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Uncertainty of the 20th century sea-level rise due to vertical land motion errors


Santamaria-Gomez, A and Gravelle, M and Dangendorf, S and Marcos, M and Spada, G and Woppelmann, G, Uncertainty of the 20th century sea-level rise due to vertical land motion errors, Earth and Planetary Science Letters, 473 pp. 24-32. ISSN 0012-821X (2017) [Refereed Article]

Copyright Statement

2017 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.epsl.2017.05.038


Assessing the vertical land motion (VLM) at tide gauges (TG) is crucial to understanding global and regional mean sea-level changes (SLC) over the last century. However, estimating VLM with accuracy better than a few tenths of a millimeter per year is not a trivial undertaking and many factors, including the reference frame uncertainty, must be considered. Using a novel reconstruction approach and updated geodetic VLM corrections, we found the terrestrial reference frame and the estimated VLM uncertainty may contribute to the global SLC rate error by 0.2 mmyr-1. In addition, a spurious global SLC acceleration may be introduced up to 4.8 x 10-3 mmyr-2. Regional SLC rate and acceleration errors may be inflated by a factor 3 compared to the global. The difference of VLM from two independent Glacio-Isostatic Adjustment models introduces global SLC rate and acceleration biases at the level of 0.1 mmyr-1and 2.8 x 10-3 mmyr-2, increasing up to 0.5 mm yr-1 and 9 x 10-3 mmyr-2 for the regional SLC. Errors in VLM corrections need to be budgeted when considering past and future SLC scenarios.

Item Details

Item Type:Refereed Article
Keywords:vertical land motion, GPS, GIA, reference frame, tide gauges, sea-level reconstruction
Research Division:Engineering
Research Group:Geomatic engineering
Research Field:Geospatial information systems and geospatial data modelling
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Climate variability (excl. social impacts)
UTAS Author:Santamaria-Gomez, A (Dr Alvaro Santamaria-Gomez)
ID Code:118150
Year Published:2017
Web of Science® Times Cited:81
Deposited By:Geography and Spatial Science
Deposited On:2017-07-05
Last Modified:2018-05-22

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