Trends in meteorological and agricultural droughts in Iran

The aim of this paper is to investigate characteristics of meteorological and agricultural droughts and their trends in Iran, as well as several subregions with different climate conditions from 1980 to 2013. The Standardized Precipitation Index (SPI) and Standardized Soil Moisture Index (SSI) are u...

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Bibliographic Details
Published in:Theoretical and applied climatology 2015-02, Vol.119 (3-4), p.679-688
Main Authors: Golian, S., Mazdiyasni, O., AghaKouchak, A.
Format: Article
Language:English
Subjects:
Agricultural drought
Analysis
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Climate change
Climatic conditions
Climatology
Drought
Drought index
Droughts
Drying
Earth and Environmental Science
Earth Sciences
El Nino
La Nina
Marine
Meteorology
Moisture index
Original Paper
Precipitation (Meteorology)
Sea surface temperature
Soil moisture
Southern Oscillation
Standardized precipitation index
Waste Water Technology
Water Management
Water Pollution Control
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Summary:The aim of this paper is to investigate characteristics of meteorological and agricultural droughts and their trends in Iran, as well as several subregions with different climate conditions from 1980 to 2013. The Standardized Precipitation Index (SPI) and Standardized Soil Moisture Index (SSI) are used as the primary indicators of meteorological and agricultural droughts, respectively. This study assesses historical droughts using the Multivariate Standardized Drought Index (MSDI), which provides a composite model of meteorological–agricultural drought. Furthermore, this study discusses the behavior of MSDI relative to the other indices (SPI and SSI) over different climatic conditions ranging from humid, semiarid, and hyperarid regions. The Mann–Kendall trend test shows that the northern, northwestern, and central parts of Iran have experienced significant drying trends at a 95 % confidence level. However, no statistically significant drying trend was observed in the eastern part of Iran. The most severe drought across the country occurred between 1998 and 2001, with approximately 80 % of the country experiencing an exceptional drought (
ISSN:0177-798X
1434-4483
DOI:10.1007/s00704-014-1139-6