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

Authors

Li,  Zhao
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lu,  Ran
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jiang,  Weiping
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lei,  Jintao
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Dong,  Danan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Yang,  Kaichun
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ding,  Xin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lu,  Yang
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chen,  Qusen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chen,  Hua
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

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


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020675
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.