气候变化领域集成服务门户(CCPortal): Global Flash Droughts Characteristics: Onset, Duration, and Extent at Watershed Scales

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DOI	10.1029/2024GL109657
	Global Flash Droughts Characteristics: Onset, Duration, and Extent at Watershed Scales
	Neelam, Maheshwari; Hain, Christopher
发表日期	2024
ISSN	0094-8276
EISSN	1944-8007
起始页码	51
结束页码	10
卷号	51 期号:10
英文摘要	Addressing impacts of flash droughts (FDs) on the water-food nexus requires a understanding of FD mechanisms and drivers at the watershed level. Examining climatic drivers, dry and wet spell lengths from 1980 to 2019, we analyzed FD spatial and temporal characteristics, emphasizing areal extent, onset time, and duration. Our findings reveal substantial variations in FDs among different watersheds. Notably, watersheds in the Southern Hemisphere are witnessing expanding, faster-developing, and longer-lasting FDs, aligning with climate variations in precipitation and temperature. Additionally, at the watershed scale, the onset and duration of FDs are more influenced by the intensity (magnitude and variability) of climatic drivers than the average length of wet and dry periods. FD-extents, however, correlate with both climatic conditions and wet and dry periods, underscoring watershed connectivity. Ultimately, our results underscore the necessity for research to comprehend the interplay between FDs and watershed characteristics and how it manifests in overall water resource management. Flash droughts (FDs), which are sudden and severe dry periods, are causing problems for our water and food systems and making it harder to prepare for disasters. To address these challenges effectively, it is crucial to gain a thorough understanding of the underlying mechanisms and factors driving FDs at the watershed level. In this study, we looked at climatic patterns alongside the lengths of dry and wet periods spanning from 1980 to 2019. Our primary focus was on three key aspects: the extent of FDs, when they begin, and how long they persist. Our research findings demonstrate considerable variations in FDs occurrences across different regions. Notably, in the Southern Hemisphere, FDs are expanding rapidly, developing more swiftly, and enduring for extended periods, closely mirroring shifts in precipitation and temperature patterns. Interestingly, the onset and duration of FDs seem to depend more on the intensity of climatic factors than on how long it's been dry or wet. The expansion of FDs in a region is linked to both the climatic and dry/wet periods, emphasizing the geophysical connectivity within a watershed. Watersheds in tropical, temperate climates, and with savanna and grassland land cover are more susceptible to flash droughts (FDs) FDs extents are affected by intraannual precipitation variability, but not by intraannual air temperature variability The onset and duration of FD at the watershed scale are influenced more by climate variables, than average wet/dry spell periods
英文关键词	soil moisture; evapotranspiration; watershed; flash drought; climate variability; water management
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001223873700001
来源期刊	GEOPHYSICAL RESEARCH LETTERS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305958
作者单位	Universities Space Research Association (USRA); National Aeronautics & Space Administration (NASA); NASA Marshall Space Flight Center
推荐引用方式 GB/T 7714	Neelam, Maheshwari,Hain, Christopher. Global Flash Droughts Characteristics: Onset, Duration, and Extent at Watershed Scales[J],2024,51(10).
APA	Neelam, Maheshwari,&Hain, Christopher.(2024).Global Flash Droughts Characteristics: Onset, Duration, and Extent at Watershed Scales.GEOPHYSICAL RESEARCH LETTERS,51(10).
MLA	Neelam, Maheshwari,et al."Global Flash Droughts Characteristics: Onset, Duration, and Extent at Watershed Scales".GEOPHYSICAL RESEARCH LETTERS 51.10(2024).