Reference : A New Datum-Controlled Tide Gauge Record for Sea Level Studies in the South Atlantic ...
Scientific congresses, symposiums and conference proceedings : Poster
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/10993/21230
A New Datum-Controlled Tide Gauge Record for Sea Level Studies in the South Atlantic Ocean: King Edward Point, South Georgia Island
English
Teferle, Felix Norman mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Hunegnaw, Addisu mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Engineering Research Unit]
Woodworth, P. L. [National Oceanography Centre]
Foden, Peter R. [National Oceanography Centre]
Williams, S. D. P. [National Oceanography Centre]
Pugh, Jeffrey [National Oceanography Centre]
Hibbert, Angela [National Oceanography Centre]
12-Jun-2015
80 x 100 cm
No
No
International
Global and Regional Sea Level Variability and Change
from 10-06-2015 to 12-06-2015
Palma de Mallorca
Spain
[en] Global Navigation Satellite Systems ; South Atlantic Ocean ; King Edward Point ; Tide Gauge ; South Georgia Island
[en] In 2008 a new pressure tide gauge with Global Sea Level Observing System Number 187 was installed at King Edward Point (KEP), South Georgia Island, South Atlantic Ocean. This installation was carried out as part of the Antarctic Circumpolar Current Levels by Altimetry and Island Measurements (ACCLAIM) programme. In 2013 the KEP Geodetic Observatory was established in support of various scientific applications including the monitoring of vertical land movements at KEP. Currently, the observatory consists of two state-of-the-art Global Navigation Satellite System (GNSS) stations with local benchmark networks. In 2014 a tide board was added to the tide gauge, which, together with the measurements from the KEP Geodetic Observatory, now enables a calibration of the tide gauge. This will make it possible to include the KEP tide gauge in the Permanent Service for Mean Sea Level (PSMSL) database and make it available for future sea level studies.
In this study, we will present the GNSS and levelling observations from the KEP Geodetic Observatory for the period from February 2013 to May 2015 used for the calibration of the tide gauge. While it is still too early to obtain accurate vertical land movement estimates from the GNSS data, the levelling campaigns in 2013 and 2014 indicated 7-9 mm of subsidence near the tide gauge. For the computation of the new height datum, geoid undulations derived from a seamless combination of the latest Gravity Observation Combination (GOCO) and Earth Gravitational Model (EGM) 2008 models were used. The use of this combined gravity model introduced a datum shift of approximately -24 cm compared to the previous datum.
University of Luxembourg - UL
New Geodetic Infrastructure and Re-Processed GPS Solutions for Sea Level, Climate Change and Geodynamics (GSCG)
Researchers
http://hdl.handle.net/10993/21230
Conference Paper

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