GNSS Geodesy Quantifies Water-Storage Gains and Drought Improvements in California Spurred by Atmospheric Rivers

Hilary R. Martens, Nicholas Lau, Matthew J. Swarr, Donald F. Argus, Qian Cao, Zachary M. Young, Adrian A. Borsa, Ming Pan, Anna M. Wilson, Ellen Knappe, F. Martin Ralph, W. Payton Gardner

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Atmospheric rivers (ARs) deliver significant and essential precipitation to the western United States (US) with consequential interannual variability. The intensity and frequency of ARs strongly influence reservoir levels, mountain snowpack, and groundwater recharge, which are key drivers of water-resource availability and natural hazards. Between October 2022 and April 2023, western states experienced exceptionally heavy precipitation from several families of powerful ARs. Using observations of surface-loading deformation from Global Navigation Satellite Systems, we find that terrestrial water-storage gains exceeded 100% of normal within vital California watersheds. Independent water-storage solutions derived from different data-analysis and inversion methods provide an important measure of precision. The sustained storage increases, which we show are closely associated with ARs at daily-to-weekly timescales, alleviated both meteorological and hydrological drought conditions in the region, with a lag in hydrological-drought improvements. Quantifying water-storage recovery associated with extreme precipitation after drought advances understanding of an increasingly variable hydrologic cycle.

Original languageEnglish
Article numbere2023GL107721
JournalGeophysical Research Letters
Volume51
Issue number13
DOIs
StatePublished - Jul 16 2024

Keywords

  • GNSS
  • GPS
  • atmospheric rivers
  • hydrogeodesy
  • hydrological drought
  • surface loading

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