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Ocean-bottom deformation due to present-day mass redistribution and its impact on sea-level observations


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 pp. 1-19. ISSN 0094-8276 (In Press) [Refereed Article]

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DOI: doi:10.1002/2017GL075419


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
Keywords:vertical land movement, ice melt, sea level, altimetry, tide gauges
Research Division:Engineering
Research Group:Geomatic Engineering
Research Field:Geodesy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:King, MA (Professor Matt King)
ID Code:122584
Year Published:In Press
Funding Support:Australian Research Council (DP150100615)
Deposited By:Geography and Spatial Science
Deposited On:2017-11-20
Last Modified:2017-11-27

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