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A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum

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Abstract
A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse la. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorities for future work. The synthesis is intended to be a resource for the modelling and glacial geological community.
Keywords
Glacial geology, Antarctic Ice Sheet, Modelling, Quaternary, WEDDELL SEA EMBAYMENT, ISOSTATIC-ADJUSTMENT, STREAM STABILITY, MASS-BALANCE, LEVEL CHANGE, RETREAT, CONSTRAINTS, HISTORY, PENINSULA, COLLAPSE

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Chicago
Bentley, Michael J, Colm Ó Cofaigh, John B Anderson, Howard Conway, Bethan Davies, Alastair GC Graham, Claus-Dieter Hillenbrand, et al. 2014. “A Community-based Geological Reconstruction of Antarctic Ice Sheet Deglaciation Since the Last Glacial Maximum.” Quaternary Science Reviews 100: 1–9.
APA
Bentley, M. J., Cofaigh, C. Ó., Anderson, J. B., Conway, H., Davies, B., Graham, A. G., Hillenbrand, C.-D., et al. (2014). A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum. QUATERNARY SCIENCE REVIEWS, 100, 1–9.
Vancouver
1.
Bentley MJ, Cofaigh CÓ, Anderson JB, Conway H, Davies B, Graham AG, et al. A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum. QUATERNARY SCIENCE REVIEWS. 2014;100:1–9.
MLA
Bentley, Michael J, Colm Ó Cofaigh, John B Anderson, et al. “A Community-based Geological Reconstruction of Antarctic Ice Sheet Deglaciation Since the Last Glacial Maximum.” QUATERNARY SCIENCE REVIEWS 100 (2014): 1–9. Print.
@article{5767238,
  abstract     = {A robust understanding of Antarctic Ice Sheet deglacial history since the Last Glacial Maximum is important in order to constrain ice sheet and glacial-isostatic adjustment models, and to explore the forcing mechanisms responsible for ice sheet retreat. Such understanding can be derived from a broad range of geological and glaciological datasets and recent decades have seen an upsurge in such data gathering around the continent and Sub-Antarctic islands. Here, we report a new synthesis of those datasets, based on an accompanying series of reviews of the geological data, organised by sector. We present a series of timeslice maps for 20 ka, 15 ka, 10 ka and 5 ka, including grounding line position and ice sheet thickness changes, along with a clear assessment of levels of confidence. The reconstruction shows that the Antarctic Ice sheet did not everywhere reach the continental shelf edge at its maximum, that initial retreat was asynchronous, and that the spatial pattern of deglaciation was highly variable, particularly on the inner shelf. The deglacial reconstruction is consistent with a moderate overall excess ice volume and with a relatively small Antarctic contribution to meltwater pulse la. We discuss key areas of uncertainty both around the continent and by time interval, and we highlight potential priorities for future work. The synthesis is intended to be a resource for the modelling and glacial geological community.},
  author       = {Bentley, Michael J and Cofaigh, Colm {\'O} and Anderson, John B and Conway, Howard and Davies, Bethan and Graham, Alastair GC and Hillenbrand, Claus-Dieter and Hodgson, Dominic A and Jamieson, Stewart SR and Larter, Robert D and Mackintosh, Andrew and Smith, James A and Verleyen, Elie and Ackert, Robert P and Bart, Philip J and Berg, Sonja and Brunstein, Daniel and Canals, Miguel and Colhoun, Eric A and Crosta, Xavier and Dickens, William A and Domack, Eugene and Dowdeswell, Julian A and Dunbar, Robert and Ehrmann, Werner and Evans, Jeffrey and Favier, Vincent and Fink, David and Fogwill, Christopher J and Glasser, Neil F and Gohl, Karsten and Golledge, Nicholas R and Goodwin, Ian and Gore, Damian B and Greenwood, Sarah L and Hall, Brenda L and Hall, Kevin and Hedding, David W and Hein, Andrew S and Hocking, Emma P and Jakobsson, Martin and Johnson, Joanne S and Jomelli, Vincent and Jones, R Selwyn and Klages, Johann P and Kristoffersen, Yngve and Kuhn, Gerhard and Leventer, Amy and Licht, Kathy and Lilly, Katherine and Lindow, Julia and Livingstone, Stephen J and Mass{\'e}, Guillaume and McGlone, Matt S and McKay, Robert M and Melles, Martin and Miura, Hideki and Mulvaney, Robert and Nel, Werner and Nitsche, Frank O and O'Brien, Philip E and Post, Alexandra L and Roberts, Stephen J and Saunders, Krystyna M and Selkirk, Patricia M and Simms, Alexander R and Spiegel, Cornelia and Stolldorf, Travis D and Sugden, David E and van der Putten, Nathalie and van Ommen, Tas and Verfaillie, Deborah and Vyverman, Wim and Wagner, Bernd and White, Duanne A and Witus, Alexandra E and Zwartz, Dan},
  issn         = {0277-3791},
  journal      = {QUATERNARY SCIENCE REVIEWS},
  keyword      = {Glacial geology,Antarctic Ice Sheet,Modelling,Quaternary,WEDDELL SEA EMBAYMENT,ISOSTATIC-ADJUSTMENT,STREAM STABILITY,MASS-BALANCE,LEVEL CHANGE,RETREAT,CONSTRAINTS,HISTORY,PENINSULA,COLLAPSE},
  language     = {eng},
  pages        = {1--9},
  title        = {A community-based geological reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum},
  url          = {http://dx.doi.org/10.1016/j.quascirev.2014.06.025},
  volume       = {100},
  year         = {2014},
}

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