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Consistent Atmospheric And Oceanic Excitation Of The Earths Free Polar Motion
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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.
Book Synopsis Precession, Nutation and Wobble of the Earth by : V. Dehant
Download or read book Precession, Nutation and Wobble of the Earth written by V. Dehant and published by Cambridge University Press. This book was released on 2015-04-16 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes how changes in the Earth's orientation are observed and computed in terms of tidal forcing and models of the Earth's interior.
Book Synopsis Atmospheric Excitation of Polar Motion by : John William Kuehne
Download or read book Atmospheric Excitation of Polar Motion written by John William Kuehne and published by . This book was released on 1996 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of nonseasonal polar motion excitation and atmospheric mass equatorial angular momentum (EAM) over land for the period 1980-1993 reveals a clear pattern of high power and correlation during the northern hemisphere (NH) winter followed by low power and correlation during the NH summer. During the southern hemisphere winter there is significant correlation between the atmospheric EAM over midlatitude southern oceans and polar motion excitation indicating the existence of a dynamic atmosphere-ocean excitation. The atmospheric excitation power is too small to explain the large correlation during the NH winter. The momentum of wind probably accounts for the deficit in power. The implication of these results is that there are two main excitation sources each dominant at different seasons. Atmospheric mass redistribution over land forces polar motion during the NH winter, and a dynamic atmosphere-ocean response is important during the SH winter. The Chandler wobble frequency F and quality factor Q are estimated by least squares using polar motion data in combination with proxy excitations derived from atmospheric data. Monte Carlo tests show that this approach can provide useful improvements over traditional maximum likelihood methods, which use only observed polar motion. With less than a decade of good simultaneous polar motion and atmospheric data there is no new information about Q, but 90% confidence intervals for F are near ±0.004 cycles per year (cpy), making them comparable to maximum likelihood results based on nearly a century of historical polar motion data. Using a proxy excitation constructed from a linear combination of atmospheric EAM over land and SH ocean, the estimate of F is near 0.831 cpy (a period of 439.5 days), which is significantly different from the maximum likelihood value near 0.843 cpy (433 days). This difference can be understood in light of the assumptions underlying the two methods.
Book Synopsis Sciences of Geodesy - I by : Guochang Xu
Download or read book Sciences of Geodesy - I written by Guochang Xu and published by Springer Science & Business Media. This book was released on 2010-09-09 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: This series of reference books describes sciences of different elds in and around geodesy with independent chapters. Each chapter covers an individual eld and describes the history, theory, objective, technology, development, highlights of research and applications. In addition, problems as well as future directions are discussed. The subjects of this reference book include Absolute and Relative Gravimetry, Adaptively Robust Kalman Filters with Applications in Navigation, Airborne Gravity Field Determination, Analytic Orbit Theory, Deformation and Tectonics, Earth Rotation, Equivalence of GPS Algorithms and its Inference, Marine Geodesy, Satellite Laser Ranging, Superconducting Gravimetry and Synthetic Aperture Radar Interferometry. These are individual subjects in and around geodesy and are for the rst time combined in a unique book which may be used for teaching or for learning basic principles of many subjects related to geodesy. The material is suitable to provide a general overview of geodetic sciences for high-level geodetic researchers, educators as well as engineers and students. Some of the chapters are written to ll literature blanks of the related areas. Most chapters are written by well-known scientists throughout the world in the related areas. The chapters are ordered by their titles. Summaries of the individual chapters and introductions of their authors and co-authors are as follows. Chapter 1 “Absolute and Relative Gravimetry” provides an overview of the gravimetric methods to determine most accurately the gravity acceleration at given locations.
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
Download or read book Tidal Phenomena written by Helmut Wilhelm and published by Springer. This book was released on 1997-06-25 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents many types of tidal phenomena. The contributions evolved from a seminar in Oberwolfach, Black Forest, where German experts on tidal research met in October 1994 to present their views and experience to interested graduate students and scientists in an informal way. The seminar focused on earth tides, tides of the atmosphere and the oceans, including solar-induced variations of the magnetic field and climate, and tidal phenomena in the planetary system and universe. This book has an introductory character, but some contributions describe the state of the art in tidal research.
