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Regional biases in absolute sea-level estimates from tide gauge data due to residual unmodeled vertical land movement

Lookup NU author(s): Professor Matt King, Dr Maxim Keshin, Dr Ian Thomas

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Abstract

The only vertical land movement signal routinely corrected for when estimating absolute sea-level change from tide gauge data is that due to glacial isostatic adjustment (GIA). We compare modeled GIA uplift (ICE-5G + VM2) with vertical land movement at similar to 300 GPS stations located near to a global set of tide gauges, and find regionally coherent differences of commonly +/- 0.5-2 mm/yr. Reference frame differences and signal due to present-day mass trends cannot reconcile these differences. We examine sensitivity to the GIA Earth model by fitting to a subset of the GPS velocities and find substantial regional sensitivity, but no single Earth model is able to reduce the disagreement in all regions. We suggest errors in ice history and neglected lateral Earth structure dominate model-data differences, and urge caution in the use of modeled GIA uplift alone when interpreting regional- and global- scale absolute (geocentric) sea level from tide gauge data. Citation: King, M. A., M. Keshin, P. L. Whitehouse, I. D. Thomas, G. Milne, and R. E. M. Riva (2012), Regional biases in absolute sea-level estimates from tide gauge data due to residual unmodeled vertical land movement, Geophys. Res. Lett., 39, L14604, doi: 10.1029/2012GL052348.


Publication metadata

Author(s): King MA, Keshin M, Whitehouse PL, Thomas ID, Milne G, Riva REM

Publication type: Article

Publication status: Published

Journal: Geophysical Research Letters

Year: 2012

Volume: 39

Issue: 14

Print publication date: 27/07/2012

ISSN (print): 0094-8276

ISSN (electronic): 1944-8007

Publisher: American Geophysical Union

URL: http://dx.doi.org/10.1029/2012GL052348

DOI: 10.1029/2012GL052348


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Funding

Funder referenceFunder name
NERC
RCUK academic fellowship
ES0701COST action

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