Geophysical Modelling Of The Polar Motion

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Geophysical Modelling of the Polar Motion

Author : Christian Bizouard
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110389134
Total Pages : 324 pages
Book Rating : 4.1/5 (13 download)

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Book Synopsis Geophysical Modelling of the Polar Motion by : Christian Bizouard

Download or read book Geophysical Modelling of the Polar Motion written by Christian Bizouard and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-10-26 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polar motion is an important geophysical process, and difficult to understand given the various parameters involved. But it is of key importance to our climate and climate change. Understanding and modeling also has implications on key technologies such as space geodesy and satellite navigation. Additionally, long term polar motion has close links to decadal climate change and ice cap development. It also reflects the global circulation in the hydro-atmospheric layers and the internal properties of the Earth. Therefore the topic is of primary interest for geophysics as well as climatology.

Geophysical Modelling of the Polar Motion

Author : Christian Bizouard
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 3110298090
Total Pages : 398 pages
Book Rating : 4.1/5 (12 download)

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Book Synopsis Geophysical Modelling of the Polar Motion by : Christian Bizouard

Download or read book Geophysical Modelling of the Polar Motion written by Christian Bizouard and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-10-26 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polar motion is an important geophysical process, and difficult to understand given the various parameters involved. But it is of key importance to our climate and climate change. Understanding and modeling also has implications on key technologies such as space geodesy and satellite navigation. Additionally, long term polar motion has close links to decadal climate change and ice cap development. It also reflects the global circulation in the hydro-atmospheric layers and the internal properties of the Earth. Therefore the topic is of primary interest for geophysics as well as climatology.

The Earth's Variable Rotation

Author : Kurt Lambeck
Publisher : Cambridge University Press
ISBN 13 : 9780521673303
Total Pages : 468 pages
Book Rating : 4.6/5 (733 download)

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Book Synopsis The Earth's Variable Rotation by : Kurt Lambeck

Download or read book The Earth's Variable Rotation written by Kurt Lambeck and published by Cambridge University Press. This book was released on 2005-06-30 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of the irregular rotation of the Earth and the geophysical mechanisms responsible for it.

The Use of Gravimetric Data from GRACE Mission in the Understanding of Polar Motion Variations

Author : Lucia Seoane
Publisher :
ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (644 download)

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Book Synopsis The Use of Gravimetric Data from GRACE Mission in the Understanding of Polar Motion Variations by : Lucia Seoane

Download or read book The Use of Gravimetric Data from GRACE Mission in the Understanding of Polar Motion Variations written by Lucia Seoane and published by . This book was released on 2009 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tesseral coefficients C21 and S21 derived from Gravity Recovery and Climate Experiment (GRACE) observations allow to compute the mass term of the polar-motion excitation function. This independent estimation can improve the geophysical models and, in addition, determine the unmodelled phenomena. In this paper, we intend to validate the polar motion excitation derived from GRACE's last release (GRACE Release 4) computed by different institutes: GeoForschungsZentrum (GFZ), Postdam, Germany; Center for Space Research (CSR), Austin, USA; Jet Propulsion Laboratory (JPL), Pasadena, USA, and the Groupe de Recherche en Géodésie Spatiale (GRGS), Toulouse, France. For this purpose, we compare these excitations functions first to the mass term obtained from observed Earth's rotation variations free of the motion term and, second, to the mass term estimated from geophysical fluids models. We confirm the large improvement of the CSR solution, and we show that the GRGS estimate is also well correlated with the geodetic observations. Significant discrepancies exist between the solutions of each centre. The source of these differences is probably related to the data processing strategy. We also consider residuals computed after removing the geophysical models or the gravimetric solutions from the geodetic mass term. We show that the residual excitation based on models is smoother than the gravimetric data, which are still noisy. Still, they are comparable for the X2 component. It appears that X2 residual signals using GFZ and JPL data have less variability. Finally, for assessing the impact of the geophysical fluids models choice on our results, we checked two different oceanic excitation series. We show the significant differences in the residuals correlations, especially for the X1 more sensitive to the oceanic signals.

