Monitoring absolute vertical land motions and absolute sea-level changes from GPS and tide gauges data over French PolynesiaOA
Monitoring absolute vertical land motions and absolute sea-level changes from GPS and tide gauges data over French Polynesia
In this study,we estimate the absolute vertical land motions at three tidal stations with collocated Global Navigation Satellite System(GNSS)receivers over French Polynesia during the period 2007-2020,and obtain,as ancillary results,estimates of the absolute changes in sea level at the same locations.To verify our processing approach to determining vertical motion,we first modeled vertical motion at the In-ternational GNSS Service(IGS)THTI station located in the capital island of Tahiti and compared our estimate with previous independent determinations,with a good agreement.We obtained the following estimates for the vertical land motions at the tide gauges:Tubuai island,Austral Archipelago-0.92±0.17 mm/yr,Vairao village,Tahiti Iti:-0.49±0.39 mm/yr,Rikitea,Gambier Archipelago-0.43±0.17 mm/yr.The absolute variations of the sea level are:Tubuai island,Austral Archipelago 5.25±0.60 mm/yr,Vairao village,Tahiti Iti:3.62±0.52 mm/yr,Rikitea,Gambier Archipelago 1.52±0.23 mm/yr.We discuss these absolute values in light of the values obtained from altimetric measurements and other means in French Polynesia.
Xianjie Li;Jean-Pierre Barriot;Bernard Ducarme;Marania Hopuare;Yidong Lou
Geodesy Observatory of Tahiti,University of French Polynesia,Faa'a 98702,French PolynesiaCatholic University of Louvain,Georges Lemaître Centre for Earth and Climate Research(ELI),1348 Louvain-la-Neuve,BelgiumGNSS Research Center,Wuhan University,Wuhan 430079,China||State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan University,Wuhan 430079,China
GPSTide gaugesSea level changesVertical land motion
《大地测量与地球动力学（英文版）》 2024 (001)
13-26 / 14
The PhD grant of Xianjie Li is funded by the University of French Polynesia.J.P.Barriot acknowledges funding by several successive"Decision Aide à la Recherche"(DAR)grants to the Geodesy Ob-servatory of Tahiti from the French Space Agency(CNES)and several successive fundings from the local government of French Polynesia(Observatoire Polynésien du Réchauffement Climatique).Y.Lou acknowledges funding by"National Natural Science Foun-dation of China"(Grand No.41931075)and funding by"the Fundamental Research Funds for the Central Universities"(Grand No.2042022kf1198).
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