edu.ucar.opensky::articles:23947 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T06:38:14.093616 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7z89grn https://doi.org/10.18738/T8/JSUIJT https Related Dataset #1 Data file for "Comparison of Groundwater Storage Changes from GRACE Satellites with Monitoring and Modeling of Major U.S. Aquifers" Comparison of groundwater storage changes from GRACE satellites with monitoring and modeling of major U.S. aquifers 2020-12-24T00:00:00Z publication https://n2t.org/ark:/85065/d7z89grn https://doi.org/10.1029/2020WR027556 Rateb, A. author Scanlon, B. R. author Pool, D. R. author Sun, A. author Zhang, Z. author Chen, J. author Clark, B. author Faunt, C. C. author Haugh, C. J. author Hill, M. author Hobza, C. author McGuire, V. L. author Reitz, M. author Müller Schmied, H. author Sutanudjaja, E. H. author Swenson, Sean author Wiese, D. author Xia, Y. author Zell, W. author UCAR/NCAR - Library publisher GRACE satellite data are widely used to estimate groundwater storage (GWS) changes in aquifers globally; however, comparisons with GW monitoring and modeling data are limited. Here we compared GWS changes from GRACE over 15 yr (2002-2017) in 14 major U.S. aquifers with groundwater-level (GWL) monitoring data in similar to 23,000 wells and with regional and global hydrologic and land surface models. Results show declining GWS trends from GRACE data in the six southwestern and south-central U.S. aquifers, totaling -90 km(3) over 15 yr, related to long-term (5-15 yr) droughts, and exceeding Lake Mead volume by similar to 2.5x. GWS trends in most remaining aquifers were stable or slightly rising. GRACE-derived GWS changes agree with GWL monitoring data in most aquifers (correlation coefficients, R = 0.52-0.95), showing that GRACE satellites capture groundwater (GW) dynamics. Regional GW models (eight models) generally show similar or greater GWS trends than those from GRACE. Large discrepancies in the Mississippi Embayment aquifer, with modeled GWS decline approximately four times that of GRACE, may reflect uncertainties in model storage parameters, stream capture, pumpage, and/or recharge rates. Global hydrologic models (2003-2014), which include GW pumping, generally overestimate GRACE GWS depletion (total: approximately -172 to -186 km(3)) in heavily exploited aquifers in southwestern and south-central U.S. by similar to 2.4x (GRACE: -74 km(3)), underscoring needed modeling improvements relative to anthropogenic impacts. Global land surface models tend to track GRACE GWS dynamics better than global hydrologic models. Intercomparing remote sensing, monitoring, and modeling data underscores the importance of considering all data sources to constrain GWS uncertainties. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2020 American Geophysical Union. None eng geoscientificInformation