Journal of Range and Watershed Managment

An Investigation on Trends of Annual and Seasonal Rainfall and Temperature in Different Climatologically Regions of Iran

Document Type : Research Paper

Authors

Maryam Azarakhshi 1
Jalil Farzadmehr 2
Mahdi Eslah 3
Hossein Sahabi 4

1 Assistant professor, Torbat e Heydariye High Education Complex

2 Assistant professor, University of Birjand, Agriculture Collage

3 M.Sc. Student of Watershed Management, University of Mazandaran

4 Teaching assistant, Torbat e Heydariye High Education Complex

https://doi.org/10.22059/jrwm.2013.35324
Abstract
Climate change is defined as long term and irreversible changes in the climatic behavior
of a region. Many studies have been conducted in different regions of the world on climate
change. The results of these studies show considerable changes in climatic factors especially
in precipitation and temperature. In this research, the trend of changes in annual and seasonal
rainfall and temperature in 24 synoptic stations over a 50-year data period (1956-2005) was
investigated in Iran. The Mann- Kendall test and linear regression technique were used to analyze
the trend of changes in climatic factors. The results showed both increasing and decreasing
trends in annual rainfall at various regions of Iran. Annual rainfall in northern slopes of Alborz
and western slopes of the Zagros Mountain as well as in eastern and southeast parts of Iran had
a decreasing trend while in the central of Iran the trend of changes was increasing. In southern
region of Iran the rainfall had an increasing trend. The results also showed that temperature in
most of the studied stations over the considered period was increasing. The highest and lowest
changes in temperature were seen in the mean temperature of summer and winter, respectively.
Ahwaz and Khorramabad stations had a decreasing trend and over all seasons would go toward
more cooling. The temperature trend in Oromiye was decreasing in autumn and summer while
Shahrekord and Bandar abbas had the same trend in summer and winter.

Keywords

climate change
Iran
linear regression
Mann-Kendall Test
trend

  • Receive Date 05 July 2010
  • Revise Date 30 September 2013
  • Accept Date 04 July 2012
  • Publish Date 21 March 2013

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