globalchange  > 气候变化事实与影响
DOI: 10.5194/hess-21-4533-2017
Scopus记录号: 2-s2.0-85029458100
论文题名:
Recent changes in terrestrial water storage in the Upper Nile Basin: An evaluation of commonly used gridded GRACE products
作者: Shamsudduha M; , Taylor R; G; , Jones D; , Longuevergne L; , Owor M; , Tindimugaya C
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期:9
起始页码: 4533
结束页码: 4549
语种: 英语
Scopus关键词: Crystalline rocks ; Data handling ; Digital storage ; Groundwater ; Lakes ; Moisture ; NASA ; Soil moisture ; Uncertainty analysis ; Water conservation ; Gravity recovery and climate experiments ; Groundwater storage ; In-situ observations ; Land data assimilation systems ; Moisture storage ; Processing strategies ; Terrestrial water storage ; Time-series data ; Geodetic satellites ; amplitude ; data processing ; GRACE ; groundwater ; in situ measurement ; satellite data ; soil moisture ; terrestrial environment ; water storage ; East African Lakes ; Lake Kyoga ; Lake Victoria ; South Sudan ; Uganda ; Upper Nile
英文摘要: GRACE (Gravity Recovery and Climate Experiment) satellite data monitor large-scale changes in total terrestrial water storage (ΔTWS), providing an invaluable tool where in situ observations are limited. Substantial uncertainty remains, however, in the amplitude of GRACE gravity signals and the disaggregation of TWS into individual terrestrial water stores (e.g. groundwater storage). Here, we test the phase and amplitude of three GRACE ΔTWS signals from five commonly used gridded products (i.e. NASA's GRCTellus: CSR, JPL, GFZ; JPL-Mascons; GRGS GRACE) using in situ data and modelled soil moisture from the Global Land Data Assimilation System (GLDAS) in two sub-basins (LVB: Lake Victoria Basin; LKB: Lake Kyoga Basin) of the Upper Nile Basin. The analysis extends from January 2003 to December 2012, but focuses on a large and accurately observed reduction in ΔTWS of 83km3 from 2003 to 2006 in the Lake Victoria Basin. We reveal substantial variability in current GRACE products to quantify the reduction of ΔTWS in Lake Victoria that ranges from 80km3 (JPL-Mascons) to 69 and 31km3 for GRGS and GRCTellus respectively. Representation of the phase in TWS in the Upper Nile Basin by GRACE products varies but is generally robust with GRGS, JPL-Mascons, and GRCTellus (ensemble mean of CSR, JPL, and GFZ time-series data), explaining 90, 84, and 75% of the variance respectively in "in situ" or "bottom-up" ΔTWS in the LVB. Resolution of changes in groundwater storage (ΔGWS) from GRACE ΔTWS is greatly constrained by both uncertainty in changes in soil-moisture storage (ΔSMS) modelled by GLDAS LSMs (CLM, NOAH, VIC) and the low annual amplitudes in ΔGWS (e.g. 1.8-4.9cm) observed in deeply weathered crystalline rocks underlying the Upper Nile Basin. Our study highlights the substantial uncertainty in the amplitude of ΔTWS that can result from different data-processing strategies in commonly used, gridded GRACE products; this uncertainty is disregarded in analyses of ΔTWS and individual stores applying a single GRACE product. © Author(s) 2017.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79062
Appears in Collections:气候变化事实与影响

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作者单位: Institute for Risk and Disaster Reduction, University College London, London, United Kingdom; Department of Geography, University College London, London, United Kingdom; Centre for Geography, Environment and Society, University of Exeter, Exeter, United Kingdom; CNRS - UMR 6118 Géosciences Rennes, Université de Rennes 1, Rennes, France; Department of Geology and Petroleum Studies, Makerere University, Kampala, Uganda; DWRM, Ministry of Water and Environment, Entebbe, Uganda

Recommended Citation:
Shamsudduha M,, Taylor R,G,et al. Recent changes in terrestrial water storage in the Upper Nile Basin: An evaluation of commonly used gridded GRACE products[J]. Hydrology and Earth System Sciences,2017-01-01,21(9)
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