Document Type: Research Paper
Associate Professor of Climatology, Meybod University, Meybod, Iran.
PHD graduate of Climatology, Yazd University, Yazd, Iran.
PHD graduate of Climatology, University of Isfahan, Isfahan, Iran
This study aims to evaluate Spatio-temporal distribution of rainfall through cluster analysis based on Tropical Rainfall Measuring Mission (TRMM) in Iran. To this purpose, the daily-gridded rainfall data were derived for the 1998-2013 period. Then, the seasonal and annual time scale cluster analysis was performed on TRMM-derived rainfall data. The results identified 14 clusters in the annual rainfall. As a high- rainfall zone, Guilan has an average rainfall of 1068 mm per year while Sistan, as a low-rainfall area, has an average rainfall of 106.8 mm annually. Furthermore, the seasonal rainfall distribution indicates high-rainfall zones in Guilan and Mazandaran provinces in spring, summer, and autumn while the areas in the southern range of Alborz Mountain and Persian Gulf are clustered as low-rainfall zone. The rainfall distribution in Iran is seasonal, and the following provinces are among the high-rainfall zones in winter: Kohgiluyeh and Boyer Ahmad, Chaharmahal and Bakhtiari, Khuzestan, and highlands of Lorestan. The low-rainfall areas also include Sistan and Baluchistan, Yazd, and Semnan.