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Transformation of amplitudes and frequencies of precession and nutation of the earth’s rotation vector to amplitudes and frequencies of diurnal polar motion / Bernd Richter in Journal of geodesy, vol 84 n° 1 (January 2010)
[article]
Titre : Transformation of amplitudes and frequencies of precession and nutation of the earth’s rotation vector to amplitudes and frequencies of diurnal polar motion Type de document : Article/Communication Auteurs : Bernd Richter, Auteur ; J. Engels, Auteur ; Erik W. Grafarend, Auteur Année de publication : 2010 Article en page(s) : pp 1 - 18 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] équation différentielle
[Termes IGN] mouvement du pôle
[Termes IGN] nutation
[Termes IGN] précession
[Termes IGN] rotation de la TerreRésumé : (Auteur) The temporal change of the rotation vector of a rotating body is, in the first order, identical in a space-fixed system and in a body-fixed system. Therefore, if the motion of the rotation axis of the earth relative to a space-fixed system is given as a function of time, it should be possible to compute its motion relative to an earth-fixed system, and vice versa. This paper presents such a transformation. Two models of motion of the rotation axis in the space-fixed system are considered: one consisting only of a regular (i.e., strictly conical) precession and one extended by circular nutation components, which are superimposed upon the regular precession. The Euler angles describing the orientation of the earth-fixed system with respect to the space-fixed system are derived by an analytical solution of the kinematical Eulerian differential equations. In the first case (precession only), this is directly possible, and in the second case (precession and nutation), a solution is achieved by a perturbation approach, where the result of the first case serves as an approximation and nutation is regarded as a small perturbation, which is treated in a linearized form. The transformation by means of these Euler angles shows that the rotation axis performs in the earth-fixed system retrograde conical revolutions with small amplitudes, namely one revolution with a period of one sidereal day corresponding to precession and one revolution with a period which is slightly smaller or larger than one sidereal day corresponding to each (prograde or retrograde) circular nutation component. The peculiar feature of the derivation presented here is the analytical solution of the Eulerian differential equations. Copyright Springer Numéro de notice : A2010-032 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0339-9 Date de publication en ligne : 16/09/2009 En ligne : https://doi.org/10.1007/s00190-009-0339-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30228
in Journal of geodesy > vol 84 n° 1 (January 2010) . - pp 1 - 18[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010011 SL Revue Centre de documentation Revues en salle Disponible An improved empirical model for the effect of long-period ocean tides on polar motion / Richard S. Gross in Journal of geodesy, vol 83 n° 7 (July 2009)
[article]
Titre : An improved empirical model for the effect of long-period ocean tides on polar motion Type de document : Article/Communication Auteurs : Richard S. Gross, Auteur Année de publication : 2009 Article en page(s) : pp 635 - 644 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse diachronique
[Termes IGN] axe de rotation de la Terre
[Termes IGN] marée océanique
[Termes IGN] modèle dynamique
[Termes IGN] moment cinétique atmosphérique
[Termes IGN] moment cinétique océanique
[Termes IGN] mouvement du pôleRésumé : (Auteur) Because the tide-raising potential is symmetric about the Earth’s polar axis it can excite polar motion only by acting upon non-axisymmetric features of the Earth like the oceans. In fact, after removing atmospheric and non-tidal oceanic effects, polar motion excitation observations show a strong fortnightly tidal signal that is not completely explained by existing dynamical and empirical ocean tide models. So a new empirical model for the effect of the termensual (Mtm and mtm), fortnightly (Mf and mf), and monthly (Mm) tides on polar motion is derived here by fitting periodic terms at these tidal frequencies to polar motion excitation observations that span 2 January 1980 to 8 September 2006 and from which atmospheric and non-tidal oceanic effects have been removed. While this new empirical tide model can fully explain the observed fortnightly polar motion excitation signal during this time interval it would still be desirable to have a model for the effect of long-period ocean tides on polar motion that is determined from a dynamical ocean tide model and that is therefore independent of polar motion observations. Copyright Springer Numéro de notice : A2009-303 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0277-y Date de publication en ligne : 28/10/2008 En ligne : https://doi.org/10.1007/s00190-008-0277-y Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29933
in Journal of geodesy > vol 83 n° 7 (July 2009) . - pp 635 - 644[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-09061 SL Revue Centre de documentation Revues en salle Disponible Physically consistent system model for the study of the Earth's rotation, surface deformation and gravity field parameters / A. Hense (2009)
