干旱区生态环境知识资源中心(Arid): Snowfall Replenishes Groundwater Loss in the Great Basin of the Western United States, but Cannot Compensate for Increasing Aridification

Arid

DOI	10.1029/2023GL107913
	Snowfall Replenishes Groundwater Loss in the Great Basin of the Western United States, but Cannot Compensate for Increasing Aridification
	Hall, Dorothy K.; Loomis, Bryant D.; Digirolamo, Nicolo E.; Forman, Barton A.
通讯作者	Hall, DK
来源期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2024
卷号	51 期号:6
英文摘要	There has been an acceleration of groundwater loss in the Great Basin (GB) of the western U.S. as determined from total water storage (TWS) measurements from the GRACE/FO satellite missions. From 2002 to 2023, there was a loss of TWS in the GB of similar to 68.7 km3 which is more than six times the current volume of the Lake Mead Reservoir. In this arid/semi-arid region, groundwater is the primary factor contributing to the decade-scale decline in TWS. Stronger declining trends are found in the western versus the eastern GB. Snow loading is the major cause of seasonal fluctuations of TWS in the GB. Despite annual replenishment of groundwater by snow, the downward trend persists even in notable snow years. Likely causes include declining snow mass, upstream water diversions and increased evaporation/sublimation due to increasing temperatures. Dire consequences for humans and wildlife are associated with this large loss of groundwater. The 21st Century megadrought in the southwestern U.S. caused a dramatic acceleration of groundwater loss in the Great Basin (GB) of the western U.S. as determined from changes in the Earth's gravity measured by the GRACE satellites. Groundwater is a major component of total water storage (TWS) in the GB, but snowfall and snowmelt are the major causes of seasonal fluctuations of TWS. As a snowpack accumulates or melts, water is redistributed causing a rapid regional change in gravity that can be measured from space. From 2002 to 2023, there is a substantial loss of groundwater in the GB of similar to 68.7 km3 which is more than six times the current volume of water in the Lake Mead Reservoir in Arizona/Nevada. Stronger declining trends of groundwater loss are found in the western part of the GB while weaker declining trends are found in the eastern part. Despite annual replenishment by snowfall, even in notable snow years like 2010-2011, 2016-2017, 2018-2019, and 2022-2023, the downward trend of groundwater depletion persists. Likely causes for this decline include declining snow mass, upstream water diversions and increased evaporation/sublimation due to increasing air and surface temperatures. Groundwater depletion is associated with dire consequences for humans and wildlife. Snow accumulation in the Great Basin (GB) triggers an increase in total water storage (TWS) while snow ablation triggers a drop in TWS There is an 68.7 km3 loss of groundwater in the GB from 2002 to 2023 which is more than six times greater than the current volume of Lake Mead The 2002-2023 TWS decline in the GB is more pronounced in the western GB than in the eastern GB
英文关键词	Great Basin GRACE snow drought groundwater MODIS
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001187488000001
WOS关键词	EARTHS ROTATION ; DEPLETION ; DECLINE ; GRACE ; LAKE
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403952
推荐引用方式 GB/T 7714	Hall, Dorothy K.,Loomis, Bryant D.,Digirolamo, Nicolo E.,et al. Snowfall Replenishes Groundwater Loss in the Great Basin of the Western United States, but Cannot Compensate for Increasing Aridification[J],2024,51(6).
APA	Hall, Dorothy K.,Loomis, Bryant D.,Digirolamo, Nicolo E.,&Forman, Barton A..(2024).Snowfall Replenishes Groundwater Loss in the Great Basin of the Western United States, but Cannot Compensate for Increasing Aridification.GEOPHYSICAL RESEARCH LETTERS,51(6).
MLA	Hall, Dorothy K.,et al."Snowfall Replenishes Groundwater Loss in the Great Basin of the Western United States, but Cannot Compensate for Increasing Aridification".GEOPHYSICAL RESEARCH LETTERS 51.6(2024).