Large-scale variations of global groundwater from satellite gravimetry and hydrological models, 2002-2012

CORC > 上海天文台 > 中国科学院上海天文台 > 空间导航与定位技术重点实验室

	Large-scale variations of global groundwater from satellite gravimetry and hydrological models, 2002-2012
	Jin, Shuanggen1 ; Feng, Guiping1,2
刊名	GLOBAL AND PLANETARY CHANGE
	2013-07-01
卷号	106 页码:20-30
关键词	Climate change GRACE Groundwater Hydrological models
英文摘要	Groundwater storage is an important parameter in water resource management, land-surface processes and hydrological cycle. However, the traditional instruments are very difficult to monitor global groundwater storage variations due to high cost and strong labor intensity. In this paper, the global total terrestrial water storage (TWS) is derived from approximately 10 years of monthly geopotential coefficients from GRACE observations (2002 August-2012 April), and the groundwater storage is then obtained by subtracting the surface water, soil moisture, snow, ice and canopy water from the hydrological models GLDAS (Global Land Data Assimilation System) and WGHM (WaterGAP Global Hydrology Model). The seasonal, secular and acceleration variations of global groundwater storage are investigated from about 10 years of monthly groundwater time series. Annual and semiannual amplitudes of GRACE-WGHM and GRACE-GLDAS are almost similar, while WGHM groundwater results are much smaller. The larger annual amplitude of groundwater variations can be up to 80 mm, e.g., in Amazon and Zambezi Basins, and the smaller annual amplitude of groundwater variations is less than 10 mm, e.g., in Northern Africa with larger deserts. The annual and semi-annual phases agree remarkably well for three independent results. In the most parts of the world, the groundwater reaches the maximum in September-October each year and the minimum in March-April. The mean trend and acceleration of global groundwater storage variations are 1.86 mm/y and -0.28 mm/y(2) from GRACE-GLDAS, and 1.20 mm/y and -0.18 mm/y(2) from GRACE-WGHM, respectively, while the WGHM model underestimates the trend and acceleration. Meanwhile the GRACE-GLDAS is generally closer to in-situ observations in Illinois and satellite altimetry. Therefore, the GRACE-GLDAS provides the relatively reliable data set of global groundwater storage, which enables to detect large-scale variations of global groundwater storage. (C) 2013 Elsevier B.V. All rights reserved.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary
研究领域[WOS]	Physical Geography ; Geology
关键词[WOS]	CLIMATE EXPERIMENT GRACE ; GRAVITY RECOVERY
收录类别	SCI
语种	英语
WOS记录号	WOS:000320490800003
公开日期	2014-08-15
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/14965]
专题	上海天文台_空间导航与定位技术重点实验室
作者单位	1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Jin, Shuanggen,Feng, Guiping. Large-scale variations of global groundwater from satellite gravimetry and hydrological models, 2002-2012[J]. GLOBAL AND PLANETARY CHANGE,2013,106:20-30.
APA	Jin, Shuanggen,&Feng, Guiping.(2013).Large-scale variations of global groundwater from satellite gravimetry and hydrological models, 2002-2012.GLOBAL AND PLANETARY CHANGE,106,20-30.
MLA	Jin, Shuanggen,et al."Large-scale variations of global groundwater from satellite gravimetry and hydrological models, 2002-2012".GLOBAL AND PLANETARY CHANGE 106(2013):20-30.