Volume 40 Issue 1
Feb.  2021
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Jiachun An, Baojun Zhang, Songtao Ai, Zemin Wang, Yu Feng. Evaluation of vertical crustal movements and sea level changes around Greenland from GPS and tide gauge observations[J]. Acta Oceanologica Sinica, 2021, 40(1): 4-12. doi: 10.1007/s13131-021-1719-0
Citation: Jiachun An, Baojun Zhang, Songtao Ai, Zemin Wang, Yu Feng. Evaluation of vertical crustal movements and sea level changes around Greenland from GPS and tide gauge observations[J]. Acta Oceanologica Sinica, 2021, 40(1): 4-12. doi: 10.1007/s13131-021-1719-0

Evaluation of vertical crustal movements and sea level changes around Greenland from GPS and tide gauge observations

doi: 10.1007/s13131-021-1719-0
Funds:  The National Key R&D Program of China under contract No. 2016YFC1402701; the National Natural Science Foundation of China under contract Nos 41941010, 41531069 and 41476162.
More Information
  • Corresponding author: bjzhang@whu.edu.cn; E-mail: ast@whu.edu.cn
  • Received Date: 2020-08-27
  • Accepted Date: 2020-09-29
  • Available Online: 2021-04-21
  • Publish Date: 2021-01-25
  • To better monitor the vertical crustal movements and sea level changes around Greenland, multiple data sources were used in this paper, including global positioning system (GPS), tide gauge, satellite gravimetry, satellite altimetry, glacial isostatic adjustment (GIA). First, the observations of more than 50 GPS stations from the international GNSS service (IGS) and Greenland network (GNET) in 2007–2018 were processed and the common mode error (CME) was eliminated with using the principal component analysis (PCA). The results show that all GPS stations show an uplift trend and the stations in southern Greenland have a higher vertical speed. Second, by deducting the influence of GIA, the impact of current GrIS mass changes on GPS stations was analysed, and the GIA-corrected vertical velocity of the GPS is in good agreement with the vertical velocity obtained by gravity recovery and climate experiment (GRACE). Third, the absolute sea level change around Greenland at 4 gauge stations was obtained by combining relative sea level derived from tide gauge observations and crustal uplift rates derived from GPS observations, and was validated by sea level products of satellite altimetry. The results show that although the mass loss of GrIS can cause considerable global sea level rise, eustatic movements along the coasts of Greenland are quite complex under different mechanisms of sea level changes.
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