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

Citation

King, MA and Keshin, M and Whitehouse, PL and Thomas, ID and Milne, G and Riva, REM, Regional biases in absolute sea-level estimates from tide gauge data due to residual unmodeled vertical land movement, Geophysical Research Letters, 39, (14) Article L14604. ISSN 0094-8276 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 American Geophysical Union

DOI: doi:10.1029/2012GL052348

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 ~300 GPS stations located near to a global set of tide gauges, and find regionally coherent differences of commonly 0.52 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.

Item Details

Item Type:Refereed Article
Keywords:sea level, vertical land movement
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Geodesy
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate and Climate Change not elsewhere classified
Author:King, MA (Professor Matt King)
ID Code:89653
Year Published:2012
Web of Science® Times Cited:23
Deposited By:Geography and Environmental Studies
Deposited On:2014-03-11
Last Modified:2014-05-22
Downloads:0

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