Accuracy assessment of global vertical displacement loading tide models for the equatorial and Indian Ocean

Xiaoqing Xu; Haidong Pan; Fei Teng; Zexun Wei

doi:10.1007/s13131-024-2358-z

Volume 43 Issue 9

Sep. 2024

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Article Navigation > Acta Oceanologica Sinica > 2024 > 43(9): 11-25

Xiaoqing Xu, Haidong Pan, Fei Teng, Zexun Wei. Accuracy assessment of global vertical displacement loading tide models for the equatorial and Indian Ocean[J]. Acta Oceanologica Sinica, 2024, 43(9): 11-25. doi: 10.1007/s13131-024-2358-z

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Xiaoqing Xu, Haidong Pan, Fei Teng, Zexun Wei. Accuracy assessment of global vertical displacement loading tide models for the equatorial and Indian Ocean[J]. Acta Oceanologica Sinica, 2024, 43(9): 11-25. doi: 10.1007/s13131-024-2358-z

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Accuracy assessment of global vertical displacement loading tide models for the equatorial and Indian Ocean

doi: 10.1007/s13131-024-2358-z

Xiaoqing Xu^{1, 2, 3
,},
Haidong Pan^{1, 2, 3},
Fei Teng^{1, 2, 3},
Zexun Wei^{1, 2, 3
,
,}

1.
First Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China
2.
Laboratory for Regional Oceanography and Numerical Modeling, Qingdao Marine Science and Technology Center, Qingdao 266237, China
3.
Shandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao 266061, China

Funds: The Shandong Provincial Natural Science Foundation under contract No. ZR2023QD045; the National Natural Science Foundation of China under contract Nos 42406026, 42076024 and 42106032.

More Information

Corresponding author: E-mail: weizx@fio.org.cn
Received Date: 2024-01-24
Accepted Date: 2024-06-02

Available Online: 2024-08-05

Publish Date: 2024-09-01

Abstract

Abstract

The three-dimensional displacements caused by ocean loading effects are significant enough to impact spatial geodetic measurements on sub-daily or longer timescales, particularly in the vertical direction. Currently, most tide models incorporate the distribution of vertical displacement loading tides; however, their accuracy has not been assessed for the equatorial and Indian Ocean regions. Global Positioning System (GPS) observations provide high-precision data on sea-level changes, enabling the assessment of the accuracy and reliability of vertical displacement tide models. However, because the tidal period of the K₂ constituent is almost identical to the orbital period of GPS constellations, the estimation of the K₂ tidal constituent from GPS observations is not satisfactory. In this study, the principle of smoothness is employed to correct the systematic error in K₂ estimates in GPS observations through quadratic fitting. Using the adjusted harmonic constants from 31 GPS stations for the equatorial and Indian Ocean, the accuracy of eight major constituents from five global vertical displacement tide models (FES2014, EOT11a, GOT4.10c, GOT4.8, and NAO.99b) is evaluated for the equatorial and Indian Ocean. The results indicate that the EOT11a and FES2014 models exhibit higher accuracy in the vertical displacement tide models for the equatorial and Indian Ocean, with root sum squares errors of 2.29 mm and 2.34 mm, respectively. Furthermore, a brief analysis of the vertical displacement tide distribution characteristics of the eight major constituents for the equatorial and Indian Ocean was conducted using the EOT11a model.
- accuracy assessment,
- vertical displacement loading tide models,
- tidal admittance,
- equatorial and Indian Ocean,
- GPS constellation

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References(23)

References

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