Geological Society of America

T327 Remote Sensing Applications in Hydrology and Geology

Wednesday, 25 October 2017
1:30 PM - 5:30 PM
Room 615/616/617

COMPARISON OF LAND WATER STORAGE CHANGES FROM GLOBAL HYDROLOGIC AND LAND SURFACE MODELS WITH OUTPUT FROM NEW GRACE SATELLITE SOLUTIONS

Paper number: T327-4
Program: Technical Sessions
Time: 2:20 PM – 2:35 PM

Authors

Bridget Scanlon Presenting Author
University of Texas at Austin, Austin, TX
Zizhan Zhang
Chinese Academy of Sciences, Wuhan
Himanshu Save
University of Texas at Austin, Austin, TX
Robert Reedy
University of Texas at Austin, Austin, TX
Alex Sun
University of Texas at Austin, Austin, TX
Hannes Muller-Schmied
Institute of Physical Geography, Goethe University Frankfurt, Frankfurt
Ludovicus P.H. Van Beek
Utrecht University, Utrecht
David Wiese
Pasadena, CA

Abstract

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.

Geological Society of America Abstracts with Programs. Vol. 49, No. 6

doi: 10.1130/abs/2017AM-306050

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