Publications related to the GRACE Missions (no abstracts)

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Temporal variations of geoid heights over Kazakhstan from GRACE-FO data and their relation with hydrological changes in the Caspian Sea and seismic activity

Shoganbekova, Daniya, Urazaliyev, Asset, Godah, Walyeldeen, Nurakynov, Serik, Zhaksygul, Nailya, and Kozhakhmetov, Magzhan, 2025. Temporal variations of geoid heights over Kazakhstan from GRACE-FO data and their relation with hydrological changes in the Caspian Sea and seismic activity. Frontiers in Earth Science, 13:1662855, doi:10.3389/feart.2025.1662855.

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@ARTICLE{2025FrEaS..1362855S,
       author = {{Shoganbekova}, Daniya and {Urazaliyev}, Asset and {Godah}, Walyeldeen and {Nurakynov}, Serik and {Zhaksygul}, Nailya and {Kozhakhmetov}, Magzhan},
        title = "{Temporal variations of geoid heights over Kazakhstan from GRACE-FO data and their relation with hydrological changes in the Caspian Sea and seismic activity}",
      journal = {Frontiers in Earth Science},
     keywords = {geoid height, GRACE─FO, seasonal variations, long─term variations, seismic activity, extreme hydrological events},
         year = 2025,
        month = nov,
       volume = {13},
          eid = {1662855},
        pages = {1662855},
     abstract = "{We quantify temporal variations of geoid heights
        ({\ensuremath{\Delta}}N) across Kazakhstan during 2019─2024
        using satellite gravimetry, and relate these changes to recent
        extreme hydrological and seismic events. Monthly
        {\ensuremath{\Delta}}N fields were derived from GRACE-FO─based
        global geopotential models. We applied seasonal-trend
        decomposition to isolate seasonal and long-term components,
        mapped linear trends, and assessed 2024 mass-change anomalies.
        Consistency checks included correlations with Caspian Sea water-
        level records and a preliminary comparison between
        {\ensuremath{\Delta}}N and ellipsoidal height changes from five
        continuous GPS stations within the study area.
        {\ensuremath{\Delta}}N exhibits a clear seasonal cycle with
        amplitudes up to {\ensuremath{\sim}}3.5 mm. A persistent decline
        in geoid heights during 2019─2022 is observed along the Caspian
        Sea coast, reaching rates of up to {\ensuremath{-}}1.57 mm
        yr$^{{\ensuremath{-}}1}$. In 2024, mass anomalies associated
        with seismic and hydrological events interrupted this decline.
        {\ensuremath{\Delta}}N correlates strongly with Caspian Sea
        level variations (r = 0.91). GPS─GRACE-FO comparisons show an
        inverse seasonal pattern, consistent with mass-loading effects.
        GRACE-FO robustly captures regional, mass-related geoid
        variability over Kazakhstan. The results support applications in
        geodetic infrastructure maintenance, hazard assessment and early
        warning, and climate-impact analysis. They also provide inputs
        relevant to the realization of the International Height
        Reference Frame by accounting for time-variable gravity in
        Central Asia.}",
          doi = {10.3389/feart.2025.1662855},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2025FrEaS..1362855S},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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