Christopher is grateful to the American Geophysical Union (AGU) grant sponsored by NASA and National Science Foundation in collaboration with The Ohio State University and several other international agencies. This funding supported his keynote speech at the AGU Chapman conference held in Washington DC, USA, in September 2018. The authors further thank NASA for the three GRACE mascon products, NOAA for the satellite precipitation and sea surface temperature, and GRDC for the discharge data used in this study.
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