HR: 0800h
AN: G41A-0340    [Abstracts]
TI: The tide gauge record from the eastern US as a potential indicator of Greenland ice sheet mass balance
AU: * Wake, L M
EM: l.m.wake@dur.ac.uk
AF: Department of Earth Sciences, University of Durham Science Labs, Durham, DH1 3LE United Kingdom
AU: Milne, G
EM: g.a.milne@dur.ac.uk
AF: Department of Earth Sciences, University of Durham Science Labs, Durham, DH1 3LE United Kingdom
AU: Leuliette, E
EM: Eric.Leuliette@colorado.edu
AF: Colorado Center for Astrodynamics Research, 431 UCB, Boulder, CO 80309-0431 United States
AB: Tide gauge data from the US east coast display a distinct spatial variation. Previous studies [e.g. Davis & Mitrovica, Nature 379, 331, 1996] have shown that a dominant component of this variation can be explained by the ongoing deformation of this region in response to the most recent deglaciation of North American ice sheets. As a consequence, the observations have been employed to constrain models of glacial isostatic adjustment (GIA). Other recent studies indicate that there might be a significant contribution to the observed sea-level changes from either or both of Greenland mass balance [Tamiseia et al., J. Geophys. Res. 106, 30, 849, 2001] and ocean steric effects [Miller & Douglas, Nature 428, 406, 2004]. In this paper we consider the sea-level contribution from these additional processes in order to determine: (1) whether the tide gauge data can be employed to set useful constraints on recent (past ~50 yr and longer) Greenland ice sheet mass balance; and (2) whether previous GIA parameter estimates derived using models that did not include these non-isostatic processes are significantly biased.
DE: 1218 Mass balance (0762, 1223, 1631, 1836, 1843, 3010, 3322, 4532)
DE: 1223 Ocean/Earth/atmosphere/hydrosphere/cryosphere interactions (0762, 1218, 3319, 4550)
DE: 1295 Integrations of techniques
DE: 1622 Earth system modeling (1225)
SC: Geodesy [G]
MN: Fall Meeting 2005