Titre : Physically consistent system model for the study of the Earth's rotation, surface deformation and gravity field parameters : scientific results of the DFG project Type de document : Monographie Auteurs : A. Hense, Auteur ; J. Sündermann, Auteur ; Hermann Drewes, Auteur ; et al., Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2009 Collection : DGK - B Sous-collection : Angewandte Geodäsie num. 317 Importance : 53 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8596-1 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] circulation atmosphérique
[Termes IGN] circulation océanique
[Termes IGN] déformation de la croute terrestre
[Termes IGN] modèle hydrographique
[Termes IGN] modèle physique
[Termes IGN] pesanteur terrestre
[Termes IGN] rotation de la Terre
[Termes IGN] surcharge océanique
[Termes IGN] terme de ChandlerIndex. décimale : 30.40 Géodésie physique Résumé : (Auteur) [introduction] This report is the final report of a serie of projects which studied the Earth's rotational parameters angular momentum, tensor of inertia as well as related variables of the Earth's gravitational field. A system view has been taken by trying to incorporate the contributions from the various subsystems of the Earth system in a physically consistent way. This introduction will highlight the project history and performance since 1996 and the state of the art in 2000. Note de contenu : 1. Introduction
1.1 The projects
1.2 Historical overview and motivations
2. Models of subsystems
2.1 Atmosphere models ECHAM
2.1.1 ECHAM5
2.1.2 Stand-alone atmosphere 20th century simulation
2.1.3 Results
2.2 Ocean model OMCT
2.3 Hydrological Discharge Model HDM
2.3.1 Continental hydrology modelling
2.3.1.1 SLS model component
2.3.1.2 HDM model component
2.3.1.3 Atmospheric forcing data
2.3.2 Results
2.3.2.1 Implementation of a 3-D relief model
2.3.2.2 Calculation of gravity field coefficients
2.3.2.3 Test simulations and validation of continental discharge with ECHAM4 and NCEP
2.3.2.4 Verification of simulated continental runoff (control runs)
2.3.2.5 Interface adaptation and verification of mass conservation at the boundaries in the coupled model system
2.3.2.6 Validation and analysis of continental water mass transports of ECOCTH
2.3.2.7 Statistical analysis and validation of simulated gravity field variations
2.3.2.8 Global water balance
2.3.3 Summary
3. Models of the coupled system
3.1 Coupled atmosphere-hydrosphere model ECOCTH
3.1.1 Model description
3.1.2 Validation
3.1.2.1 The lunisolar ocean tides
3.1.2.2 Global ocean circulation
3.1.2.3 Tropical variability and global warming
3.1.3 Results
3.1.3.1 Inter-annual variations and secular trends in length of day
3.2 Dynamic model of Earth rotation, gravity and surface deformation DyMEG
3.2.1 Numerical solution of the Liouville differential equation
3.2.2 Inverse model for surface deformations of the solid Earth due to mass loads
4. Results for Earth rotation, surface deformation and gravity
4.1 Validation of DyMEG with NCEP and ECCO
4.2 Results of DyMEG with ECOCTH forcing
5. Scientific highlights
5.1 Tidal mixing
5.1.1 Tidal mixing in OMCT2
5.1.2 Effect of tidal mixing on ocean water mass properties
5.2 Secular and decadal variations
5.2.1 Coupled simulation of Earth Rotation Parameters
5.2.2 Axial AAM long-term trends in 21st century scenario runs
5.3 Forcing mechanisms of the Chandler oscillation
5.3.1 Atmospheric and hydrospheric excitation of the Chandler oscillation
5.3.2 Noise as excitation mechanism of the Chandler oscillation
6. Conclusions and outlook
7. ReferencesNuméro de notice : 15454 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62723 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15454-01 30.40 Livre Centre de documentation Géodésie Disponible Polar motion modeling, analysis, and prediction with time dependent harmonic coefficients / Huseyin Baki Iz in Journal of geodesy, vol 82 n° 12 (December 2008)
[article]
Titre : Polar motion modeling, analysis, and prediction with time dependent harmonic coefficients Type de document : Article/Communication Auteurs : Huseyin Baki Iz, Auteur Année de publication : 2008 Article en page(s) : pp 871 - 881 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] modèle de simulation
[Termes IGN] mouvement du pôle
[Termes IGN] série temporelle
[Termes IGN] terme de ChandlerRésumé : (Auteur) A time dependent amplitude model was proposed for the analysis and prediction of polar motion time series. The formulation was implemented to analyze part of the new combined solution, EOP (IERS) C 04, daily polar motion time series of 14 years length using a statistical model with first order autoregressive disturbances. A new solution approach, where the serial correlations of the disturbances are eliminated by sequentially differencing the measurements, was used to estimate the model parameters using weighted least squares. The new model parsimoniously represents the 14-year time series with 0.5 mas rms fit, close to the reported 0.1 mas observed pole position precisions for the x and y components. The model can also predict 6 months into the future with less than 4 mas rms prediction error for both polar motion components, and down to sub mas for one-step ahead prediction as validated using a set of daily time series data that are not used in the estimation. Copyright Springer Numéro de notice : A2008-471 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0215-z En ligne : https://doi.org/10.1007/s00190-008-0215-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29540
