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Nastula, Jolanta and Sliwinska, Justyna, 2020. Prograde and Retrograde Terms of Gravimetric Polar Motion Excitation Estimates from the GRACE Monthly Gravity Field Models. Remote Sensing, 12(1):138, doi:10.3390/rs12010138.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2020RemS...12..138N,
author = {{Nastula}, Jolanta and {{\'S}liwi{\'n}ska}, Justyna},
title = "{Prograde and Retrograde Terms of Gravimetric Polar Motion Excitation Estimates from the GRACE Monthly Gravity Field Models}",
journal = {Remote Sensing},
keywords = {GRACE, Earth rotation, polar motion excitation, complex Fourier transform},
year = 2020,
month = jan,
volume = {12},
number = {1},
eid = {138},
pages = {138},
abstract = "{From 2002 to 2017, the Gravity Recovery and Climate Experiment (GRACE)
mission's twin satellites measured variations in the mass
redistribution of Earth's superficial fluids, which disturb
polar motion (PM). In this study, the PM excitation estimates
were computed from two recent releases of GRACE monthly gravity
field models, RL05 and RL06, and converted into prograde and
retrograde circular terms by applying the complex Fourier
transform. This is the first such analysis of circular parts in
GRACE-based excitations. The obtained series were validated by
comparison with the residuals of observed polar motion
excitation (geodetic angular momentum (GAM)-atmospheric angular
momentum (AAM)-oceanic angular momentum (OAM) (GAO)) determined
from precise geodetic measurements of the pole coordinates. We
examined temporal variations of hydrological excitation function
series (or hydrological angular momentum, HAM) in four spectral
bands: seasonal, non-seasonal, non-seasonal short-term, and non-
seasonal long-term. The general conclusions arising from the
conducted analyses of prograde and retrograde terms were
consistent with the findings from the equatorial components of
PM excitation studies drawn in previous research. In particular,
we showed that the new GRACE RL06 data increased the consistency
between different solutions and improved the agreement between
GRACE-based excitation series and reference data. The level of
agreement between HAM and GAO was dependent on the oscillation
considered and was higher for long-term than short-term
variations. For most of the oscillations considered, the highest
agreement with GAO was obtained for CSR RL06 and ITSG-Grace2018
solutions. This study revealed that both prograde and retrograde
circular terms of PM excitation can be determined by GRACE with
similar levels of accuracy. The findings from this study may
help in choosing the most appropriate GRACE solution for PM
investigations and can be useful in future improvements to GRACE
data processing.}",
doi = {10.3390/rs12010138},
adsurl = {https://ui.adsabs.harvard.edu/abs/2020RemS...12..138N},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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