Download or read book Geodesy written by Wolfgang Torge and published by Walter de Gruyter. This book was released on 2012-05-29 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fourth edition of this textbook has been thoroughly revised in order to reflect the central role which geodesy has achieved in the past ten years. The Global Geodetic Observing System established by the IAG utilizes a variety of techniques to determine the geometric shape of the earth and its kinematics, the variations of earth rotation, and the earth’s gravity field. Space techniques play a fundamental role, with recent space missions also including gravity field recovery. Terrestrial techniques are important for regional and local applications, and for validating the results of the space missions. Global and regional reference systems are now well established and widely used. They also serve as a basis for geo-information systems. The analysis of the time variation of the geodetic products provides the link to other geosciences and contributes to proper modelling of geodynamic processes. The book follows the principal directions of geodesy, providing the theoretical background as well as the principles of measurement and evaluation methods. Selected examples of instruments illustrate the geodetic work. An extensive reference list supports further studies. The book is intended to serve as an introductory textbook for graduate students as well as a reference for scientists and engineers in the fields of geodesy, geophysics, surveying engineering and geomatics.
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.
Book Synopsis The Interaction Between Earth's Rotation and Geophysical Processes by : Nikolay S. Sidorenkov
Download or read book The Interaction Between Earth's Rotation and Geophysical Processes written by Nikolay S. Sidorenkov and published by John Wiley & Sons. This book was released on 2009-08-14 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filling an important gap in the geophysical literature at specialist level, this monograph is the only up-to-date title to provide a link between the Earth's rotation and its atmo- and hydrosphere, including the ice masses. Starting with the Earth's motions, the text goes on to look at irregularities and the effect of atmospheric processes on the Earth's spin. Tides and seasons occupy the following sections before a discussion of the Earth-ocean-atmosphere system and the mechanical action of the atmosphere on the Earth's rotation. The whole is rounded off by an index of abbreviations and appendices with sections on related physics for better readability, plus a comprehensive bibliography for further reading. A must for geophysicists, oceanographers, glaciologists, climatologists and meteorologists alike.
Book Synopsis Earth on the Edge: Science for a Sustainable Planet by : Chris Rizos
Download or read book Earth on the Edge: Science for a Sustainable Planet written by Chris Rizos and published by Springer Science & Business Media. This book was released on 2013-12-13 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book series is composed of peer-reviewed proceedings of selected symposia organized by the International Association of Geodesy. It deals primarily with topics related to Geodesy Earth Sciences : terrestrial reference frame, Earth gravity field, Geodynamics and Earth rotation, Positioning and engineering applications.
Book Synopsis Theory of the Excitation of the Earth's Polar Motion by : N. Sekiguchi
Download or read book Theory of the Excitation of the Earth's Polar Motion written by N. Sekiguchi and published by . This book was released on 1994 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Window on the Future of Geodesy by : Fernando Sansò
Download or read book A Window on the Future of Geodesy written by Fernando Sansò and published by Springer Science & Business Media. This book was released on 2006-06-09 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings represent the worldwide picture of the state of the art of geodesy. The volume comprehensively covers the most recent results and supplies a good review of the new ideas developing in the field, opening a window to the future of geodesy.
Book Synopsis Atmospheric Effects in Space Geodesy by : Johannes Böhm
Download or read book Atmospheric Effects in Space Geodesy written by Johannes Böhm and published by Springer Science & Business Media. This book was released on 2013-06-12 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Various effects of the atmosphere have to be considered in space geodesy and all of them are described and treated consistently in this textbook. Two chapters are concerned with ionospheric and tropospheric path delays of microwave and optical signals used by space geodetic techniques, such as the Global Navigation Satellite Systems (GNSS), Very Long Baseline Interferometry (VLBI), or Satellite Laser Ranging (SLR). It is explained how these effects are best reduced and modelled to improve the accuracy of space geodetic measurements. Other chapters are on the deformation of the Earth’s crust due to atmospheric loading, on atmospheric excitation of Earth rotation, and on atmospheric effects on gravity field measurements from special satellite missions such as CHAMP, GRACE, and GOCE. All chapters have been written by staff members of the Department of Geodesy and Geoinformation at TU Wien who are experts in the particular fields.
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.
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)
Book Synopsis Meteorological Excitation of the Earth's Wobble by : Clark Roland Wilson
Download or read book Meteorological Excitation of the Earth's Wobble written by Clark Roland Wilson and published by . This book was released on 1975 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
