Seasonal Polar Motion Excitation From Numerical Models Of Atmosphere Ocean And Continental Hydrosphere

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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.

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.

Atmospheric Effects in Space Geodesy

Author : Johannes Böhm
Publisher : Springer Science & Business Media
ISBN 13 : 3642369324
Total Pages : 244 pages
Book Rating : 4.6/5 (423 download)

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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.

Precession, Nutation and Wobble of the Earth

Author : V. Dehant
Publisher : Cambridge University Press
ISBN 13 : 110709254X
Total Pages : 553 pages
Book Rating : 4.1/5 (7 download)

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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.

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.

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

Global Change and Future Earth

Author : Tom Beer
Publisher : Cambridge University Press
ISBN 13 : 1107171598
Total Pages : 447 pages
Book Rating : 4.1/5 (71 download)

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Book Synopsis Global Change and Future Earth by : Tom Beer

Download or read book Global Change and Future Earth written by Tom Beer and published by Cambridge University Press. This book was released on 2018-10-18 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Authoritative reviews on the wide-ranging ramifications of climate change, from an international team of eminent researchers.

Atmospheric Excitation of Polar Motion

Author : John William Kuehne
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (376 download)

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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.

Geodesy

Author : Wolfgang Torge
Publisher : Walter de Gruyter
ISBN 13 : 9783110170726
Total Pages : 436 pages
Book Rating : 4.1/5 (77 download)

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Book Synopsis Geodesy by : Wolfgang Torge

Download or read book Geodesy written by Wolfgang Torge and published by Walter de Gruyter. This book was released on 2001 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present state of geodesy is illustrated by selected examples of instruments and results of geodetic data processing. An extensive reference list supports further studies."--BOOK JACKET.

Spring Meeting

Author : American Geophysical Union. Meeting
Publisher :
ISBN 13 :
Total Pages : 474 pages
Book Rating : 4.5/5 (825 download)

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Book Synopsis Spring Meeting by : American Geophysical Union. Meeting

Download or read book Spring Meeting written by American Geophysical Union. Meeting and published by . This book was released on 1999 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Sciences of Geodesy - I

Author : Guochang Xu
Publisher : Springer Science & Business Media
ISBN 13 : 3642117414
Total Pages : 507 pages
Book Rating : 4.6/5 (421 download)

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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.

The Atmosphere and Climate of Mars

Author : Robert M. Haberle
Publisher : Cambridge University Press
ISBN 13 : 110817938X
Total Pages : 613 pages
Book Rating : 4.1/5 (81 download)

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Book Synopsis The Atmosphere and Climate of Mars by : Robert M. Haberle

Download or read book The Atmosphere and Climate of Mars written by Robert M. Haberle and published by Cambridge University Press. This book was released on 2017-06-29 with total page 613 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humanity has long been fascinated by the planet Mars. Was its climate ever conducive to life? What is the atmosphere like today and why did it change so dramatically over time? Eleven spacecraft have successfully flown to Mars since the Viking mission of the 1970s and early 1980s. These orbiters, landers and rovers have generated vast amounts of data that now span a Martian decade (roughly eighteen years). This new volume brings together the many new ideas about the atmosphere and climate system that have emerged, including the complex interplay of the volatile and dust cycles, the atmosphere-surface interactions that connect them over time, and the diversity of the planet's environment and its complex history. Including tutorials and explanations of complicated ideas, students, researchers and non-specialists alike are able to use this resource to gain a thorough and up-to-date understanding of this most Earth-like of planetary neighbours.

Earth's Climate Response to a Changing Sun

Author : Katja Matthes
Publisher :
ISBN 13 : 9782759818495
Total Pages : 0 pages
Book Rating : 4.8/5 (184 download)

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Book Synopsis Earth's Climate Response to a Changing Sun by : Katja Matthes

Download or read book Earth's Climate Response to a Changing Sun written by Katja Matthes and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For centuries, scientists have been fascinated by the role of the Sun in the Earth's climate system. Recent discoveries, outlined in this book, have gradually unveiled a complex picture, in which our variable Sun affects the climate variability via a number of subtle pathways, the implications of which are only now becoming clear. This handbook provides the scientifically curious, from undergraduate students to policy makers with a complete and accessible panorama of our present understanding of the Sun-climate connection. 61 experts from different communities have contributed to it, which reflects the highly multidisciplinary nature of this topic. The handbook is organised as a mosaic of short chapters, each of which addresses a specific aspect, and can be read independently. The reader will learn about the assumptions, the data, the models, and the unknowns behind each mechanism by which solar variability may impact climate variability. None of these mechanisms can adequately explain global warming observed since the 1950s. However, several of them do impact climate variability, in particular on a regional level. This handbook aims at addressing these issues in a factual way, and thereby challenge the reader to sharpen his/her critical thinking in a debate that is frequently distorted by unfounded claims.

