Causes of Coastal Sea Level Change

XU Tianhe; YANG Yuanyuan; MU Dapeng; YIN Peng

doi:10.13203/j.whugis20210643

Volume 47 Issue 10

Oct. 2022

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Geomatics and Information Science of Wuhan University > 2022 > 47(10): 1750-1757. > DOI: 10.13203/j.whugis20210643

XU Tianhe, YANG Yuanyuan, MU Dapeng, YIN Peng. Causes of Coastal Sea Level Change[J]. Geomatics and Information Science of Wuhan University, 2022, 47(10): 1750-1757. DOI: 10.13203/j.whugis20210643

Citation:

XU Tianhe, YANG Yuanyuan, MU Dapeng, YIN Peng. Causes of Coastal Sea Level Change[J]. Geomatics and Information Science of Wuhan University, 2022, 47(10): 1750-1757. DOI: 10.13203/j.whugis20210643

Citation:

XU Tianhe, YANG Yuanyuan, MU Dapeng, YIN Peng. Causes of Coastal Sea Level Change[J]. Geomatics and Information Science of Wuhan University, 2022, 47(10): 1750-1757. DOI: 10.13203/j.whugis20210643

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Causes of Coastal Sea Level Change

1.
Institute of Space Sciences, Shandong University, Weihai 264209, China
2.
School of City and Regional Planning, Yancheng Teachers University, Yancheng 224002, China

Funds:

The National Natural Science Foundation of China 42192534

The National Natural Science Foundation of China 41904081

the National Key Research and Development Program of China 2020YFB0505800

More Information

Author Bio:
XU Tianhe, PhD, professor, specializes in satellite geodesy and geodetic data processing. E-mail: thxu@sdu.edu.cn
Received Date: March 29, 2022
Available Online: April 20, 2022
Published Date: October 04, 2022

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Abstract

Abstract

Objectives Coastal sea level rise poses direct threats to human livelihood. It is of scientific importance to understand the causes and provide useful strategies for adapting sea level rise. This paper aims to investigate the causes of coastal sea level change using satellite altimetry, satellite time-variable gravity, and Argo floats.
Methods Given that time-variable gravity suffers from serious leakage issue over coastal area, we use land mass variations from a mascon solution to simulate the leakage from land into oceans, which is estimated to be 0.68 mm/a.
Results On seasonal and non-seasonal scales, satellite altimetry measurements are well explained by the summation of time-variable gravity and Argo floats, demonstrating the closure of coastal sea level change.Satellite altimetry suggests a rate of 3.32±0.45 mm/a for coastal sea level rise, but the summation of time-variable gravity and Argo floats yields a rate of 2.25±0.51 mm/a.
Conclusions The rate discrepancy is about 1 mm/a in coastal sea level budget, which suggestes that closing the sea level budget for coastal zone is challenged by uncertainties. The in situ measurements are sparse for Argo over coastal zone, which may underestimate the steric trend. Furthermore, leakage correction and vertical land motion may also cause uncertainties.
- sea level change,
- satellite altimetry,
- time-variable gravity,
- coastal zone

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References

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