Gobal Advanced Research Journal of Environmental Science and Toxicology (GARJEST) ISSN: 2315-5140
July 2014 Vol. 3(2), pp. 025-037
Copyright © 2014 Global Advanced Research Journals


Full Length Research Paper

Characteristics and mechanism of extreme climate events under climate change background in Iran - part I: drought

M. Molanejad1, 2, M. Soltani3, 4* and A. Ranjbar Saadat Abadi5

1Scientific Staff of Iranian Research Organization for Science and Technology (IROST)
2Director IORA- Regional Center for Science and Technology Transfer
3Indian Ocean Rim Association (IORA), Regional Center for Science and Technology Transfer (RCSTT), Tehran, Iran
4Department of Physical Geography, Faculty of Geography, University of Tehran, Iran
5Atmospheric Sciences and Meteorological Research Center (ASMERC) of I. R. of Iran Meteorological Organization (IRIMO), Tehran, Iran

*Corresponding author’s email: soltani.clima@gmail.com


Drought is a natural disaster that gives a lot of damage every year. It is one of the most dangerous natural hazards because it is very difficult to identify its onset. In this paper the Standard Precipitation Index (SPI) has been used to monitor drought in Iran. The SPI index is a powerful tool, requiring only rainfall data for its calculation, and delivering major dimensions of drought such as severity, magnitude, frequency etc. Thirty five years (1978 to 2012) of monthly precipitation data of 30 stations across Iran are used to calculate SPI values for a time-scale of 12 month period. The time series plots of SPIs indicated that a negative trend of drought (an increase in drought frequency) over the country except for the central and southeastern parts, where a positive trend and decrease in the frequency of drought observed for those areas. Furthermore, the year 2010 was detected as the driest year in terms of drought severity with values varying between -2.524 and -4.933 that approximately 80% of the stations had a negative trend in which 75% out of 80% was statistically significant during the examined period over Iran. The results also suggested that the drought severity is very critical in the Western areas in particular in Ilam region. As well as, we found that the mountainous regions, in general, are more vulnerable to drought phenomenon rather than other parts of the country. The synoptic features at 500 hPa and surface levels of the extremely dry (the severest drought) year i.e. 2010 proved that no suitable rising condition was provided during the mentioned year, because of the formation of a belt of high pressures over Iran as well as the expansion of the Siberian high pressure center southwestward. Consequently, no considerable amount of moisture transferred to the country, and as a result, the lowest amounts of the annual precipitation were recorded at the thirty selected stations during the examined period across Iran.

Keywords: Drought, standardized precipitation index, frequency, severity, synoptic pattern, Iran


Related Articles

Mohammad Khosravi Shakib
Iran’s inheritance and contribution to the civilization and culture of manhood over 2500 years
Glo. Adv. Res. J. Environ. Sci. Toxicol. April 2012 Vol: 1(3): - [Abstract] [Full Text - PDF] (155 KB)
Original Research Articles
Abhimanyu Kumar and Pragya Baseria
The Study of Social Mobility Among Scheduled Castes of Blocks Modhinagar in Ghaziabad District of Uttar Pradesh, India
Glo. Adv. Res. J. Environ. Sci. Toxicol. April 2012 Vol: 1(3): - [Abstract] [Full Text - PDF] (161 KB)
Samar Abdalla, Eltighani Elamin and Abdelmoneim Taha
Assessment of Food and Nutrition Security/Insecurity in Sudan Using Frequency and Severity of the Coping Strategies
Glo. Adv. Res. J. Environ. Sci. Toxicol. November 2017 Vol: 6(11): - [Abstract] [Full Text - PDF] (278 KB)
Adeoti Johnson Olabode and Omolabi Issa
Enhancing Quality Education Through Total Quality Management Approach The Students Assessment Methods
Glo. Adv. Res. J. Environ. Sci. Toxicol. April 2013 Vol: 2(4): - [Abstract] [Full Text - PDF] (100 KB)
Sara Afsharinia, Ayad I Ismail, Sara Seyed Naseri and Jalaleddin Hamissi
Survey of self-reported Stress among Iranian and UAE general and specialist dentists
Glo. Adv. Res. J. Environ. Sci. Toxicol. May 2015 Vol: 4(5): - [Abstract] [Full Text - PDF] (276 KB)
Enwuso A. Igwe
Influence of Candle Wax on Stiffness Property E of Hot Mix Asphalt HMA Concrete Light Traffic Case Study
Glo. Adv. Res. J. Environ. Sci. Toxicol. September 2015 Vol: 4(5): - [Abstract] [Full Text - PDF] (1,122 KB)

Current Issue

Viewing Options

View Full Article - PDF
Download Full Article - PDF

Search for Articles

Molanejad M on Google Scholar
Molanejad M on Pubmed
Soltani M on Google Scholar
Soltani M on Pubmed
Ranjbar Saadat Abadi A on Google Scholar
Ranjbar Saadat Abadi A on Pubmed


Viewed 1169
Printed 270
Downloaded 644
Powered By iPortal Works