H44F-03
Monitoring groundwater drought with GRACE data assimilation
Thursday, 17 December 2015: 16:30
3022 (Moscone West)
Bailing Li1,2, Matthew Rodell3, Hiroko K Beaudoing3, Augusto Getirana4 and Benjamin F Zaitchik5, (1)Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States, (2)NASA GSFC, Greenbelt, MD, United States, (3)NASA/GSFC, Greenbelt, MD, United States, (4)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (5)Johns Hopkins University, Baltimore, MD, United States
Abstract:
Groundwater drought is a distinct class of drought, not a sub-class of meteorological, agricultural and hydrological drought and has profound impacts on natural environments and societies. Due to a deficiency of in situ measurements, we developed a groundwater drought indicator using groundwater change estimates derived by assimilating GRACE derived terrestrial water storage (TWS) anomalies into the NASA Catchment land surface model. Data assimilation enables spatial and temporal downscaling of coarse GRACE TWS observations (monthly and ~150,000 km2 effective spatial resolution) and extrapolation to near-real time. In this talk, we will present our latest progress on using GRACE satellite data for groundwater drought monitoring in the U.S. and globally. Characteristics of this groundwater drought indicator will be discussed, including its relationship with other types of drought and how they are influenced by model physics and climate conditions. Results are evaluated using in situ groundwater observations.
