Publications related to the GRACE Missions (no abstracts)

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Annual polar motion and its variability

Wang, Songyun, Wilson, Clark R., Chen, Jianli, and Seo, Ki-Weon, 2025. Annual polar motion and its variability. Journal of Geodesy, 99(7):57, doi:10.1007/s00190-025-01982-2.

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@ARTICLE{2025JGeod..99...57W,
       author = {{Wang}, Songyun and {Wilson}, Clark R. and {Chen}, Jianli and {Seo}, Ki-Weon},
        title = "{Annual polar motion and its variability}",
      journal = {Journal of Geodesy},
     keywords = {Polar motion excitation, Earth rotation, GRACE, GRACE Follow-on, SLR, Annual amplitude modulation, Earth Sciences, Oceanography, Engineering, Geomatic Engineering},
         year = 2025,
        month = jul,
       volume = {99},
       number = {7},
          eid = {57},
        pages = {57},
     abstract = "{The annual component is the largest signal in polar motion excitation,
        with contributions from changes in mass distribution and motion
        in the atmosphere, oceans, land hydrology and cryosphere. For
        the period 2002-2023, we examine available estimates and
        combinations of various contributions to polar motion excitation
        from data-assimilating numerical models of the atmosphere,
        oceans, and land hydrology and from satellite gravity
        measurements from the Gravity Recovery and Climate Experiment
        (GRACE) \& GRACE Follow-On (GRACE-FO) and Satellite Laser
        Ranging (SLR). We compare observed annual polar motion with
        combinations of estimates using a metric that considers both
        differences in average annual behavior and differences in
        modulation of the annual component over time. Using this metric,
        we identify a preferred combination of estimates (National
        Centers for Environmental Prediction (NCEP) for the atmosphere,
        Max-Planck-Institute for Meteorology Ocean Model (MPIOM) for the
        oceans, and GRACE/GRACE-FO satellite gravity observations for
        land hydrology). Analyzing the average annual variation with its
        variability over time provides a framework to understand both
        the amplitude modulation and the distinct pro- and retrograde
        behaviors of the annual excitation. The persistently smaller
        retrograde annual excitation is primarily due to out-of-phase
        atmospheric and oceanic excitations.}",
          doi = {10.1007/s00190-025-01982-2},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2025JGeod..99...57W},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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