Consistent Atmospheric and Oceanic Excitation of the Earth's Free Polar Motion

Author : Florian Seitz
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (554 download)

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Book Synopsis Consistent Atmospheric and Oceanic Excitation of the Earth's Free Polar Motion by : Florian Seitz

Download or read book Consistent Atmospheric and Oceanic Excitation of the Earth's Free Polar Motion written by Florian Seitz and published by . This book was released on 2004 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earth orientation parameters as observed by space-geodetic techniques show a broad spectrum of frequencies. Many efforts have been made to relate spectral peaks to geophysical processes, such as atmospheric or oceanic variations. However, the mechanisms of excitation of some typical oscillations are still unclear. In order to get insight into the rotational dynamics of the Earth, the non-linear gyroscopic Earth model DyMEG has been developed. The present paper studies the superposed effect of atmospheric and oceanic excitation on the free rotation of a viscoelastic gyro. In contrast to former investigations, period and damping of the Earth's free wobble (Chandler wobble) are generated by the gyro from geometrical and rheological parameters. Numerical results for polar motion in the time domain demonstrate that damping exists without explicit excitation but vanishes when regarding atmospheric and oceanic angular momentum. Simulated polar motion for the period from 1975 to 1994 forced by consistent atmospheric and oceanic angular momentum shows significant correlation with geodetic observations which indicates that the free gyroscopic model DyMEG is able to reproduce realistic variations of the Earth's rotation. Spectral analyses of both atmospheric and oceanic excitations give no hint for increased power in the Chandler frequency band as it was stated for the maintenance of the Chandler wobble in recent research studies. Thus, stochastic signals in the climate dynamics as caused by both the weather and oceanic mass redistributions are found to be a sufficient source to maintain the amplitude of the Earth's free wobble by resonant interaction.

Variations in Earth Rotation

Author : Dennis D. McCarthy
Publisher : American Geophysical Union
ISBN 13 : 0875904599
Total Pages : 197 pages
Book Rating : 4.8/5 (759 download)

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Book Synopsis Variations in Earth Rotation by : Dennis D. McCarthy

Download or read book Variations in Earth Rotation written by Dennis D. McCarthy and published by American Geophysical Union. This book was released on 1990 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 59. As part of the Nineteenth General Assembly of The International Union of Geodesy and Geophysics Symposium (IUGG) in Vancouver, Canada, Union Symposium U4, "Variations in Earth Rotation" was held August 18-19 1987. The Convenor was Dennis D. McCarthy, U.S. Naval Observatory with P. Paquet, Observatoire Royal de Belgique and M. G. Rochester, St. Johns University serving as co-convernors. In a session on internal structure of the Earth papers dealt with the geophysical effects on Earth rotation parameters. Mantle anelasticity increases the free core nutation (FCN) period by a few days. The period of the FCN and the amplitudes of the main nutation components are sensitive to the ellipticity of the core?]mantle boundary (CMB), and a non-hydrostatic increase of 400m in the flattening of the CMB is a possible explanation of the discrepancies from theory. An alternative suggestion rests on the subseismic description of the nutation spectrum of the stratified liquid core. Evidently new models will have to take into account contributions from the oceans, mantle anelasticity, non-hydrostatic pre-stress, CMB topography and internal core structure.

Report of the International Polar Motion Service

Author : International Polar Motion Service
Publisher :
ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (469 download)

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Book Synopsis Report of the International Polar Motion Service by : International Polar Motion Service

Download or read book Report of the International Polar Motion Service written by International Polar Motion Service and published by . This book was released on 1963 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Treatise on Geophysics, Volume 3

Author : Tom Herring
Publisher : Elsevier
ISBN 13 : 0444535799
Total Pages : 461 pages
Book Rating : 4.4/5 (445 download)

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Book Synopsis Treatise on Geophysics, Volume 3 by : Tom Herring

Download or read book Treatise on Geophysics, Volume 3 written by Tom Herring and published by Elsevier. This book was released on 2010-04-20 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geodesy, which is the science of measuring the size and shape of the Earth, explores the theory, instrumentation and results from modern geodetic systems. The beginning sections of the volume cover the theory of the Earth's gravity field, the instrumentation for measuring the field, and its temporal variations. The measurements and results obtained from variations in the rotation of the Earth are covered in the sections on short and long period rotation hanges. Space based geodetic methods, including the global positioning system (GPS) and Interferometric synthetic aperture radar (SAR), are also examined in detail. Self-contained volume starts with an overview of the subject then explores each topic with in depth detail Extensive reference lists and cross references with other volumes to facilitate further research Full-color figures and tables support the text and aid in understanding Content suited for both the expert and non-expert

