Poster (Scientific congresses, symposiums and conference proceedings)
Consolidating Observation of Land and Sea Level Changes around South Georgia Island
Teferle, Felix Norman; Hunegnaw, Addisu; Hibbert, Angela et al.
2019AGU Fall Meeting 2019
 

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Keywords :
Global Navigation Satellite System; Geodetic Monitoring; Vertical land movements; Sea Level Rise; South Georgia
Abstract :
[en] With its mid-ocean location in the Southern Atlantic Ocean South Georgia Island is in a key position for the oceanic and geodetic global monitoring networks. Since 2013 the tide gauge at King Edward Point (KEP) with GLOSS ID 187 has been monitored using a GNSS station nearby on Brown Mountain. By accurately geo-referencing the tide gauge and monitoring any vertical land movements, a continuous record of its datum within the Permanent Service for Mean Sea Level (PSMSL) can be established, which in turn makes the recorded and averaged sea levels useful for long-term studies and satellite altimetry calibrations. In 2014 another GNSS station was installed at KEP after local subsidence was sus-pected and later on three additional GNSS stations came to service at the periphery of the main island, making it possible to monitor uplift/subsidence wider afield. Further-more, together with four precise levelling campaigns of the KEP benchmark network in 2013, 2014 and two in 2017, it has also been possible to investigate the very local character of the vertical motions near KEP, i.e. the stability of the jetty upon which the tide gauge is mounted. In this study, we will present the results from the GNSS and precise levelling meas-urements, and will discuss their impact on the sea level record from the KEP tide gauge and nearby satellite altimetry sea surface heights. This study comes at a timely manner as during the Austral Summer 2019/2020 the jetty will be stabilized and en-larged, and consequently the current tide gauge will be replaced by a new one. Our measurements show that uplift is observed all over South Georgia Island while the ar-ea at KEP and particularly the jetty with tide gauge are subsiding relative to the rest of the island. In contrast, results for the tide gauge record show a lower magnitude of ob-served sea level rise than expected from nearby satellite altimetry. We will revisit all geodetic and oceanic observations in an attempt to improve the agreement between these measurements to summarize the status before the work at the jetty begins.
Research center :
ULHPC - University of Luxembourg: High Performance Computing
Disciplines :
Earth sciences & physical geography
Author, co-author :
Teferle, Felix Norman ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Hunegnaw, Addisu  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit
Hibbert, Angela;  National Oceanography Centre - NOC
Williams, Simon;  National Oceanography Centre - NOC
Woodworth, Phil;  National Oceanography Centre - NOC
Dalziel, Ian;  University of Texas at Austin
Smalley, Robert Jr.;  The University of Memphis
Lawver, Laurence;  University of Texas at Austin
External co-authors :
yes
Language :
English
Title :
Consolidating Observation of Land and Sea Level Changes around South Georgia Island
Publication date :
13 December 2019
Number of pages :
1.8x1.2m
Event name :
AGU Fall Meeting 2019
Event organizer :
American Geophysical Union
Event place :
San Francisco, United States
Event date :
from 9-12-2019 to 13-12-2019
Audience :
International
Focus Area :
Computational Sciences
Name of the research project :
New Geodetic Infrastructure and Reprocessed GPS Solutions for Sea Level, Climate Change and Geodynamics - GSCG
Funders :
University of Luxembourg - UL
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since 11 December 2019

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