Evaluating the Effects of UHI on Mashhad Precipitation

آب و خاک

Article 16, Volume 24, Issue 2, May 2010   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.3252

Authors

M. S. Ghazanfari^{* 1}; A. Alizadeh²; M. Naseri²; A.R. Farid-hosseini²

¹Ferdowsi University of Mashhad

²Dept. of water engineering College of Agriculture Ferdowsi University of Mashhad

Abstract

Abstract
Urban expansion, pollution augmentation, and extention of major industrial activities in metropolitan areas impacted local climates of major cities. Transforming big cities into heat islands is one of the most prominent results of such a micro-climate change. In this study, variation of precipitation, temperature and some other important climatic parameters including relative humidity, and percentage of cloudiness were reviewed in order to study micro-climate change. The city of Mashhad selected for this study, as metropolitan area. The study was performed by comparing the climate parameters of this city with the neighboring regions, which were identified as the same climate category. Due to the effective role of rainfall in the urban weather modification and decreasing of pollution, rainfall variation is more important and crucial. The result of this research showed that the rainfall variation followed the temperature trend. A significant correlation between temperature and precipitation change showed the effect of heat island on urban climate parameters. The urban heat island phenomenon increase the hot season rainfall while its effects on cold season rainfall decrease.

Keywords: Urban Heat Island, Air pollution, Microclimate, Climate change