Polar Motion Derived with the Results of the Time Observation

Author : S. Takagi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (127 download)

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Book Synopsis Polar Motion Derived with the Results of the Time Observation by : S. Takagi

Download or read book Polar Motion Derived with the Results of the Time Observation written by S. Takagi and published by . This book was released on 1963 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Treatise on Geophysics

Author :
Publisher : Elsevier
ISBN 13 : 0444538038
Total Pages : 5604 pages
Book Rating : 4.4/5 (445 download)

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Book Synopsis Treatise on Geophysics by :

Download or read book Treatise on Geophysics written by and published by Elsevier. This book was released on 2015-04-17 with total page 5604 pages. Available in PDF, EPUB and Kindle. Book excerpt: Treatise on Geophysics, Second Edition, is a comprehensive and in-depth study of the physics of the Earth beyond what any geophysics text has provided previously. Thoroughly revised and updated, it provides fundamental and state-of-the-art discussion of all aspects of geophysics. A highlight of the second edition is a new volume on Near Surface Geophysics that discusses the role of geophysics in the exploitation and conservation of natural resources and the assessment of degradation of natural systems by pollution. Additional features include new material in the Planets and Moon, Mantle Dynamics, Core Dynamics, Crustal and Lithosphere Dynamics, Evolution of the Earth, and Geodesy volumes. New material is also presented on the uses of Earth gravity measurements. This title is essential for professionals, researchers, professors, and advanced undergraduate and graduate students in the fields of Geophysics and Earth system science. Comprehensive and detailed coverage of all aspects of geophysics Fundamental and state-of-the-art discussions of all research topics Integration of topics into a coherent whole

Geodetic Sciences

Author : Shuanggen Jin
Publisher : BoD – Books on Demand
ISBN 13 : 9535111442
Total Pages : 358 pages
Book Rating : 4.5/5 (351 download)

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Book Synopsis Geodetic Sciences by : Shuanggen Jin

Download or read book Geodetic Sciences written by Shuanggen Jin and published by BoD – Books on Demand. This book was released on 2013-05-29 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space geodetic techniques, e.g., global navigation satellite systems (GNSS), Very Long Baseline Interferometry (VLBI), satellite gravimetry and altimetry, and GNSS Reflectometry

Seasonal Polar Motion Excitation from Numerical Models of Atmosphere, Ocean, and Continental Hydrosphere

Author : Henryk Dobslaw
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (745 download)

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Book Synopsis Seasonal Polar Motion Excitation from Numerical Models of Atmosphere, Ocean, and Continental Hydrosphere by : Henryk Dobslaw

Download or read book Seasonal Polar Motion Excitation from Numerical Models of Atmosphere, Ocean, and Continental Hydrosphere written by Henryk Dobslaw and published by . This book was released on 2010 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effective angular momentum functions from atmosphere, oceans, and terrestrial water storage are obtained from European Centre for Medium-Range Weather Forecasts atmospheric data and corresponding simulations with the Ocean Model for Circulation and Tides and the Land Surface and Discharge Model (LSDM). Mass exchanges among the subsystems are realized by means of freshwater fluxes, causing the total ocean mass to vary predominantly annually. Variations in total ocean mass affect the oceanic excitations of the annual wobble by almost 1 milliarc second (mas) for both prograde and retrograde components, whereas the motion term contributions of terrestrial water flow derived from LSDM are found to be 3 orders of magnitude smaller. Since differences to geodetic excitations are not substantially reduced and regional decompositions demonstrate the large spatial variability of contributions to seasonal polar motion excitation that compensate each other when integrated globally, it is concluded that the closure of the seasonal excitation budget is still inhibited by remaining model errors in all subsystems.

Reports on Astronomy 2003-2005 (IAU XXVIA)

Author : Oddbjorn Engvold
Publisher : Cambridge University Press
ISBN 13 : 9780521856041
Total Pages : 416 pages
Book Rating : 4.8/5 (56 download)

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Book Synopsis Reports on Astronomy 2003-2005 (IAU XXVIA) by : Oddbjorn Engvold

Download or read book Reports on Astronomy 2003-2005 (IAU XXVIA) written by Oddbjorn Engvold and published by Cambridge University Press. This book was released on 2007-05-10 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transactions XXVIA of the International Astronomical Union (IAU) provides a comprehensive and authoritative review of what has been achieved in astronomy during the years 2003 to 2005. The insightful and up-to-date reviews are written by the Presidents and Chairpersons of the IAU's different Divisions, Commissions and Working Groups and each focuses on a different subject area. Topics covered in this wide-ranging volume include: fundamental astronomy; the Sun and heliosphere; planetary systems sciences; stars; variable stars; interstellar matter; the Galactic system; galaxies and the Universe; optical and infrared techniques; radio astronomy; space and high energy astrophysics; and other IAU activities. The reviews are written at a level suitable for colleagues in the same field, but they will also be useful for students and researchers wishing to gain an overview beyond their own research area.

