Paper Info
Title
Long-Term Water Storage Changes of Lake Volta from GRACE and Satellite Altimetry and Connections with Regional Climate.
Abstract
Satellite gravity data from the Gravity Recovery and Climate Experiment (GRACE) provides a quantitative measure of terrestrial water storage (TWS) change at different temporal and spatial scales. In this study, we investigate the ability of GRACE to quantitatively monitor long-term hydrological characteristics over the Lake Volta region. Principal component analysis (PCA) is employed to study temporal and spatial variability of long-term TWS changes. Long-term Lake Volta water storage change appears to be the dominant long-term TWS change signal in the Volta basin. GRACE-derived TWS changes and precipitation variations compiled by the Global Precipitation Climatology Centre (GPCC) are related both temporally and spatially, but spatial leakage attenuates the magnitude of GRACE estimates, especially at small regional scales. Using constrained forward modeling, we successfully remove leakage error in GRACE estimates. After this leakage correction, GRACE-derived Lake Volta water storage changes agree remarkably well with independent estimates from satellite altimetry at interannual and longer time scales. This demonstrates the value of GRACE estimates to monitor and quantify water storage changes in lakes, especially in relatively small regions with complicated topography.
Year
DOI
Venue
2017
10.3390/rs9080842
REMOTE SENSING
Keywords
Field
DocType
GRACE,Lake Volta,water storage changes,precipitation,leakage error,forward modeling
Satellite altimetry,Magnitude (mathematics),Satellite,Remote sensing,Water storage,Spatial variability,Climatology,Geology,Structural basin,Precipitation
Journal
Volume
Issue
ISSN
9
8
2072-4292
Citations 
PageRank 
References 
3
0.54
0
Authors
4
Name
Order
Citations
PageRank
Shengnan Ni130.54
Jianli Chen25017.23
Clark R. Wilson330.88
Xiaogong Hu435.61