drought monitoring and early warning system in Iran. To overcome this obstacle, we have evaluated the applicability of GPCC … and NCEP/NCAR precipitation datasets for drought analysis in Iran. For this purpose, drought variability across the … and NCEP/NCAR datasets identify the same sub-regions of drought variability and they are in good agreement with …

An analysis of drought in western Iran from 1966 to 2000 is presented using monthly precipitation data observed at 140 … gauges uniformly distributed over the area. Drought conditions have been assessed by means of the Standardized Precipitation … Index (SPI). To study the long-term drought variability the principal component analysis was applied to the SPI field …

The accurate assessment of drought and its monitoring is highly depending on the selection of appropriate indices …. Despite the availability of countless drought indices, due to variability in environmental properties, a single universally … drought index has not been presented yet. In this study, a new approach for developing comprehensive agricultural drought …