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