Abstract
: Detection of urbanization effect to understand climate change is important. Urbanization effect on air temperature in Zayanderud river basin was evaluated using weather stations network. Map of the temperature trend was generated using full dataset and rural stations to visualize warming trends. A comparative analysis was carried out to estimate urban heat island effect. The result indicated that overall warming trend in the basin is 0.012°C year-1 and the contribution of urban warming to total temperature change was estimated to be 17%. Variation of urban warming throughout the basin was 0-0.016°C year-1. The centre of a basin with a large UHI effect by 0.006-0.016°C year-1 is more influenced by urbanization. Records of hemispheric mean temperatures from ground areas for the past 100 years prepare pivotal input to the argument over global warming. Contrary to precise apply of the basic station data in some of these collections of hemispheric temperature, there have been proposals that a ration of the 0.5°C warming seen on a century timescale may be related to urbanization affections-local warming caused by the effects of urban enlargement. The consequences display that the urbanization affection in two of the most widely used hemispheric data sets is, at most, an order of quantity less than the warming seen on a century timescale. The climatic alternations of the temperature are considered. Gridded temperature data are necessary to run ecological models at regional scales for climate impact studies and have been generated by spatially incorporating preceded values at synoptic stations.
Highlights
Urbanization is a human activity that modifies the nature of the surface and atmospheric properties of a region
In addition to urbanization effect, the reason for regional differences in the magnitude of warming over the basin may refer to physical geographic, vegetation, land cover, land use, atmospheric circulation etc
This study aimed to evaluate urbanization effect on mean annual air temperatures in Iran’s Zayanderud river basin using analysis of regional trends
Summary
Urbanization is a human activity that modifies the nature of the surface and atmospheric properties of a region. This phenomenon affects the surface energy budget, land–atmosphere interaction, hydrologic regimes, resulting in urban climate feature so-called Urban Heat Island (UHI) effect (Collier, 2006; Habete and Ferreira, 2016). Many studies were conducted on comparing rural and urban warming and most of them pointed out a warmer climate in urban areas due to UHI effect (Yan et al, 2010; Ren and Zhou, 2014). Karl et al (1988) studied the variation of temperature during 1901-1984 in urban and rural areas of United States and found that even small cities experienced the evident influence of urbanization on the temperature trend. Many studies were conducted on comparing rural and urban warming and most of them pointed out a warmer climate in urban areas due to UHI effect (Yan et al, 2010; Ren and Zhou, 2014). Jones et al (2008) showed that temperatures in a suburb of London and Vienna increased relative to rural locations nearby in recent decades. Karl et al (1988) studied the variation of temperature during 1901-1984 in urban and rural areas of United States and found that even small cities experienced the evident influence of urbanization on the temperature trend. Peterson et al (1999) divided the 7280 stations of the world into rural, suburban and urban stations and, by analyzing the global mean temperature trend based on all of stations and the rural stations, they observed that the
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