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Hossein Asakereh

حسين عساكره ، مهدي دوستكاميان
تغییرات زمانی و مکانی آب قابل بارش در جو ایران زمین
Tempo-Spatial Changes of Perceptible Water in the Atmosphere of Iran
Abstract


Abstract The perceptible water is the mass of water vapor (in grams) in a vertical column one square centimeter in cross-section that extends from Earth's surface to the upper reaches of the atmosphere. In order to estimate trends and long term changes of perceptible water over Iran, the NCEP/NCAR data during 1961- 2011 have been used. This database is available for 00:00, 06:00, 12:00 and 18:00 o’clock and by a resolution of 2.5 longitudes  2.5 latitude. The Grads and Matlab Software has been used for the calculation purposes. Also Surfer software is used to illustrate and drew the maps. The result of this research has shown that perceptible water over Iran is dramatically vary in space, especially over mountain ace area i.e. Zagros Mountain chain. The lowest spatial variation has occurred in the central region of Iran and over the Caspian Sea and the Persian Gulf coasts. The long term trends showed that for all times of the day the perceptible water has experience decreasing trends over 70 percent of the country extent with significance level of 95%. In southeast of the country, this decreasing trend also exists but is non significant in 95% confidence level. Keywords: Iran, Perceptible water, Man-Kendal Test, Spatial variation, Trend

 

 

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