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Using GRACE in a streamflow recession to determine drainable water storage in the Mississippi River basin

Abstract. The study of the relationship between water storage and
runoff generation has long been a focus of the hydrological sciences. NASA's
Gravity Recovery and Climate Experiment (GRACE) mission provides monthly
depth-integrated information on terrestrial water storage anomalies derived
from time-variable gravity observations. As the first basin-scale storage
measurement technique, these data offer potentially novel insight into the
storage–discharge relationship. Here, we apply GRACE data in a streamflow
recession analysis with river discharge measurements across several
subdomains of the Mississippi River basin. Nonlinear regression analysis
was used for 12 watersheds to determine that the fraction of baseflow in
streams during non-winter months varies from 52 % to 75 % regionally.
Additionally, the first quantitative estimate of absolute drainable water
storage was estimated. For the 2002–2014 period, the drainable storage in
the Mississippi River basin ranged from 2900±400 to 3600±400 km3.
