Thu Apr 10, F. Flechtner
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Harker, Alexander A., Schindelegger, Michael, Ponte, Rui M., and Salstein, David A., 2021. Modeling ocean-induced rapid Earth rotation variations: an update. Journal of Geodesy, 95(9):110, doi:10.1007/s00190-021-01555-z.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2021JGeod..95..110H,
author = {{Harker}, Alexander A. and {Schindelegger}, Michael and {Ponte}, Rui M. and {Salstein}, David A.},
title = "{Modeling ocean-induced rapid Earth rotation variations: an update}",
journal = {Journal of Geodesy},
keywords = {Earth rotation, Geophysical fluids, Excitation, Ocean bottom pressure},
year = 2021,
month = sep,
volume = {95},
number = {9},
eid = {110},
pages = {110},
abstract = "{We revisit the problem of modeling the ocean's contribution to rapid,
non-tidal Earth rotation variations at periods of 2-120 days.
Estimates of oceanic angular momentum (OAM, 2007-2011) are drawn
from a suite of established circulation models and new numerical
simulations, whose finest configuration is on a
{\ensuremath{\circ}} grid. We show that the OAM product by the
Earth System Modeling Group at GeoForschungsZentrum Potsdam has
spurious short period variance in its equatorial motion terms,
rendering the series a poor choice for describing oceanic
signals in polar motion on time scales of less than
{\ensuremath{\sim}}2 weeks. Accounting for OAM in rotation
budgets from other models typically reduces the variance of
atmosphere-corrected geodetic excitation by
{\ensuremath{\sim}}54\% for deconvolved polar motion and by
{\ensuremath{\sim}}60\% for length-of-day. Use of OAM from the
{\ensuremath{\circ}} model does provide for an additional
reduction in residual variance such that the combined oceanic-
atmospheric effect explains as much as 84\% of the polar motion
excitation at periods < 120 days. Employing statistical analysis
and bottom pressure changes from daily Gravity Recovery and
Climate Experiment solutions, we highlight the tendency of ocean
models run at a 1{\ensuremath{\circ}} grid spacing to
misrepresent topographically constrained dynamics in some deep
basins of the Southern Ocean, which has adverse effects on OAM
estimates taken along the 90{\ensuremath{\circ}} meridian.
Higher model resolution thus emerges as a sensible target for
improving the oceanic component in broader efforts of Earth
system modeling for geodetic purposes.}",
doi = {10.1007/s00190-021-01555-z},
adsurl = {https://ui.adsabs.harvard.edu/abs/2021JGeod..95..110H},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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