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Geocenter motion and its geodetic and geophysical implications

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Title: Geocenter motion and its geodetic and geophysical implications
Authors: Wu, Xiaoping1 xp_wu@yahoo.com, Ray, Jim2, van Dam, Tonie3
Source: Journal of Geodynamics. Jul2012, Vol. 58, p44-61. 18p.
Subjects: Maritime shipping, Runoff, Climate change, Hydrology, Atmospheric circulation, Wavelengths, Surface of the earth
Abstract: Abstract: The horizontal transport of water in Earth''s surface layer, including sea level change, deglaciation, and surface runoff, is a manifestation of many geophysical processes. These processes entail ocean and atmosphere circulation and tidal attraction, global climate change, and the hydrological cycle, all having a broad range of spatiotemporal scales. The largest atmospheric mass variations occur mostly at synoptic wavelengths and at seasonal time scales. The longest wavelength component of surface mass transport, the spherical harmonic degree-1, involves the exchange of mass between the northern and southern hemispheres. These degree-1 mass loads deform the solid Earth, including its surface, and induce geocenter motion between the center-of-mass of the total Earth system (CM) and the center-of-figure (CF) of the solid Earth surface. Because geocenter motion also depends on the mechanical properties of the solid Earth, monitoring geocenter motion thus provides an additional opportunity to probe deep into Earth''s interior. Most modern geodetic measurement systems rely on tracking data between ground stations and satellites that orbit around CM. Consequently, geocenter motion is intimately related to the realization of the International Terrestrial Reference Frame (ITRF) origin, and, in various ways, affects many of our measurement objectives for global change monitoring. In the last 15 years, there have been vast improvements in geophysical fluid modeling and in the global coverage, densification, and accuracy of geodetic observations. As a result of these developments, tremendous progress has been made in the study of geocenter motion over the same period. This paper reviews both the theoretical and measurement aspects of geocenter motion and its implications. [Copyright &y& Elsevier]
Copyright of Journal of Geodynamics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 74552582
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Geocenter motion and its geodetic and geophysical implications
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  Data: <searchLink fieldCode="AR" term="%22Wu%2C+Xiaoping%22">Wu, Xiaoping</searchLink><relatesTo>1</relatesTo><i> xp_wu@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Ray%2C+Jim%22">Ray, Jim</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22van+Dam%2C+Tonie%22">van Dam, Tonie</searchLink><relatesTo>3</relatesTo>
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  Data: <searchLink fieldCode="DE" term="%22Maritime+shipping%22">Maritime shipping</searchLink><br /><searchLink fieldCode="DE" term="%22Runoff%22">Runoff</searchLink><br /><searchLink fieldCode="DE" term="%22Climate+change%22">Climate change</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrology%22">Hydrology</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+circulation%22">Atmospheric circulation</searchLink><br /><searchLink fieldCode="DE" term="%22Wavelengths%22">Wavelengths</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+of+the+earth%22">Surface of the earth</searchLink>
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  Data: Abstract: The horizontal transport of water in Earth''s surface layer, including sea level change, deglaciation, and surface runoff, is a manifestation of many geophysical processes. These processes entail ocean and atmosphere circulation and tidal attraction, global climate change, and the hydrological cycle, all having a broad range of spatiotemporal scales. The largest atmospheric mass variations occur mostly at synoptic wavelengths and at seasonal time scales. The longest wavelength component of surface mass transport, the spherical harmonic degree-1, involves the exchange of mass between the northern and southern hemispheres. These degree-1 mass loads deform the solid Earth, including its surface, and induce geocenter motion between the center-of-mass of the total Earth system (CM) and the center-of-figure (CF) of the solid Earth surface. Because geocenter motion also depends on the mechanical properties of the solid Earth, monitoring geocenter motion thus provides an additional opportunity to probe deep into Earth''s interior. Most modern geodetic measurement systems rely on tracking data between ground stations and satellites that orbit around CM. Consequently, geocenter motion is intimately related to the realization of the International Terrestrial Reference Frame (ITRF) origin, and, in various ways, affects many of our measurement objectives for global change monitoring. In the last 15 years, there have been vast improvements in geophysical fluid modeling and in the global coverage, densification, and accuracy of geodetic observations. As a result of these developments, tremendous progress has been made in the study of geocenter motion over the same period. This paper reviews both the theoretical and measurement aspects of geocenter motion and its implications. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Geodynamics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=74552582
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jog.2012.01.007
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      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 44
    Subjects:
      – SubjectFull: Maritime shipping
        Type: general
      – SubjectFull: Runoff
        Type: general
      – SubjectFull: Climate change
        Type: general
      – SubjectFull: Hydrology
        Type: general
      – SubjectFull: Atmospheric circulation
        Type: general
      – SubjectFull: Wavelengths
        Type: general
      – SubjectFull: Surface of the earth
        Type: general
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      – TitleFull: Geocenter motion and its geodetic and geophysical implications
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            NameFull: Wu, Xiaoping
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            NameFull: Ray, Jim
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            NameFull: van Dam, Tonie
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            – D: 01
              M: 07
              Text: Jul2012
              Type: published
              Y: 2012
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              Value: 58
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