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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, L.M.; Milne, G.A.; Leuliette, E.


L.M. Wake

G.A. Milne

E. Leuliette


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.

Journal Article Type Article
Publication Date Oct 1, 2006
Deposit Date Feb 25, 2009
Journal Earth and Planetary Science Letters
Print ISSN 0012-821X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 250
Issue 3-4
Pages 572-580
Keywords Sea-level change, Tide gauges, Greenland ice sheet, Mantle viscosity.
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