Monitoring Groundwater Storage Changes Using the Gravity Recovery and Climate Experiment (GRACE) Satellite Mission: A Review

Frappart, Frédéric; Ramillien, Guillaume

doi:10.3390/rs10060829

Cited by 218 publications

(127 citation statements)

References 134 publications

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“…Every month, satellite-derived water levels at all six VSs are linearly interpolated over the inundated pixels detected in the corresponding MODIS-derived surface water extent map to estimate the surface water level at each grid point of 500 m MODIS spatial resolution following the approach developed by Frappart et al 62 . This approach was also applied successfully in other basins worldwide [63][64][65] . Then, we successfully constructed monthly surface water level maps of Lake Chad at 500 m spatial resolution for the 2003-2015 period.…”

Section: Methodsmentioning

confidence: 99%

“…The spatial temporal variation of TWS and root zone soil moisture are estimated using GRACE and GLEAM dataset, respectively, and the variation of SWS is estimated using Eq. (2) 64,67 . Therefore, monthly variation of groundwater can be calculated as the difference between variations of TWS, and root zone soil moisture and SWS (Eq.…”

Section: Methodsmentioning

confidence: 99%

“…Uncertainties of this study. The decomposition technique employed in the present study to estimate groundwater is commonly used (see the review from Frappart & Ramillien 64 on GRACE and groundwater for instance), and several specific regional studies proved that it is a powerful tool [68][69][70] . Following Frappart et al 69 , the uncertainty on groundwater storage variations can be computed as follows: Based on Ramillien et al 71 , we assumed that σ TWS < 0.015 m over semi-arid area.…”

Section: Methodsmentioning

confidence: 99%

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The Lake Chad hydrology under current climate change

Pham-Duc

Sylvestre

Papa

et al. 2020

Sci Rep

Self Cite

104

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Lake Chad, in the Sahelian zone of west-central Africa, provides food and water to ~50 million people and supports unique ecosystems and biodiversity. In the past decades, it became a symbol of current climate change, held up by its dramatic shrinkage in the 1980s. Despites a partial recovery in response to increased Sahelian precipitation in the 1990s, Lake Chad is still facing major threats and its contemporary variability under climate change remains highly uncertain. Here, using a new multi-satellite approach, we show that Lake Chad extent has remained stable during the last two decades, despite a slight decrease of its northern pool. Moreover, since the 2000s, groundwater, which contributes to ~70% of Lake Chad’s annual water storage change, is increasing due to water supply provided by its two main tributaries. Our results indicate that in tandem with groundwater and tropical origin of water supply, over the last two decades, Lake Chad is not shrinking and recovers seasonally its surface water extent and volume. This study provides a robust regional understanding of current hydrology and changes in the Lake Chad region, giving a basis for developing future climate adaptation strategies.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

The Lake Chad hydrology under current climate change

Pham-Duc

Sylvestre

Papa

et al. 2020

Sci Rep

Self Cite

104

View full text Add to dashboard Cite

show abstract

“…The new GRACE follow on (GRACE-FO) project has now been launched (Frappart and Ramillien, 2018;Tapley et al, 2019), providing an opportunity to augment the existing GRACE ∆TWS dataset without recourse to modelling (Ahmed et al, 2019) and to give greater certainty in linking 550 climate-groundwater dynamics to decadal and longer timescale climate systems including the Pacific Decadal Oscillation and Atlantic Multidecadal Oscillation (Wunsch, 1999). An extended dataset will improve the calibration of HM as it relates to specific aquifer systems, providing a robust context for monitoring ∆GWS, including groundwater decline, in real time and protecting fundamentally important groundwater resources.…”

Section: Discussionmentioning

confidence: 99%

Climate-groundwater dynamics inferred from GRACE and the role of hydraulic memory

