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

journal contribution
posted on 2023-05-17, 23:05 authored by Matt KingMatt King, Keshin, M, Whitehouse, PL, Thomas, ID, Milne, G, Riva, REM
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 +-0.5-2 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.

History

Publication title

Geophysical Research Letters

Volume

39

Issue

14

Article number

L14604

Number

L14604

Pagination

1-5

ISSN

0094-8276

Department/School

School of Geography, Planning and Spatial Sciences

Publisher

Amer Geophysical Union

Place of publication

2000 Florida Ave Nw, Washington, USA, Dc, 20009

Rights statement

Copyright 2012 American Geophysical Union

Repository Status

  • Restricted

Socio-economic Objectives

Understanding climate change not elsewhere classified

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