Provenance of LGM glacial till (sand fraction) across the Ross embayment, Antarctica

Licht, Kathy J.; Lederer, J. R.; Swope, R. Jeffrey

doi:10.1016/j.quascirev.2004.10.017

Cited by 88 publications

(131 citation statements)

References 31 publications

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“…Throughout the domain, modeled flowlines agree closely, but not perfectly, with LGM flow directions inferred from orientations of mega-scale glacial lineations (20,24,25) and from marine sediment core mineral provenance studies (26) (Fig. 2 and SI Appendix, Fig.…”

Section: Resultsmentioning

confidence: 55%

Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing

Golledge

Fogwill

Mackintosh

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

138

143

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Retreat of the Last Glacial Maximum (LGM) Antarctic ice sheet is thought to have been initiated by changes in ocean heat and eustatic sea level propagated from the Northern Hemisphere (NH) as northern ice sheets melted under rising atmospheric temperatures. The extent to which spatial variability in ice dynamics may have modulated the resultant pattern and timing of decay of the Antarctic ice sheet has so far received little attention, however, despite the growing recognition that dynamic effects account for a sizeable proportion of mass-balance changes observed in modern ice sheets. Here we use a 5-km resolution whole-continent numerical ice-sheet model to assess whether differences in the mechanisms governing ice sheet flow could account for discrepancies between geochronological studies in different parts of the continent. We first simulate the geometry and flow characteristics of an equilibrium LGM ice sheet, using pan-Antarctic terrestrial and marine geological data for constraint, then perturb the system with sea level and ocean heat flux increases to investigate ice-sheet vulnerability. Our results identify that fast-flowing glaciers in the eastern Weddell Sea, the Amundsen Sea, central Ross Sea, and in the Amery Trough respond most rapidly to ocean forcings, in agreement with empirical data. Most significantly, we find that although ocean warming and sea-level rise bring about mainly localized glacier acceleration, concomitant drawdown of ice from neighboring areas leads to widespread thinning of entire glacier catchments—a discovery that has important ramifications for the dynamic changes presently being observed in modern ice sheets.

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Section: Resultsmentioning

confidence: 55%

Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing

Golledge

Fogwill

Mackintosh

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

138

143

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“…Glaciological reconstructions of grounded ice expansion within the Ross Embayment during the Last Glacial Maximum (LGM) (Denton andHughes, 2000, 2002) indicate that the WAIS and EAIS interacted in the past similarly to modern times, but with an approximately equal contribution of East and West Antarctic sourced ice feeding into grounded ice in the Ross Sea area. Previous petrographic studies from the Ross Sea are also suggestive of a relatively equal contribution from each source during the LGM (e.g., Licht et al, 2005).…”

Section: Introductionmentioning

confidence: 84%

“…Interestingly provenance investigations and resulting glacial dynamic models by Licht et al (2005) are in conflict with the Stuiver et al (1981) model, indicating that only the flow lines of Byrd Glacier and northernmost outlet glaciers could reach the McMurdo Sound area during the LGM.…”

Section: Basement Clasts Provenance and Integration With Previous Icementioning

confidence: 94%

“…The results help to constrain significant steps in Antarctic Ice Sheet evolution through the Plio-Miocene, and address key questions regarding 1) the contribution of WAIS and EAIS to the sedimentary record at the SW end of the Ross Embayment in the Pliocene to Middle Miocene time, and 2) the assessment of the implications of AND-1B provenance constraints for glaciological models in comparison with LGM scenarios (e.g., Denton andHughes, 2000, 2002;Denton and Marchant, 2000;Licht et al, 2005), as well as numerical ice sheets models (MacAyeal et al, 1996;Hulbe and MacAyeal, 1999;Ritz et al, 2001;Huybrechts, 2002).…”

Section: Introductionmentioning

confidence: 89%

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Provenance signatures of the Antarctic Ice Sheets in the Ross Embayment during the Late Miocene to Early Pliocene: The ANDRILL AND-1B core record

Talarico

Sandroni

2009

Global and Planetary Change

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“…the M2 glacial in Figure F4) because these events can be traced to more continuous records from the continental rise (proposed primary Sites RSCR-11A and RSCR-02B) and global sea level records (Figure F10). Sediment provenance studies (clast/sand petrology and Nd-, Sr-, and Pb-isotopic analysis) at proposed Sites EBOCS-01D through EBOCS-04B will enable understanding of the changes in the origin of sediments (e.g., local ice caps vs. ice sheet expansion) ( Figure F8) (Cook et al, 2013;Licht et al, 2005). As with all objectives, data integration with modeling studies will be undertaken (cf.…”

Section: Evaluate the Contribution Of West Antarctica To Far-field Icmentioning

confidence: 99%

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McKay¹,

Santis²,

Kulhanek³

2017

International Ocean Discovery Program Scientific Prospectus

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Observations from the past several decades indicate that the Southern Ocean is warming significantly and that Southern Hemisphere westerly winds have migrated southward and strengthened due to increasing atmospheric CO 2 concentrations and/or ozone depletion. These changes have been linked to thinning of Antarctic ice shelves and marine terminating glaciers. Results from geologic drilling on Antarctica's continental margins show late Neogene marine-based ice sheet variability, and numerical models indicate a fundamental role for oceanic heat in controlling this variability over at least the past 20 My. Although evidence for past ice sheet variability has been observed in marginal settings, sedimentological sequences from the outer continental shelf are required to evaluate the extent of past ice sheet variability and the role of oceanic heat flux in controlling ice sheet mass balance.

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Provenance of LGM glacial till (sand fraction) across the Ross embayment, Antarctica

Cited by 88 publications

References 31 publications

Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing

Dynamics of the last glacial maximum Antarctic ice-sheet and its response to ocean forcing

Provenance signatures of the Antarctic Ice Sheets in the Ross Embayment during the Late Miocene to Early Pliocene: The ANDRILL AND-1B core record

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