Publications related to the GRACE Missions (no abstracts)

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Multi-Temporal Scale Global Gravity Field Determination From GRACE Follow-On: Pentad Polar Regions and Monthly Low-to-Mid Latitudes

Lee, Daeha, Han, Shin-Chan, and Seo, Ki-Weon, 2025. Multi-Temporal Scale Global Gravity Field Determination From GRACE Follow-On: Pentad Polar Regions and Monthly Low-to-Mid Latitudes. Journal of Geophysical Research (Solid Earth), 130(10):e2025JB031186, doi:10.1029/2025JB031186.

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@ARTICLE{2025JGRB..13031186L,
       author = {{Lee}, Daeha and {Han}, Shin-Chan and {Seo}, Ki-Weon},
        title = "{Multi-Temporal Scale Global Gravity Field Determination From GRACE Follow-On: Pentad Polar Regions and Monthly Low-to-Mid Latitudes}",
      journal = {Journal of Geophysical Research (Solid Earth)},
     keywords = {LGD, GRACE-FO, polar region},
         year = 2025,
        month = oct,
       volume = {130},
       number = {10},
          eid = {e2025JB031186},
        pages = {e2025JB031186},
     abstract = "{The Gravity Recovery and Climate Experiment and GRACE Follow-On (GRACE-
        FO) missions have successfully detected Earth's mass
        redistributions on a monthly basis. Recently, various groups
        have developed daily and 5-day interval ``regularized'' mass
        concentration (mascon) solutions. These solutions support mass
        variations at gridded areas focusing primarily on improved
        detection of land mass change signal. Instead of deriving
        regularized mascon solution, we present the derivation of multi-
        temporal scale but Level2-like global gravity solution using
        line-of-sight gravity difference and the Slepian function by
        exploiting increased satellite sampling at high latitude
        regions. Our spherical harmonics solution features time-varying
        gravity over the polar regions every 5-day while the low-to-mid
        latitude regions every 30-day. This allows avoiding the under-
        sampling problem without incorporating regularization, while
        also reducing the aliasing problem in the polar region. Our new
        solution strategy is tested with synthetic experiment with the
        Earth System Model. The synthetic test shows that 5-day
        solutions exhibit comparable error level to the 30-day solution
        in the polar region after the suppression of the correlation
        error. Our multi-temporal scale global gravity solutions
        successfully identify intra-month surface mass change signals
        not previously identified by usual monthly-mean gravity field
        solutions. They are associated with residual ocean tidal mass
        change, rapid snowfall accumulation in an Antarctic basin, and
        high-frequency ocean mass changes in the Arctic ocean. Our
        approach demonstrates the feasibility of generating shorter
        interval global gravity solutions without any regularization or
        loss of accuracy and opens opportunities to fully utilize GRACE-
        FO measurements with various spatial coverages.}",
          doi = {10.1029/2025JB031186},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2025JGRB..13031186L},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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