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

Frederikse, T, Riva, REM and King, MA ORCID: 0000-0001-5611-9498 2017 , 'Ocean bottom deformation due to present-day mass redistribution and its impact on sea level observations' , Geophysical Research Letters, vol. 44, no. 24 , pp. 12306-12314 , doi:

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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 Type: Article
Authors/Creators:Frederikse, T and Riva, REM and King, MA
Keywords: vertical land movement, ice melt, sea level, altimetry, tide gauges
Journal or Publication Title: Geophysical Research Letters
Publisher: Amer Geophysical Union
ISSN: 0094-8276
DOI / ID Number:
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Copyright 2017 The Authors. Licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

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