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Detection of climate change with extreme precipitation indices in great Khorasan


 Start Page 34 | End Page 52


Climate Change with change in climate pattern and disrupt the order of ecosystems, causes serious consequences on the environment. Changes in weather patterns can led to the severe flooding, extreme heat and cold, more frequent droughts, sea level rise, global warming and Permanent ice melting. In this reaearch, for detecting the Climate Change in Great Khorasan, were use 25 year data(14 stations) statistics from1/1/1987 to 31/12/2011. the results showed that few stations such as Ghochan (10 indices), Bojnourd (7 indices), Golmakan (5 indices), Sabzevar (3 indices) have an increase in the number of extreme precipitation indices. Ferdows, Torbat heidarieh, Ghaen and Nehbandan stations 100% and Birjand, Tabas, Gonabad, Mashhad and Kashmar stations over than 90% from rainfall changes. Among the indices, consecutive wet days index(CWD) with 92. 9%, total annual precipitation wet days index (PRCPTOT) with 85. 7%, Show the largest percentage decline. So in the north-west on Iran, except of Ghochan and to some extent Bojnourd, other station have experienced drastic changes in precipitation In the last 25 years. Also according to descending and ascending trend of indicators and stations features (topography, height, distance from damp sources and … . ) we can result that in Climate Change latitude is more obvious than longitude. Because stations in upper latitude (Bojnord, Ghochan, Golmakan) in some Extreme Precipitation Indicators show ascending trend; while large height of stations in lower latitude (Ferdows, Ghaen, Torbat heidarie, Birjand, Kashmar, Gonabad) has failes to show the ascending trends of Extreme Precipitation Indicators.


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