Global Geodetic Observing System

Author : Hans-Peter Plag
Publisher : Springer Science & Business Media
ISBN 13 : 3642026877
Total Pages : 367 pages
Book Rating : 4.6/5 (42 download)

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Book Synopsis Global Geodetic Observing System by : Hans-Peter Plag

Download or read book Global Geodetic Observing System written by Hans-Peter Plag and published by Springer Science & Business Media. This book was released on 2009-07-25 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Global Geodetic Observing System (GGOS) has been established by the Int- national Association of Geodesy (IAG) in order to integrate the three fundamental areas of geodesy, so as to monitor geodetic parameters and their temporal varia- ?9 tions, in a global reference frame with a target relative accuracy of 10 or b- ter. These areas, often called ‘pillars’, deal with the determination and evolution of (a) the Earth’s geometry (topography, bathymetry, ice surface, sea level), (b) the Earth’s rotation and orientation (polar motion, rotation rate, nutation, etc. ), and (c) the Earth’s gravity eld (gravity, geoid). Therefore, Earth Observation on a global scale is at the heart of GGOS’s activities, which contributes to Global Change - search through the monitoring, as well as the modeling, of dynamic Earth processes such as, for example, mass and angular momentum exchanges, mass transport and ocean circulation, and changes in sea, land and ice surfaces. To achieve such an - bitious goal, GGOS relies on an integrated network of current and future terrestrial, airborne and satellite systems and technologies. These include: various positioning, navigation, remote sensing and dedicated gravity and altimetry satellite missions; global ground networks of VLBI, SLR, DORIS, GNSS and absolute and relative gravity stations; and airborne gravity, mapping and remote sensing systems.

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.

Ocean Modeling in an Eddying Regime

Author : Matthew W. Hecht
Publisher : John Wiley & Sons
ISBN 13 : 1118671996
Total Pages : 654 pages
Book Rating : 4.1/5 (186 download)

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Book Synopsis Ocean Modeling in an Eddying Regime by : Matthew W. Hecht

Download or read book Ocean Modeling in an Eddying Regime written by Matthew W. Hecht and published by John Wiley & Sons. This book was released on 2013-04-30 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 177. This monograph is the first to survey progress in realistic simulation in a strongly eddying regime made possible by recent increases in computational capability. Its contributors comprise the leading researchers in this important and constantly evolving field. Divided into three parts Oceanographic Processes and Regimes: Fundamental Questions Ocean Dynamics and State: From Regional to Global Scale, and Modeling at the Mesoscale: State of the Art and Future Directions The volume details important advances in physical oceanography based on eddy resolving ocean modeling. It captures the state of the art and discusses issues that ocean modelers must consider in order to effectively contribute to advancing current knowledge, from subtleties of the underlying fluid dynamical equations to meaningful comparison with oceanographic observations and leading-edge model development. It summarizes many of the important results which have emerged from ocean modeling in an eddying regime, for those interested broadly in the physical science. More technical topics are intended to address the concerns of those actively working in the field.

Geodetic Reference Frames

Author : Hermann Drewes
Publisher : Springer Science & Business Media
ISBN 13 : 3642008607
Total Pages : 312 pages
Book Rating : 4.6/5 (42 download)

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Book Synopsis Geodetic Reference Frames by : Hermann Drewes

Download or read book Geodetic Reference Frames written by Hermann Drewes and published by Springer Science & Business Media. This book was released on 2009-06-22 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geodetic reference frames are the basis for The programme of the Symposium was divided three-dimensional, time dependent positioning according to the Sub-commissions, Projects in all global, regional and national networks, in and Study Groups of Commission 1 into eight cadastre, engineering, precise navigation, geo- general themes: information systems, geodynamics, sea level studies, and other geosciences. They are 1. Combination of space techniques necessary to consistently estimate unknown 2. Global reference frames and Earth rotation parameters using geodetic observations, e. g. , 3. Regional reference frames station coordinates, Earth orientation and 4. Interaction of terrestrial and celestial frames rotation parameters. Commission 1 “Reference 5. Vertical reference frames Frames” of the International Association of 6. Ionosphere modelling and analysis Geodesy (IAG) was established within the new 7. Satellite altimetry structure of IAG in 2003 with the mission to 8. Use of GNSS for reference frames study the fundamental scientific problems for the establishment of reference frames. One day of the Symposium was dedicated to a The principal objective of the scientific work joint meeting with the International Congress of the Commission is basic research on: of Federación Internationale des Géomètres - Definition, establishment, maintenance, and (FIG) and the INTERGEO congress of the improvement of geodetic reference frames. German Association of Surveying, Geo- - Advanced development of terrestrial and information and Land Management. The space observation techniques for this contributions presented at this meeting are purpose. integrated into these proceedings.