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DOI	10.1002/met.1899
	Drought trend, frequency and extremity across a wide range of climates over Iran
	Nouri, Milad 1,2; Homaee, Mehdi 2
通讯作者	Nouri, Milad
来源期刊	METEOROLOGICAL APPLICATIONS
ISSN	1350-4827
EISSN	1469-8080
出版年	2020
卷号	27 期号:2
英文摘要	This study was conducted to assess drought trend, frequency and extremity during 1966-2012 over widely different climatic regimes in Iran. Two drought indicators, i.e. the standardized precipitation index (SPI) and the standardized precipitation evapotranspiration index (SPEI), were employed to characterize the droughts at 3, 6, 12 and 24 month time scales. In addition, the Mann-Kendall test was used for trend analysis. There was a declining (drying) trend in the SPI and SPEI at 76% and 85% or more, respectively, of the investigated sites. The SPIs were not well correlated with the SPEIs over the hyper-arid/arid regions, demonstrating the significance of reference evapotranspiration (ET0) inclusion for drought identification over these water-limited areas. Furthermore, the SPEI appears not to be calculated reliably using temperature-based ET0 equations and also when wind speed data are missing at hyper-arid/arid sites. More frequent droughts were detected during 1998-2012, which can be attributed to more recurrent La Nina events in this period. Seasonally, a greater increment in drought frequency at 3 and 6 month time scales was found in the March-April-May period. The most extended droughts and the most intensive dry months were also captured over 1998-2012 for most locations. In the majority of cases, it seems that the 1998-2001, 2007-2009 and 2010-2012 La Nina events caused long and severe droughts. The drought frequency increment and the most extreme drought incidences seem to have adversely impacted the agricultural sector over the studied areas. Consequently, there is a need for adaptation to negate the influences of frequent intensive dry episodes in Iran.
英文关键词	data limitation ENSO evapotranspiration water-limited environments
类型	Article
语种	英语
国家	Iran
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000530356200015
WOS关键词	PRECIPITATION EVAPOTRANSPIRATION INDEX ; SEMIARID REGIONS ; WET PERIODS ; ENSO ; SENSITIVITY ; RAINFALL ; IMPACTS ; INTENSITY ; ETO ; SPI
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318863
作者单位	1.Iran Chamber Commerce Ind Mines & Agr, Natl Agr & Water Strateg Res Ctr, POB 158364849, Tehran, Iran; 2.Tarbiat Modares Univ, Dept Irrigat & Drainage, POB 1497713111, Tehran, Iran
推荐引用方式 GB/T 7714	Nouri, Milad,Homaee, Mehdi. Drought trend, frequency and extremity across a wide range of climates over Iran[J],2020,27(2).
APA	Nouri, Milad,&Homaee, Mehdi.(2020).Drought trend, frequency and extremity across a wide range of climates over Iran.METEOROLOGICAL APPLICATIONS,27(2).
MLA	Nouri, Milad,et al."Drought trend, frequency and extremity across a wide range of climates over Iran".METEOROLOGICAL APPLICATIONS 27.2(2020).