Toggle Main Menu Toggle Search

Open Access padlockePrints

Geocentric sea level trend using GPS and >100-year tide gauge record on a postglacial rebound nodal line

Lookup NU author(s): Dr Dogan Sanli, Professor Geoffrey Blewitt


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


For studies of global sea level change, 103 years of tide gauge data were analyzed from North Shields on the North Sea coast of Great Britain, near a predicted nodal line of postglacial rebound (PGR). Simultaneous estimation of statistically significant tidal components gives a relative sea level rate of 1.8 ± 0.1 mm/yr with no significant acceleration. Analysis of a Global Positioning System (GPS) station, which we installed directly on the tide gauge structure, shows the tide gauge rising at 1.4 ± 1.5 mm/yr relative to the international terrestrial reference frame (ITRF96). Leveling shows the tide gauge rising with statistical significance at 0.8 ± 0.2 mm/yr relative to a nearby lighthouse (0.5 km away) situated on bedrock. Thus our geodetic estimate of geocentric crustal rise is 0.6 ± 1.5 mm/yr, which is consistent with the PGR nodal hypothesis. Our estimate of geocentric sea level rise using local leveling and assuming the PGR nodal hypothesis (i.e., zero crustal rise with no model uncertainty) is therefore 2.6 ± 0.2 mm/yr. Introducing an upper bound error based on observational evidence and PGR model differences modifies this to 2.6 ± 1.0 mm/yr. This is to be compared with our model-independent GPS-based estimate of 3.2 ± 1.5 mm/yr. We conclude that PGR and geodesy corroborate a geocentric sea level rise of 2.6 ± 1.0 mm/yr (upper bound), which is larger than the tide gauge records alone (1.8 mm/yr) would indicate. Copyright 2001 by the American Geophysical Union.

Publication metadata

Author(s): Sanli DU, Blewitt G

Publication type: Article

Publication status: Published

Journal: Journal of Geophysical Research B: Solid Earth

Year: 2001

Volume: 106

Issue: 1

Pages: 713-719

Print publication date: 01/01/2001

ISSN (print): 1934-8843

ISSN (electronic): 1934-2098

Publisher: American Geophysical Union


DOI: 10.1029/2000JB900348


Altmetrics provided by Altmetric