Antarctic ice volume and contribution to sea-level fall at 20,000 yr BP from raised beaches

Colhoun, Eric A.; Mabin, M. C. G.; Adamson, Donald; Kirk, R. M.

doi:10.1038/358316a0

Cited by 74 publications

(59 citation statements)

References 20 publications

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“…These model studies (Stuiver et al, 1981) are in contrast with some geological evidence, which indicate only limited ice expansion and a sea-level fall of 8 m (Drewry, 1979). Recent data for raised beaches imply either that the ice margins were even thinner and less extensive and that the contribution of ice expansion to the drop in sea level was only 0.2-2.5 m (Colhoun et al, 1992). Drewry (1979) argues that the CLIMAP reconstruction represents only one possible and probably extreme case.…”

Section: Response Of the West And East Antarctic Ice Sheets To Sea-lecontrasting

confidence: 39%

Late Quaternary record of sea-level changes in the Antarctic

1993

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The Late Quaternary sediment sequence of the continental margin in the eastern Weddell Sea is well suited for palaeoenvironmental reconstructions. Two cores from the upper slope, which contain the sedimentary record of the last 300 ky, have been sedimentologically investigated. Age models are based on lithostratigraphy and are correlated with the stable isotope record. As a result of a detailed analysis of the clay mineral composition, grain size distributions and structures, this sedimentary record provides the first marine evidence that the Antarctic ice sheet extended to the shelf edge during the last glacial.The variations in volume and size of the ice sheet were also simulated in numerical models. Changes in accumulation rate and ice temperature are of some importance, but the model revealed that fluctuations are primarily driven by changes in eustatic sea-level and that the ice edge extended to the shelf edge during the last glacial maximum. This causal relationship implies that the maximum ice extension strongly depends on the magnitude and duration of the sea-level depression during a glacial period. The results of the sedimentological investigations and of the numerical models show that the Antarctic ice sheet follows glacial events in the northern hemisphere by teleconnections of sea level.

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Section: Response Of the West And East Antarctic Ice Sheets To Sea-lecontrasting

confidence: 39%

Late Quaternary record of sea-level changes in the Antarctic

1993

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“…The main controversy is whether or not the dominant Antarctic melt contribution to sea level rise is relatively young, perhaps related to Hypsithermal period warming events during the Holocene (10 -8 to 6 -4 ka), or older, corresponding to the initial collapse phase (21 -14 ka) of Northern Hemispheric ice sheets (Peltier, 1998). Some glaciologists argue, based on detailed regional chronology preserved in the geological record, that Antarctica contributed very little to the last 21 ka of sea level rise (Colhoun et al, 1992). Another proposal is that the contribution was early on in global deglaciation, giving the mantle 10,000 years, or more, to re-establish gravitational equilibrium and slow vertical crustal motions to below a detectable level (Clapperton and Sugden, 1982).…”

Section: Postglacial Reboundmentioning

confidence: 98%

GPS evidence for a coherent Antarctic plate and for postglacial rebound in Marie Byrd Land

Donnellan¹,

Luyendyk²

2004

Global and Planetary Change

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“…The extent of these grounding-line advances has been debated, resulting in considerable variation in estimates of the overall Antarctic contribution to eustatic sea-level drop at the last glacial maximum (LGM) (Drewry, 1979;Stuiver et al, 1981;Denton et al, 1989;Huybrechts, 1990;Colhoun et al, 1992;Bentley, 1999;Denton and Hughes, 2002). Even less is known about the occurrence, extent, and timing of previous Ross Sea glaciations.…”

Section: Introductionmentioning

confidence: 97%