/1yr) yearly, whereas the corresponding parameter was without any changes in Dezfool.<br />Temperature increasing trend in Ahwaz in comparison with Dezfool as indicated by the results which<br />is resulted by the heat island effect in Ahwaz and the lack of development of Dezfool with time. The<br />greatest increase rate of Ahwaz average minimum temperature is 4.14 °C and (0.094 °C/1yr) yearly in<br />Azar monthly in this period and the smallest is 2.07 °C and (0/047 °C/1yr) yearly in Esfand monthly.<br />Usually the extent and extension of the city are known as the most important factors in the severity of<br />heat island effect, and population growth is among the serious factors which cause the increase of its<br />severity and finally result in the change of local climate of metropolis. Population is considered as<br />parameter which is explanatory of city’s size. In this study, a relationship has been developed for the<br />average intensity of heat island effect in Ahwaz and the logarithm of population.

Abstract licence: CC BY

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