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Service Description: The Gravity Recovery and Climate Experiment (GRACE) satellite mission was launched in March 2002 to map the temporal variations in the Earth’s global gravity field on a monthly basis. The variability in these gravity field solutions represents geophysical responses associated with redistribution of mass at or near the Earth’s surface, where mass variations are likely to occur on the time scales examined by GRACE measurements. Generally, the largest time-variable gravity signals observable in GRACE data are expected to come from changes in the distribution of water and snow stored on land. This project aims at utilizing temporal GRACE, TRMM, and Land Surface Model data to identify areas undergoing mass variations and investigating the factors controlling these variations. This was accomplished by examination and correlation of observations from temporal mass (GRACE data), precipitation (from TRMM) data, and Land Surface Model outputs with relevant geologic, hydrologeologic, topographic (DEMs), derived data (e.g., stream networks from digital topography) in a GIS environment. Our findings revealed: (1) central and northern sections of the MAS are experiencing high groundwater depletion rates (-4.2±1.1 mm/yr) and are currently over exploited, yet sustainable extraction could be achieved by reducing annual extraction by 2.4 km3, and (2) southern sections of the MAS (Rub Al Khali Aquifer System; RAKAS) are experiencing low groundwater depletion rates (eastern RAKAS: -1.6±0.4 mm/yr) to steady-state conditions (western RAKAS: 0.3±0.7 mm/yr). The first activity of the project entailed training of the SGS researchers. Following the training, the SGS and WMU scientists worked jointly on every task of this project. An article summarizing our collective findings is being considered for publication in the GSA Bulletin.
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Comments: The Gravity Recovery and Climate Experiment (GRACE) satellite mission was launched in March 2002 to map the temporal variations in the Earth’s global gravity field on a monthly basis. The variability in these gravity field solutions represents geophysical responses associated with redistribution of mass at or near the Earth’s surface, where mass variations are likely to occur on the time scales examined by GRACE measurements. Generally, the largest time-variable gravity signals observable in GRACE data are expected to come from changes in the distribution of water and snow stored on land. This project aims at utilizing temporal GRACE, TRMM, and Land Surface Model data to identify areas undergoing mass variations and investigating the factors controlling these variations. This was accomplished by examination and correlation of observations from temporal mass (GRACE data), precipitation (from TRMM) data, and Land Surface Model outputs with relevant geologic, hydrologeologic, topographic (DEMs), derived data (e.g., stream networks from digital topography) in a GIS environment. Our findings revealed: (1) central and northern sections of the MAS are experiencing high groundwater depletion rates (-4.2±1.1 mm/yr) and are currently over exploited, yet sustainable extraction could be achieved by reducing annual extraction by 2.4 km3, and (2) southern sections of the MAS (Rub Al Khali Aquifer System; RAKAS) are experiencing low groundwater depletion rates (eastern RAKAS: -1.6±0.4 mm/yr) to steady-state conditions (western RAKAS: 0.3±0.7 mm/yr). The first activity of the project entailed training of the SGS researchers. Following the training, the SGS and WMU scientists worked jointly on every task of this project. An article summarizing our collective findings is being considered for publication in the GSA Bulletin.
Subject: Use of GRACE Data to Estimate Temporal Changes in Terrestrial Water Storage (TWS) Across the Empty Quarter & Surroundings
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Keywords: Grace,Saudi
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