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:: Volume 27, Issue 2 (2012) ::
geores 2012, 27(2): 37-56 Back to browse issues page
Spatial and temporal analysis of Iran extreme cold days' trend
Seyed Abolfazl Masoodian *1, Mohammad Darand2
1- Esfahan University , s.a.masoudian@geo.ui.ac.ir
2- Kurdistan University
Abstract:   (628 Views)
In order to have spatial and temporal analysis of Iran extreme cold days'' trend، the average of daily temperature data from 663 synoptic and climatologic stations of Iran during the period of 1961/21/03 to 2004/19/03 were used. Then، temperature data on 15*15 kilometer pixels were interpolated using Kriging method for Iran. The extreme cold days were identified by Normalized Temperature Difference (NTD) index. According to the index، the days with NTD -2 were selected as extreme cold days. Then، a trend analysis was applied to the extreme cold days for each month of year. The results showed the negative trend extend of the extreme cold days is further than the positive trend extend. Positive trend located on the high mountains in Shahre Kord، Sannadaj، Zanjan to Ardabil and a thin band on Alborz mountains range. While a negative trend located on central-south of Iran. In January and July extreme cold occurrence is more frequent and least respectively.
Keywords: Spatial and temporal analysis, Extreme cold events, Iran
Full-Text [PDF 751 kb]   (101 Downloads)    
Article Type: Original Research | Subject: Climatology
Received: 2018/09/12 | Accepted: 2018/09/12 | Published: 2018/09/12
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Masoodian S A, Darand M. Spatial and temporal analysis of Iran extreme cold days' trend . geores. 2012; 27 (2) :37-56
URL: http://georesearch.ir/article-1-604-en.html


Volume 27, Issue 2 (2012) Back to browse issues page
فصلنامه تحقیقات جغرافیایی Geographical Researches Quarterly Journal
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