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DOI	10.5194/hess-25-565-2021
	Flash drought onset over the contiguous United States: sensitivity of inventories and trends to quantitative definitions
	Osman, Mahmoud; Zaitchik, Benjamin F.; Badr, Hamada S.; Christian, Jordan, I; Tadesse, Tsegaye; Otkin, Jason A.; Anderson, Martha C.
通讯作者	Osman, M (corresponding author), Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA.
来源期刊	HYDROLOGY AND EARTH SYSTEM SCIENCES
ISSN	1027-5606
EISSN	1607-7938
出版年	2021
卷号	25 期号:2 页码:565-581
英文摘要	The term flash drought is frequently invoked to describe droughts that develop rapidly over a relatively short timescale. Despite extensive and growing research on flash drought processes, predictability, and trends, there is still no standard quantitative definition that encompasses all flash drought characteristics and pathways. Instead, diverse definitions have been proposed, supporting wide-ranging studies of flash drought but creating the potential for confusion as to what the term means and how to characterize it. Use of different definitions might also lead to different conclusions regarding flash drought frequency, predictability, and trends under climate change. In this study, we compared five previously published definitions, a newly proposed definition, and an operational satellite-based drought monitoring product to clarify conceptual differences and to investigate the sensitivity of flash drought inventories and trends to the choice of definition. Our analyses indicate that the newly introduced Soil Moisture Volatility Index definition effectively captures flash drought onset in both humid and semi-arid regions. Analyses also showed that estimates of flash drought frequency, spatial distribution, and seasonality vary across the contiguous United States depending upon which definition is used. Definitions differ in their representation of some of the largest and most widely studied flash droughts of recent years. Trend analysis indicates that definitions that include air temperature show significant increases in flash droughts over the past 40 years, but few trends are evident for definitions based on other surface conditions or fluxes. These results indicate that flash drought is a composite term that includes several types of events and that clarity in definition is critical when monitoring, forecasting, or projecting the drought phenomenon.
类型	Article
语种	英语
开放获取类型	gold, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000618624200001
WOS关键词	SUMMER HEAT-WAVE ; SOIL-MOISTURE ; PRECIPITATION DEFICIT ; US DROUGHT ; MORTALITY
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350513
作者单位	[Osman, Mahmoud; Zaitchik, Benjamin F.; Badr, Hamada S.] Johns Hopkins Univ, Dept Earth & Planetary Sci, Baltimore, MD 21218 USA; [Christian, Jordan, I] Univ Oklahoma, Sch Meteorol, Norman, OK 73019 USA; [Tadesse, Tsegaye] Univ Nebraska, Natl Drought Mitigat Ctr, Lincoln, NE USA; [Otkin, Jason A.] Univ Wisconsin, Cooperat Inst Meteorol Satellite Studies, Space Sci & Engn Ctr, Madison, WI USA; [Anderson, Martha C.] ARS, Hydrol & Remote Sensing Lab, USDA, Beltsville, MD USA
推荐引用方式 GB/T 7714	Osman, Mahmoud,Zaitchik, Benjamin F.,Badr, Hamada S.,et al. Flash drought onset over the contiguous United States: sensitivity of inventories and trends to quantitative definitions[J],2021,25(2):565-581.
APA	Osman, Mahmoud.,Zaitchik, Benjamin F..,Badr, Hamada S..,Christian, Jordan, I.,Tadesse, Tsegaye.,...&Anderson, Martha C..(2021).Flash drought onset over the contiguous United States: sensitivity of inventories and trends to quantitative definitions.HYDROLOGY AND EARTH SYSTEM SCIENCES,25(2),565-581.
MLA	Osman, Mahmoud,et al."Flash drought onset over the contiguous United States: sensitivity of inventories and trends to quantitative definitions".HYDROLOGY AND EARTH SYSTEM SCIENCES 25.2(2021):565-581.