Publications related to the GRACE Missions (no abstracts)

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Reproducing GRACE Total Water Storage Change at Finer Spatial Scales

Li, Fupeng and Kusche, Jürgen, 2026. Reproducing GRACE Total Water Storage Change at Finer Spatial Scales. Geophysical Research Letters, 53(1):e2025GL119881, doi:10.1029/2025GL119881.

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@ARTICLE{2026GeoRL..5319881L,
       author = {{Li}, Fupeng and {Kusche}, J{\"u}rgen},
        title = "{Reproducing GRACE Total Water Storage Change at Finer Spatial Scales}",
      journal = {\grl},
         year = 2026,
        month = jan,
       volume = {53},
       number = {1},
          eid = {e2025GL119881},
        pages = {e2025GL119881},
     abstract = "{The Gravity Recovery and Climate Experiment (GRACE) satellite mission
        provides accurate observations of terrestrial water storage
        anomalies (TWSA), but their coarse spatial resolution
        ({\ensuremath{\sim}}3{\textdegree}) limits sub-regional-scale
        applications. Existing downscaling methods rely on high-
        resolution hydrometeorological inputs, which often underestimate
        the full magnitude of GRACE signals. Here, we develop a machine-
        learning-based iterative downscaling method that reproduces TWSA
        at 0.25{\textdegree} resolution while retaining nearly all of
        the original GRACE signals, using ERA5 soil moisture,
        precipitation, and temperature as inputs. We find that the
        downscaled TWSA has improved agreement with in situ groundwater
        levels compared to the original GRACE data, with higher
        correlation at over 63\% of wells and reduced RMSE at more than
        83\% globally. The downscaled TWSA also retains an average
        correlation of 0.99 with original GRACE data at the basin scale,
        outperforming a previously released downscaling product. The
        downscaled TWSA data set is publicly available at
        https://doi.org/10.5281/zenodo.17265162.}",
          doi = {10.1029/2025GL119881},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2026GeoRL..5319881L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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