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Ocean bottom deformation due to present-day mass redistribution and its impact on sea level observations
Citation
Frederikse, T and Riva, REM and King, MA, Ocean bottom deformation due to present-day mass redistribution and its impact on sea level observations, Geophysical Research Letters, 44, (24) pp. 12306-12314. ISSN 0094-8276 (2017) [Refereed Article]
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Copyright Statement
Copyright 2017 The Authors. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) https://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract
Present-day mass redistribution increases the total ocean mass and, on average, causes the ocean bottom to subside elastically. Therefore, barystatic sea-level rise is larger than the resulting global-mean geocentric sea-level rise,observed by satellite altimetry and GPS-corrected tide gauges. We use realistic estimates of mass redistribution from ice-mass loss and land-water storage to quantify the resulting ocean-bottom deformation and its effect on global and regional ocean-volume change estimates. Over 1993-2014, the resulting globally-averaged geocentric sea-level change is 8 percent smaller than the barystatic contribution. Over the altimetry domain, the difference is about 5 percent, and due to this effect, barystatic sea-level rise will be underestimated by more than 0.1 mm/y over 1993 -2014. Regional differences are of-ten larger: up to 1 mm/y over the Arctic Ocean and 0.4 mm/y in the South Pacific. Ocean bottom deformation should be considered when regional sea-level changes are observed in a geocentric reference frame.
Item Details
Item Type: | Refereed Article |
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Keywords: | vertical land movement, ice melt, sea level, altimetry, tide gauges |
Research Division: | Earth Sciences |
Research Group: | Geophysics |
Research Field: | Geodesy |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the earth sciences |
UTAS Author: | King, MA (Professor Matt King) |
ID Code: | 122584 |
Year Published: | 2017 |
Funding Support: | Australian Research Council (DP150100615) |
Web of Science® Times Cited: | 17 |
Deposited By: | Geography and Spatial Science |
Deposited On: | 2017-11-20 |
Last Modified: | 2018-05-22 |
Downloads: | 110 View Download Statistics |
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