RT - Journal Article T1 - Temporal Distribution and Regime of Precipitation of Northwest of Iran JF - Geographical-Researches YR - 2014 JO - Geographical-Researches VO - 29 IS - 1 UR - http://georesearch.ir/article-1-421-en.html SP - 145 EP - 160 K1 - Precipitation Regime K1 - North K1 - West of Iran K1 - Seasonal Index K1 - Homogeneity Index K1 - Coefficient of Variation AB - Precipitation regime refers to distribution of seasonal- monthly precipitation. By studying this character، it could be find out about the most important parts of mechanism(s) dominant in temporal distribution of precipitation. Precipitation regime can have positive or negative effects on other environmental components performance. In the present research، the monthly data in 73 stations during 1966-2005 have been analyzed to describe precipitation regime in North West of Iran. In order to do the study، three precipitation indices (coefficient of variation، homogeneity Index and seasonal index were used. Indices have shown same characters of precipitation regime. Results show that minimum value of precipitation coefficient of variation and maximum homogeneity occurring in north-east region. This part have homogeneity precipitation regime with a humidity season that showing different precipitation systems are activate. South-east region have a completely temporal-concentration precipitation regime. It refers to more effect of concentrate systems special in a season. There are in 80% of region with seasonal precipitation regime have a short dry season. LA eng UL http://georesearch.ir/article-1-421-en.html M3 ER -