Mon Oct 13, F. Flechtner
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Winska, Ma&lstrokgorzata, 2021. A Comparative Study of Interannual Oscillation Models for Determining Geophysical Polar Motion Excitations. Remote Sensing, 14(1):147, doi:10.3390/rs14010147.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2021RemS...14..147W,
author = {{Wi{\'n}ska}, Ma{\l}gorzata},
title = "{A Comparative Study of Interannual Oscillation Models for Determining Geophysical Polar Motion Excitations}",
journal = {Remote Sensing},
keywords = {polar motion excitation, interannual oscillations, geophysical models},
year = 2021,
month = dec,
volume = {14},
number = {1},
eid = {147},
pages = {147},
abstract = "{Similar to seasonal and intraseasonal variations in polar motion (PM),
interannual variations are also largely caused by changes in the
angular momentum of the Earth's geophysical fluid layers
composed of the atmosphere, the oceans, and in-land hydrologic
flows (AOH). Not only are inland freshwater systems crucial for
interannual PM fluctuations, but so are atmospheric surface
pressures and winds, oceanic currents, and ocean bottom
pressures. However, the relationship between observed geodetic
PM excitations and hydro-atmospheric models has not yet been
determined. This is due to defects in geophysical models and the
partial knowledge of atmosphere-ocean coupling and hydrological
processes. Therefore, this study provides an analysis of the
fluctuations of PM excitations for equatorial geophysical
components {\ensuremath{\chi}}$_{1}$ and
{\ensuremath{\chi}}$_{2}$ at interannual time scales. The
geophysical excitations were determined from different sources,
including atmospheric, ocean models, Gravity Recovery and
Climate Experiment (GRACE) and GRACE Follow-On data, as well as
from the Land Surface Discharge Model. The Multi Singular
Spectrum Analysis method was applied to retain interannual
variations in {\ensuremath{\chi}}$_{1}$ and
{\ensuremath{\chi}}$_{2}$ components. None of the considered
mass and motion terms studied for the different atmospheric and
ocean models were found to have a negligible effect on
interannual PM. These variables, derived from different
Atmospheric Angular Momentum (AAM) and Oceanic Angular Momentum
(OAM) models, differ from each other. Adding hydrologic
considerations to the coupling of AAM and OAM excitations was
found to provide benefits for achieving more consistent
interannual geodetic budgets, but none of the AOH combinations
fully explained the total observed PM excitations.}",
doi = {10.3390/rs14010147},
adsurl = {https://ui.adsabs.harvard.edu/abs/2021RemS...14..147W},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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Mon Oct 13, F. Flechtner