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Filling the gap in the IERS C01 polar motion series in 1858.9–1860.9.

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Title: Filling the gap in the IERS C01 polar motion series in 1858.9–1860.9.
Authors: Malkin, Zinovy1 (AUTHOR) malkin@gaoran.ru, Golyandina, Nina2 (AUTHOR) n.golyandina@spbu.ru, Olenev, Roman2 (AUTHOR) roman.olenev.cs@mail.ru
Source: Journal of Geodesy. Jul2025, Vol. 99 Issue 7, p1-13. 13p.
Subjects: Astronomical models, Cartesian coordinates, Spectrum analysis, Parametric modeling, Test methods
Abstract: The C01 Earth orientation parameters series provided by the International Earth Rotation and Reference Systems Service (IERS) is the longest reliable record of the Earth rotation. In particular, the polar motion (PM) series beginning from 1846 provides a basis for investigation of the long-term PM variations. However, the pole coordinate Y p in the IERS C01 PM series has a 2-year gap, which makes this series not completely evenly spaced. This paper presents the results of the first attempt to overcome this problem and discusses some ways to fill this gap. Two novel approaches were considered for this purpose: parametric astronomical model consisting of the bias and the Chandler and annual wobbles with linearly changing amplitudes, and data-driven model based on singular spectrum analysis (SSA). Both methods were tested with various options to ensure robust and reliable results. The results obtained by the two methods generally agree within the Y p errors in the IERS C01 series, but the results obtained by the SSA approach can be considered preferable because it is based on a more complete PM model. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geodesy is the property of Springer Nature 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.)
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  Data: Filling the gap in the IERS C01 polar motion series in 1858.9–1860.9.
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  Data: <searchLink fieldCode="DE" term="%22Astronomical+models%22">Astronomical models</searchLink><br /><searchLink fieldCode="DE" term="%22Cartesian+coordinates%22">Cartesian coordinates</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Parametric+modeling%22">Parametric modeling</searchLink><br /><searchLink fieldCode="DE" term="%22Test+methods%22">Test methods</searchLink>
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  Data: The C01 Earth orientation parameters series provided by the International Earth Rotation and Reference Systems Service (IERS) is the longest reliable record of the Earth rotation. In particular, the polar motion (PM) series beginning from 1846 provides a basis for investigation of the long-term PM variations. However, the pole coordinate Y p in the IERS C01 PM series has a 2-year gap, which makes this series not completely evenly spaced. This paper presents the results of the first attempt to overcome this problem and discusses some ways to fill this gap. Two novel approaches were considered for this purpose: parametric astronomical model consisting of the bias and the Chandler and annual wobbles with linearly changing amplitudes, and data-driven model based on singular spectrum analysis (SSA). Both methods were tested with various options to ensure robust and reliable results. The results obtained by the two methods generally agree within the Y p errors in the IERS C01 series, but the results obtained by the SSA approach can be considered preferable because it is based on a more complete PM model. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Journal of Geodesy is the property of Springer Nature 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.)
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        Value: 10.1007/s00190-025-01978-y
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      – Code: eng
        Text: English
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        PageCount: 13
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      – SubjectFull: Astronomical models
        Type: general
      – SubjectFull: Cartesian coordinates
        Type: general
      – SubjectFull: Spectrum analysis
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      – SubjectFull: Parametric modeling
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      – SubjectFull: Test methods
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      – TitleFull: Filling the gap in the IERS C01 polar motion series in 1858.9–1860.9.
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            – D: 01
              M: 07
              Text: Jul2025
              Type: published
              Y: 2025
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