The IERS EOP 14C04 solution for Earth orientation parameters consistent with ITRF 2014

Bizouard, Christian; Lambert, S.; Gattano, C.; Becker, O.; Richard, Jean-Yves

doi:10.1007/s00190-018-1186-3

Cited by 194 publications

(124 citation statements)

References 35 publications

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“…Ocean loading effects FES2012 [29] Earth orientation modelling IERS Conventions 2010 [30] Earth orientation parameters EOP C04 [31] Phase windup Models used by Kouba [28] Estimated Parameters Troposphere 1 ZTD/2 h, 1 pair of gradients (E, N)/day (1 couple of gradients in north and east direction are also adjusted per day following [31,32] Observation sampling 300 s…”

Section: Ionosphere Modelmentioning

confidence: 99%

PPP and PPP-AR Kinematic Post-Processed Performance of GPS-Only, Galileo-Only and Multi-GNSS

2019

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Section: Ionosphere Modelmentioning

confidence: 99%

PPP and PPP-AR Kinematic Post-Processed Performance of GPS-Only, Galileo-Only and Multi-GNSS

2019

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“…The data sets used in this study are the 14C01 (sampled at 0.05-yr) and daily 14C04 series (Bizouard et al, 2018) starting in 1846 and 1962, respectively. The accuracy of the data has drastically improved from several tens of milliarc second (mas; 1 mas is equivalent to 30 cm at the surface of the Earth) during the optical era to less than 0.1 mas after the 1990s.…”

Section: Polar Motionmentioning

confidence: 92%

“…The accuracy of the data has drastically improved from several tens of milliarc second (mas; 1 mas is equivalent to 30 cm at the surface of the Earth) during the optical era to less than 0.1 mas after the 1990s. The data sets used in this study are the 14C01 (sampled at 0.05-yr) and daily 14C04 series (Bizouard et al, 2018) starting in 1846 and 1962, respectively. They are made available by the International Earth Rotation and Reference System Service Earth Orientation Center (Paris Observatory; http://iers.obspm.fr/eop-pc) and provide coordinates of observed rotation pole with respect to the conventional pole of the international terrestrial reference frame (Altamimi et al, 2016).…”

Section: Polar Motionmentioning

confidence: 99%

Is There an Influence of the Pole Tide on Volcanism? Insights From Mount Etna Recent Activity

Lambert

Sottili

2019

Geophysical Research Letters

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We investigate a possible link between polar motion and (i) seismic energy release and (ii) timing and intensity of eruptions at Mount Etna (Italy) for which a dense observational database is available. Our study suggests that the seismicity around Mount Etna increases during the largest excursions of the Earth rotation pole, which result from the constructive interference of the climate-driven seasonal and Chandler wobbles. To a lesser extent, a similar link is detected between the pole tide and the erupted volume of magma. We infer that, by creating periodic changes in the state of stress in the crust through a variable centrifugal force and a periodic vertical displacement (pole tide), variations in polar motion influence eruption timing and magnitude and the rate of seismic energy release from volcanoes. This study provides new evidences on the sensitivity of volcanoes to external forcing. Plain Language SummaryThe Earth surface is continuously deformed by a wide range of phenomena including lunisolar tides and centrifugal forces due to changes in the Earth's rotation rate and in the direction of its rotation axis. The latter class of deformations is typically of a centimeter on interannual timescales. On another side, some volcanoes appear to be sensitive to small perturbations of the crustal stress. We detected similar variability in the centrifugal forces arising from the Earth's rotation axis direction variability and Mount Etna seismicity and erupted magma volume. This suggests that the variation of the Earth's rotation axis direction plays a significant role as modulator of the activity of Mount Etna.

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“…There are quite a few observational results for the CW and FCN, by analyzing different kinds of data sets, including Earth orientation parameter (EOP) data (Bizouard & Gambis, 2009;Bizouard et al, 2019), very long baseline interferometry (VLBI) data, superconducting gravity (SG) data, and others. The period and quality factor of CW are often determined using polar motion data in EOP data set, SG data (Ding & Chao, 2017), and polar motion excitation data (Furuya & Chao, 1996;Nastula & Gross, 2015).…”

Section: Observed and Predicted Rotational Normal Mode Valuesmentioning

confidence: 99%

Formulation of a Triaxial Three‐Layered Earth Rotation: Theory and Rotational Normal Mode Solutions

Guo

Shen

2020

JGR Solid Earth

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In this study, we formulated a triaxial three‐layered anelastic Earth rotation theory considering various core‐mantle couplings, including the pressure and gravitational couplings acting on the elastic inner core by the outer core and mantle, and the viscoelectromagnetic couplings between the outer core and mantle and between the outer and inner cores. With this formulation, using the eigenvalue method, we solved four rotational normal modes, including the Chandler Wobble (CW), Free Core Nutation (FCN), Free Inner Core Nutation (FICN), and the Inner Core Wobble (ICW). The triaxiality of the actual Earth has notable effects on rotational normal modes, that is, 0.005, 0.0, −0.071, and 1.174 d (mean solar days), respectively, for the CW, FCN, FICN, and ICW. In the case that the triaxiality is bigger, for instance, if the Earth's equatorial dynamical ellipticity were 5.22×10−4, which is 1 order of magnitude larger than the presently determined ellipticity ( 2.2×10−5), the CW and ICW periods will be lengthened by 3.579 and 94.912 d, and the FICN period will be decreased by 0.591 d. Based on our present knowledge, the numerical solutions of the four normal modes under the new rotation frame suggest that the periods of CW, FCN, FICN, and ICW are, respectively, 432.2, 429.9, 934.0, and 2,718.7 d. Our theory for Earth can be extended to other planets in our solar system.

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The IERS EOP 14C04 solution for Earth orientation parameters consistent with ITRF 2014

Cited by 194 publications

References 35 publications

PPP and PPP-AR Kinematic Post-Processed Performance of GPS-Only, Galileo-Only and Multi-GNSS

PPP and PPP-AR Kinematic Post-Processed Performance of GPS-Only, Galileo-Only and Multi-GNSS

Is There an Influence of the Pole Tide on Volcanism? Insights From Mount Etna Recent Activity

Formulation of a Triaxial Three‐Layered Earth Rotation: Theory and Rotational Normal Mode Solutions

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