recent changes in terrestrial water storage in the upper nile basin: an evaluation of commonly used gridded grace products
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2017
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Abstract
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 83 km3 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
80 km3 (JPL-Mascons) to 69 and 31 km3 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. 1.8–4.9 cm)
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.
| Reference Key |
shamsudduha2017hydrologyrecent
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|---|---|
| Authors | ;M. Shamsudduha;M. Shamsudduha;R. G. Taylor;D. Jones;L. Longuevergne;M. Owor;C. Tindimugaya |
| Journal | materials research bulletin |
| Year | 2017 |
| DOI |
10.5194/hess-21-4533-2017
|
| URL | |
| Keywords |
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