Investigation of snow cover changes affected by climate change In North West of Iran
In this study in order to monitor snow cover, the Moderate Resolution Imaging Spectroradiometer (MODIS) optical images were used, while for detection of snow covered areas, the snow index-NDSI, was applied. The results showed - according to the climatic conditions of the region- during the followin...
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Kharazmi University
2019-09-01
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| Series: | تحقیقات کاربردی علوم جغرافیایی |
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| Online Access: | http://jgs.khu.ac.ir/article-1-2828-en.pdf |
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| author | Ebrahim Fattahi shookat moghimi |
| author_facet | Ebrahim Fattahi shookat moghimi |
| author_sort | Ebrahim Fattahi |
| collection | DOAJ |
| description | In this study in order to monitor snow cover, the Moderate Resolution Imaging Spectroradiometer (MODIS) optical images were used, while for detection of snow covered areas, the snow index-NDSI, was applied. The results showed - according to the climatic conditions of the region- during the following months: December, January, February and March, most of the area is covered by snow and the maximum extent of snow cover occurred in January. In West Azerbaijan province there is found a negative trend of snow cover with a drastically reduction in January, as well as the provinces East Azerbaijan and Ardebil showed the decreasing of snow cover in this month. The results of this study show that, changes in snow cover imply a rise in temperature in this region leading to the reduction of snow cover in January. This trend represents global warming and climate change impacts on snow cover in the study area. Investigation of extreme indices confirms the assumption that by taking temperature increase into consideration, regional winter precipitation pattern has been changed from snow to rain, causing the reduction of snow storage in the catchment of study area. In addition ,the extreme temperature index study in the period of 2011- 2040 and the baseline by considering climate change approach in North West of Iran by using outputs of general circulation models under A2 scenario and downscaling models LARS-WG indicates the number of frost days or the number of icy days decreased compared to the baseline which is not unexpected according to reports by the Intergovernmental Panel on Climate Change (IPCC) as well as several studies confirmed global warming. Moreover, indices such as growth period increased, while diurnal temperature variation decreased compared to the baseline confirming snow cover reduction in the region as a threat of snow storage in the region. |
| format | Article |
| id | doaj-art-7d60a27013d44570a70f929581ea47a6 |
| institution | Kabale University |
| issn | 2228-7736 2588-5138 |
| language | fas |
| publishDate | 2019-09-01 |
| publisher | Kharazmi University |
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| series | تحقیقات کاربردی علوم جغرافیایی |
| spelling | doaj-art-7d60a27013d44570a70f929581ea47a62025-01-31T17:25:38ZfasKharazmi Universityتحقیقات کاربردی علوم جغرافیایی2228-77362588-51382019-09-0119544763Investigation of snow cover changes affected by climate change In North West of IranEbrahim Fattahi0shookat moghimi1 Associate Professor of Weather Institute, Tehran, Iran Associate professor of climatology, Payam Noor University, Tehran, Iran. In this study in order to monitor snow cover, the Moderate Resolution Imaging Spectroradiometer (MODIS) optical images were used, while for detection of snow covered areas, the snow index-NDSI, was applied. The results showed - according to the climatic conditions of the region- during the following months: December, January, February and March, most of the area is covered by snow and the maximum extent of snow cover occurred in January. In West Azerbaijan province there is found a negative trend of snow cover with a drastically reduction in January, as well as the provinces East Azerbaijan and Ardebil showed the decreasing of snow cover in this month. The results of this study show that, changes in snow cover imply a rise in temperature in this region leading to the reduction of snow cover in January. This trend represents global warming and climate change impacts on snow cover in the study area. Investigation of extreme indices confirms the assumption that by taking temperature increase into consideration, regional winter precipitation pattern has been changed from snow to rain, causing the reduction of snow storage in the catchment of study area. In addition ,the extreme temperature index study in the period of 2011- 2040 and the baseline by considering climate change approach in North West of Iran by using outputs of general circulation models under A2 scenario and downscaling models LARS-WG indicates the number of frost days or the number of icy days decreased compared to the baseline which is not unexpected according to reports by the Intergovernmental Panel on Climate Change (IPCC) as well as several studies confirmed global warming. Moreover, indices such as growth period increased, while diurnal temperature variation decreased compared to the baseline confirming snow cover reduction in the region as a threat of snow storage in the region.http://jgs.khu.ac.ir/article-1-2828-en.pdfsnow coverclimate changeprocesstemperatureextreme index |
| spellingShingle | Ebrahim Fattahi shookat moghimi Investigation of snow cover changes affected by climate change In North West of Iran تحقیقات کاربردی علوم جغرافیایی snow cover climate change process temperature extreme index |
| title | Investigation of snow cover changes affected by climate change In North West of Iran |
| title_full | Investigation of snow cover changes affected by climate change In North West of Iran |
| title_fullStr | Investigation of snow cover changes affected by climate change In North West of Iran |
| title_full_unstemmed | Investigation of snow cover changes affected by climate change In North West of Iran |
| title_short | Investigation of snow cover changes affected by climate change In North West of Iran |
| title_sort | investigation of snow cover changes affected by climate change in north west of iran |
| topic | snow cover climate change process temperature extreme index |
| url | http://jgs.khu.ac.ir/article-1-2828-en.pdf |
| work_keys_str_mv | AT ebrahimfattahi investigationofsnowcoverchangesaffectedbyclimatechangeinnorthwestofiran AT shookatmoghimi investigationofsnowcoverchangesaffectedbyclimatechangeinnorthwestofiran |