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  A refined full-spectrum bedrock thermal expansion model and its contribution on the vertical displacement of global GNSS reference stations

Li, Z., Lu, R., Jiang, W., Lei, J., Dong, D., Yang, K., Ding, X., Lu, Y., Chen, Q., Chen, H. (2023): A refined full-spectrum bedrock thermal expansion model and its contribution on the vertical displacement of global GNSS reference stations, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3871

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020675 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020675_1
Genre: Conference Paper

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 Creators:
Li, Zhao1, Author
Lu, Ran1, Author
Jiang, Weiping1, Author
Lei, Jintao1, Author
Dong, Danan1, Author
Yang, Kaichun1, Author
Ding, Xin1, Author
Lu, Yang1, Author
Chen, Qusen1, Author
Chen, Hua1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: The GNSS monument and its nearby bedrock both exhibit thermal expansion effect due to changes of surface temperature. However, previous studies treat the monument and its nearby bedrock below the ground surface as a whole without considering their bedrock depth, type, and material inconsistencies. Moreover, the existing finite element method (FEM) that consider nonseasonal variations is not easy to extend to consider the bedrock information. To address these problems, we propose a refined full-spectrum half-space bedrock thermal expansion model that consider both nonseasonal variations and bedrock information. Results show that the bedrock thermal vertical displacements (BTVD) estimated by our method is about 0.2 mm larger than that from FEM. The amplitude of BTVD becomes larger with increasing bedrock depth, and the phase lead is also obvious. The correlation coefficient between GNSS height and the environmental loading displacement improved by 1.6% to 21.9% after deducting the BTVD estimated by our method compared with FEM. Through investigating 80 globally distributed IGS stations, we find that the annual amplitude increases by up to 0.5 mm and the annual phase lead by up to 10° after considering bedrock depths. Different bedrock types also have a significant impact on the annual amplitude and phase of vertical displacement, with the correlation coefficient increased by 1.4% to 30.4%. Our work confirms the advantage of more rigorous bedrock thermal expansion modeling to correct the nonlinear variations of global GNSS reference stations, which might provide a possible clue to establish the terrestrial reference frame with 1 mm level.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-3871
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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