20th Century sea-level change along the eastern US: unravelling the contributions from steric changes, Greenland ice sheet mass balance and Late Pleistocene glacial loading

Wake, Leanne, Milne, Glenn and Leuliette, Eric (2006) 20th Century sea-level change along the eastern US: unravelling the contributions from steric changes, Greenland ice sheet mass balance and Late Pleistocene glacial loading. Earth and Planetary Science Letters, 250 (3-4). pp. 572-580. ISSN 0012-821X

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Abstract

We have considered the influence of ocean temperature and salinity changes, mass changes of the Greenland ice sheet (GIS) and the isostatic response of the solid earth to the most recent glacial cycle on 20th century sea-level change along the US east coast with the intention of better understanding the observed signal as well as determining the potential of the tide gauge data for constraining the recent (past 50–100 yr) mass balance of the GIS and earth viscosity structure. Our results show that the signal due to steric changes is large and displays a complex spatial variation which can account for a significant portion of the observed signal. In contrast, that due to changes in the GIS is relatively small and insensitive to the specific geometry of the mass balance model adopted. As a consequence, the tide gauge data alone are not capable of providing useful constraints on either the magnitude or form of recent GIS mass balance. Our inference of mantle viscosity structure based on the tide gauge data was affected dramatically when the steric effect was accounted for: An earth model with an upper mantle viscosity of 8 × 1019 Pa s and a lower mantle viscosity of 5 × 1022 Pa s produced the best fit to the steric-corrected data; the optimal fit to the uncorrected data was obtained for upper and lower mantle viscosities of 5 × 1020 Pa s and 1022 Pa s, respectively.

Item Type:	Article
Uncontrolled Keywords:	sea-level change, tide gauges, mantle viscosity
Subjects:	F700 Ocean Sciences F800 Physical and Terrestrial Geographical and Environmental Sciences F900 Others in Physical Sciences
Department:	Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User:	Leanne Wake
Date Deposited:	03 Jul 2013 13:49
Last Modified:	13 Oct 2019 00:23
URI:	http://nrl.northumbria.ac.uk/id/eprint/13158

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