[Seminar on June 15] Global Water Resource Assessments: Comparison of Models to GRACE Satellites
Dr. Bridget R. Scanlon
Jackson School of Geosciences,
University of Texas at Austin
10am, June 15, 2018
Room 319, Building 40, IAP
Increasing interest in global hydrology based on modeling and remote sensing underscores the need to compare results from these two approaches. Here we compare simulated land Total Water Storage anomalies (TWSA) from global hydrologic models (WGHM and PRC-GLOBWB) and land surface models (NOAH, MOSAIC, VIC, CLM, CLSM) to TWSA from newly released Gravity Recovery and Climate Experiment (GRACE) mascons solutions from Univ. of Texas Center for Space Research (CSR) and NASA Jet Propulsion Lab and from traditional spherical harmonic solutions. There is generally good agreement between modeled and GRACE-derived trends in TWSA in the midrange (within ±0.5 km3/yr) but models underestimate large declining and rising trends outside this range. Even global hydrologic models with human water use (PCR-GLOBWB and WGHM) show large differences in magnitude and direction of TWSA trends for many basins. There is much better agreement in seasonal amplitudes in TWSA between models and GRACE. Modeling human water use is important for long-term trends in many basins but not for seasonal amplitudes. This work will advance GRACE data processing and future model development that should provide improved understanding of global water resources.
Bridget Scanlon is a Senior Research Scientist at the Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin. Her degrees are in Geology with a focus on hydrogeology with a B.A. Mod. from Trinity College, Dublin (1980); M.Sc. from the Univ. of Alabama (1983), and Ph.D. from the Univ. of Kentucky (1985). She has worked at the Univ. of Texas since 1987. Her current research focuses on various aspects of water resources, including global assessments using satellites and modeling, management related to climate extremes, and water energy interdependence. She serves an Associate Editor for Water Resources Research and Environmental Research Letters and has authored or co-authored 100 publications. Dr. Scanlon is a Fellow of the American Geophysical Union and the Geological Society of America and a member of the National Academy of Engineering.