1. When climate variability partly compensates for groundwater depletion: An analysis of the GRACE signal in Morocco
- Author
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Ouatiki, Hamza, Boudhar, Abdelghani, Leblanc, Marc, Fakir, Younes, Chehbouni, Abdelghani, Université Mohammed VI Polytechnique [Ben Guerir] (UM6P), Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH), Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Gestion de l'Eau, Acteurs, Usages (UMR G-EAU), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Institut de Recherche pour le Développement (IRD)-AgroParisTech-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Montpellier, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université Cadi Ayyad [Marrakech] (UCA), Centre d'études spatiales de la biosphère (CESBIO), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and This study was supported by the 'MorSnow-1' research program within the International Water Research Institute (IWRI) , Mohammed VI Polytechnic University (UM6P) , Morocco (Accord specifique n? 39 entre OCP S.A et UM6P) , the 'African Geospatial Data Portal Frameworks For Science, Capacity-Building And Decision-Making Purposes' project within the Center for Remote Sensing Applications (CRSA-UM6P) , Morocco (Accord specifique no 89 entre OCP S.A et UM6P) , and by the Continental Surfaces and Interfaces in the Mediterranean Area (SICMED) program.
- Subjects
GRACE ,GRACE versus climate ,Groundwater depletion ,[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology ,[SDE]Environmental Sciences ,Earth and Planetary Sciences (miscellaneous) ,Changepoint ,Natural recharge ,Water Science and Technology - Abstract
International audience; Since April 2002, the Gravity Recovery and Climate Experiment (GRACE) mission have opened new pathways for hydrologists to monitor the changes in terrestrial total water storage (TWS). Here, the Center for Space Research (CSR), Goddard Space Flight Center (GSFC), Jet Propulsion Laboratory (JPL), and the average (AVG) GRACE mascon solutions were used to examine the changes in TWS and groundwater storages (GWS) in Morocco, with an emphasis on natural replenishment events and their link to snow cover area (SCA) and rainfall variability. New hydrological insights for the region: The results showed that GRACE TWS from AVG (TWS AVG) and GSFC (TWS GSFC) can fairly describe the temporal patterns of the groundwater level (GWL). Moreover, during 2002-2020, the TWS underwent a strong depletion relatively masked by natural recharge events. This was revealed as we identified two intermittent depletion episodes with statistically significant rates (− 1.03 ± 0.11 to − 0.31 ± 0.1 cm yr − 1) higher than those obtained for the long-term trend lines (− 0.28 ± 0.11 to − 0.15 ± 0.07 cm yr − 1). The TWS appeared to be strongly linked with the SCA metrics and rainfall indices with 1-3 months of lag. Our findings suggest that the rainfall distribution can be more insightful about changes in groundwater levels compared to the rainfall monthly totals.
- Published
- 2022
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