Opie¹,

Taylor²,

Brierley³

et al. 2020

Preprint

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Abstract. Groundwater is the largest store of freshwater on Earth after the cryosphere and provides a substantial proportion of the water used for domestic, irrigation and industrial purposes. Knowledge of this essential resource remains incomplete, in part, because of observational challenges of scale and accessibility. Here we examine a 14-year period (2002–2016) of GRACE observations to investigate climate-groundwater dynamics of 14 tropical and sub-tropical aquifers selected from WHYMAP's 37 large aquifer systems of the world. GRACE-derived changes in groundwater storage resolved using GRACE JPL Mascons and the CLM Land Surface Model are related to precipitation time series and regional-scale hydrogeology. We show that aquifers in dryland environments exhibit long-term hydraulic memory through a strong correlation between groundwater storage changes and annual precipitation anomalies integrated over the time series; aquifers in humid environments show short-term memory through strong correlation with monthly precipitation. This classification is consistent with estimates of Groundwater Response Times calculated from the hydrogeological properties of each system, with long (short) hydraulic memory associated with slow (rapid) response times. The results suggest that groundwater systems in dryland environments may be less sensitive to seasonal climate variability but vulnerable to long-term trends from which they will be slow to recover. In contrast, aquifers in humid regions may be more sensitive to seasonal climate disturbances such as ENSO-related drought but may also be relatively quick to recover. Exceptions to this general pattern are traced to human interventions through groundwater abstraction. Hydraulic memory is an important factor in the management of groundwater resources, particularly under climate change.

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“…GRACE-derived TWS may be considered analogous to the traditional water budget storage (∆S). By removing the surface water and soil moisture components using either in-situ data, remote sensing observations, or Land Surface Model (LSM) outputs, the GWS can be isolated [33,39] as,…”

Section: Grace Tws Anomaliesmentioning

confidence: 99%

Assessment of Physical Water Scarcity in Africa Using GRACE and TRMM Satellite Data

et al. 2019

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The critical role of water in enabling or constraining human well-being and socioeconomic activities has led to an interest in quantitatively establishing the status of water (in)sufficiency over space and time. Falkenmark introduced the first widely accepted measure of water status, the Water Scarcity Index (WSI), which expressed the status of the availability of water resources in terms of vulnerability, stress, and scarcity. Since then, numerous indicators have been introduced, but nearly all adopt the same basic formulation; water status is a function of “available water” resource—by the demand or use. However, the accurate assessment of “available water” is difficult, especially in data-scarce regions, such as Africa. In this paper, therefore, we introduce a satellite-based Potential Available Water Storage indicator, PAWS. The method integrates GRACE (Gravity Recovery and Climate Experiment) satellite Total Water Storage (TWS) measurements with the Tropical Rainfall Measuring Mission (TRMM) precipitation estimates between 2002 and 2016. First, we derived the countries’ Internal Water Storage (IWS) using GRACE and TRMM precipitation data. Then, the IWS was divided by the population density to derive the PAWS per capita. Following the Falkenmark thresholds, 54% of countries are classified in the same water vulnerability status as the AQUASTAT Internal Renewable Water Resources (IRWR) method. Of the remaining countries, PAWS index leads to one or two categories shift (left or right) of water status. The PAWS index shows that 14% (~160 million people) of Africa’s population currently live under water scarcity status. With respect to future projections, PAWS index suggests that a 10% decrease in future water resources would affect ~37% of Africa’s 2025 population (~600 million people), and 57% for 2050 projections (~1.4-billion people). The proposed approach largely overcomes the constraints related to the data needed to rapidly and robustly estimate available water resources by incorporating all stocks of water within the country, as well as underscores the recent water storage dynamics. However, the estimates obtained concern potential available water resources, which may not be utilizable for practical, economic, and technological issues.

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Monitoring Groundwater Storage Changes Using the Gravity Recovery and Climate Experiment (GRACE) Satellite Mission: A Review

Cited by 218 publications

References 134 publications

The Lake Chad hydrology under current climate change

The Lake Chad hydrology under current climate change

Climate-groundwater dynamics inferred from GRACE and the role of hydraulic memory

Assessment of Physical Water Scarcity in Africa Using GRACE and TRMM Satellite Data

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