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Area of Science:

  • Geophysics
  • Oceanography
  • Earth System Science

Background:

  • Earth's rotation exhibits non-tidal variations influenced by mass redistribution.
  • Oceanic Angular Momentum (OAM) is a key factor in these variations, particularly at decadal timescales.
  • Accurate OAM modeling is crucial for understanding Earth rotation dynamics.

Purpose of the Study:

  • To assess and improve the modeling of oceanic contributions to Earth's rapid, non-tidal rotation variations.
  • To evaluate the accuracy of different ocean circulation models in representing OAM.
  • To identify limitations in current ocean models for geodetic applications.

Main Methods:

  • Analysis of Oceanic Angular Momentum (OAM) estimates from multiple circulation models (2007-2011).
  • Comparison of model outputs with geodetic data, including polar motion and length-of-day.
  • Statistical analysis of Gravity Recovery and Climate Experiment (GRACE) data to validate ocean model dynamics.
  • Investigation of model resolution effects on OAM estimation, particularly in the Southern Ocean.

Main Results:

  • One OAM product was found to have spurious short-period variance, making it unsuitable for timescales under 2 weeks.
  • Incorporating OAM from most models reduced the variance in atmosphere-corrected geodetic excitation by 54% (polar motion) and 60% (length-of-day).
  • A specific high-resolution model (1/4 degree grid) improved OAM estimates, with the combined ocean-atmosphere effect explaining up to 84% of polar motion excitation.

Conclusions:

  • Higher ocean model resolution is essential for accurate OAM estimation and geodetic applications.
  • Current coarse-resolution models (1 degree) may misrepresent Southern Ocean dynamics, impacting OAM accuracy.
  • Improved OAM modeling is critical for advancing Earth system science and understanding Earth rotation variations.