DOI: 10.1038/ngeo2868
论文题名: The global distribution and dynamics of surface soil moisture
作者: McColl K.A. ; Alemohammad S.H. ; Akbar R. ; Konings A.G. ; Yueh S. ; Entekhabi D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 2 起始页码: 100
结束页码: 104
语种: 英语
Scopus关键词: arid region
; drought
; extreme event
; flood
; heat wave
; hydrological cycle
; land surface
; soil moisture
; soil water
; water budget
英文摘要: Surface soil moisture has a direct impact on food security, human health and ecosystem function. It also plays a key role in the climate system, and the development and persistence of extreme weather events such as droughts, floods and heatwaves. However, sparse and uneven observations have made it difficult to quantify the global distribution and dynamics of surface soil moisture. Here we introduce a metric of soil moisture memory and use a full year of global observations from NASA's Soil Moisture Active Passive mission to show that surface soil moisture - a storage believed to make up less than 0.001% of the global freshwater budget by volume, and equivalent to an, on average, 8-mm thin layer of water covering all land surfaces - plays a significant role in the water cycle. Specifically, we find that surface soil moisture retains a median 14% of precipitation falling on land after three days. Furthermore, the retained fraction of the surface soil moisture storage after three days is highest over arid regions, and in regions where drainage to groundwater storage is lowest. We conclude that lower groundwater storage in these regions is due not only to lower precipitation, but also to the complex partitioning of the water cycle by the surface soil moisture storage layer at the land surface. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105854
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Civil and Environmental Engineering, MIT, Cambridge, MA, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Earth System Science, Stanford University, Stanford, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Earth, Atmospheric and Planetary Sciences, MIT, Cambridge, MA, United States
Recommended Citation:
McColl K.A.,Alemohammad S.H.,Akbar R.,et al. The global distribution and dynamics of surface soil moisture[J]. Nature Geoscience,2017-01-01,10(2)