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Code-barres Cote Support Localisation Section Disponibilité 266-08111 RAB Revue Centre de documentation En réserve L003 Disponible 266-08112 RAB Revue Centre de documentation En réserve L003 Disponible The impact of errors in polar motion and nutation on UT1 determinations from VLBI Intensive observations / Axel Nothnagel in Journal of geodesy, vol 82 n° 12 (December 2008)
[article]
Titre : The impact of errors in polar motion and nutation on UT1 determinations from VLBI Intensive observations Type de document : Article/Communication Auteurs : Axel Nothnagel, Auteur ; D. Schnell, Auteur Année de publication : 2008 Article en page(s) : pp 863 - 869 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] compensation
[Termes IGN] données ITGB
[Termes IGN] écart type
[Termes IGN] erreur systématique
[Termes IGN] mouvement du pôle
[Termes IGN] nutation
[Termes IGN] temps universelRésumé : (Auteur) The earth’s phase of rotation, expressed as Universal Time UT1, is the most variable component of the earth’s rotation. Continuous monitoring of this quantity is realised through daily single-baseline VLBI observations which are interleaved with VLBI network observations. The accuracy of these single-baseline observations is established mainly through statistically determined standard deviations of the adjustment process although the results of these measurements are prone to systematic errors. The two major effects are caused by inaccuracies in the polar motion and nutation angles introduced as a priori values which propagate into the UT1 results. In this paper, we analyse the transfer of these components into UT1 depending on the two VLBI baselines being used for short duration UT1 monitoring. We develop transfer functions of the errors in polar motion and nutation into the UT1 estimates. Maximum values reach 30 [?s per milliarcsecond] which is quite large considering that observations of nutation offsets w.r.t. the state-of-the-art nutation model show deviations of as much as one milliarcsecond. Copyright Springer Numéro de notice : A2008-470 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0212-2 En ligne : https://doi.org/10.1007/s00190-008-0212-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29539
in Journal of geodesy > vol 82 n° 12 (December 2008) . - pp 863 - 869[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08111 RAB Revue Centre de documentation En réserve L003 Disponible 266-08112 RAB Revue Centre de documentation En réserve L003 Disponible Rotational bulge and one plume convection pattern: Influence on Martian true polar wander [short paper] / Hélène Rouby in Earth and planetary science letters, vol 272 n° 1-2 (30 July 2008)PermalinkCombined Earth orientation parameters based on homogeneous and continuous VLBI and GPS data / Daniela Thaller in Journal of geodesy, vol 81 n° 6-8 (June - August 2007)PermalinkDORIS contribution to ITRF2005 / Zuheir Altamimi in Journal of geodesy, vol 80 n° 8-11 (November 2006)PermalinkJournées 2005, systèmes de référence spatio-temporels, Warsaw, 19-21 September 2005 / Alexander Brzezinski (2006)PermalinkRésolution numérique des équations des déformations de la Terre / Paul Rebischung (2005)PermalinkAtmosphärische und ozeanische Einflüsse auf die Rotation der Erde - Nummerische Untersuchungen mit einem dynamischen Erdsystemmodell / Florian Seitz (2004)PermalinkProceedings of the IERS Workshop on Combination Research and Global Geophysical Fluids, Bavarian Academy of Sciences, Munich, Germany, 18 - 21 November 2002 / Bernd Richter (2003)PermalinkAnalyse en séries temporelles de variables relatives au mouvement du pôle et à la rotation de la Terre / A.C. Chapsal (2001)PermalinkCombinations of Earth orientation measurements / Richard S. Gross (2000)PermalinkPermalinkApport de l'analyse non linéaire à l'étude géophysique de la rotation de la Terre / V. Frede (1999)PermalinkClimatic impact of glacial cycle polar motion: Coupled oscillations of ice sheet mass and rotation pole position / Bruce G. Bills in Journal of geophysical research : Solid Earth, vol 104 n° 1 (01/01/1999)PermalinkMonitoring geocenter and scale variations using Doris data: monthly and weekly comparisons toward ITRF references / Pascal Willis (1999)PermalinkLa rotation de la Terre / R. Abarca Del Rio (1997)PermalinkPolar motion derived from DORIS technique / Pascal Willis (12/05/1995)PermalinkContributions of Doris to the IERS : overview of existing solutions / Claude Boucher (21/03/1994)PermalinkContributions of space geodesy to geodynamics / D.E. Smith (1993)PermalinkVariations of short periodical oscillations of polar motion with periods ranging from 10-140 days / B. Kolaczek (1992)PermalinkFinal report of the IUGG-IAG special study group 5-98, atmospheric excitation of the Earth's rotation / J.O. Dickey (1991)PermalinkSpecial study group 5-98 / J.O. Dickey (1991)Permalink