IAG 150 Years

Author : Chris Rizos
Publisher : Springer
ISBN 13 : 3319308955
Total Pages : 751 pages
Book Rating : 4.3/5 (193 download)

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Book Synopsis IAG 150 Years by : Chris Rizos

Download or read book IAG 150 Years written by Chris Rizos and published by Springer. This book was released on 2016-08-08 with total page 751 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings contains a selection of peer-reviewed papers presented at the IAG Scientific Assembly, Postdam, Germany, 1-6 September, 2013. The scientific sessions were focussed on the definition, implementation and scientific applications of reference frames; gravity field determination and applications; the observation and assessment of earth hazards. It presents a collection of the contributions on the applications of earth rotations dynamics, on observation systems and services as well as on imaging and positioning techniques and its applications.

Polar Motion

Author : Steven J. Dick
Publisher :
ISBN 13 :
Total Pages : 696 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Polar Motion by : Steven J. Dick

Download or read book Polar Motion written by Steven J. Dick and published by . This book was released on 2000 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Contains 64 papers September 1999 colloquium The historical sessions review the history of early polar motion research and the International Latitude Service. The scientific sessions discuss observational techniques for polar motion, long-term polar motion, Chandler and annual polar motion, daily and subdaily polar motion, and modern definition of the Celestial Ephemeris Pole. Topics include time and polar motion in early NASA spacecraft navigation, secular variation of Carloforte latitude, and comparison of the short period rigid earth nutation series. Annotation c. Book News, Inc., Portland, OR (booknews.com)

Geodesy for Planet Earth

Author : Steve Kenyon
Publisher : Springer Science & Business Media
ISBN 13 : 3642203388
Total Pages : 992 pages
Book Rating : 4.6/5 (422 download)

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Book Synopsis Geodesy for Planet Earth by : Steve Kenyon

Download or read book Geodesy for Planet Earth written by Steve Kenyon and published by Springer Science & Business Media. This book was released on 2012-01-26 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings include the written version of 130 papers presented at the International Association of Geodesy IAG2009 "Geodesy for Planet Earth" Scientific Assembly. It was held 31 August to 4 September 2009 in Buenos Aires, Argentina. The theme "Geodesy for Planet Earth" was selected to follow the International Year of Planet Earth 2007-2009 goals of utilizing the knowledge of the world’s geoscientists to improve society for current and future generations. The International Year started in January 2007 and ran thru 2009 which coincided with the IAG2009 Scientific Assembly, one of the largest and most significant meetings of the Geodesy community held every 4 years. The IAG2009 Scientific Assembly was organized into eight Sessions. Four of the Sessions of IAG2009 were based on the IAG Structure (i.e. one per Commission) and covered Reference Frames, Gravity Field, Earth Rotation and Geodynamics, and Positioning and Applications. Since IAG2009 was taking place in the great Argentine city of Buenos Aires, a Session was devoted to the Geodesy of Latin America. A Session dedicated to the IAG’s Global Geodetic Observing System (GGOS), the primary observing system focused on the multidisciplinary research being done in Geodesy that contributes to important societal issues such as monitoring global climate change and the environment. A Session on the IAG Services was also part of the Assembly detailing the important role they play in providing geodetic data, products, and analysis to the scientific community. A final Session devoted to the organizations ION, FIG, and ISPRS and their significant work in navigation and earth observation that complements the IAG.

Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition

Author :
Publisher : ScholarlyEditions
ISBN 13 : 146496338X
Total Pages : 6804 pages
Book Rating : 4.4/5 (649 download)

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Book Synopsis Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition by :

Download or read book Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 6804 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Earth Sciences, Geology, and Geophysics. The editors have built Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Earth Sciences, Geology, and Geophysics in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.