East Antarctic ice sheet retreat as a response to meltwater pulse 1A

Simple item page
dc.contributor.authorMackintosh, Aen_AU
dc.contributor.authorDomack, Een_AU
dc.contributor.authorLeventer, Aen_AU
dc.contributor.authorWhite, DAen_AU
dc.contributor.authorFink, Den_AU
dc.contributor.authorGore, DBen_AU
dc.contributor.authorDunbar, Ren_AU
dc.date.accessioned2009-10-27T02:53:07Zen_AU
dc.date.accessioned2010-04-30T04:58:00Zen_AU
dc.date.available2009-10-27T02:53:07Zen_AU
dc.date.available2010-04-30T04:58:00Zen_AU
dc.date.issued2008-07en_AU
dc.date.statistics2008-07en_AU
dc.description.abstractWe develop an empirical model of East Antarctic Ice Sheet (EAIS) retreat during the last termination in Mac.Robertson Land. Exposure dating, marine cores and swath bathymetry indicate retreat from the continental shelf and ice sheet drawdown in coastal mountains began ~13 ka. Calving re-entrant bays formed during initial retreat and persisted for 100's years in Iceberg Alley and 10's years at Neilson Basin. Exposure dates in Framnes Mountains within the same drainage basin as Iceberg Alley indicate ~350 m of ice thinning was complete by ~7 ka. EAIS retreat at many sites on the Antarctic perimeter (including these three) immediately post-dated Meltwater Pulse 1A (MWP1A). Rather than being a source of MWP1A, our data support a hypothesis that rapid eustatic sea level rise during this time unhinged the ice-sheet margin from its stability point at the shelf edge. Thereafter, the rate of EAIS retreat depended on trough geometry, akin to the present-day response of fiord glaciers, until retreat ceased when sea level stabilised. Our findings reinforce a concern that marine-based portions of Antarctic Ice Sheets are vulnerable to collapse if sea level rise approaches the rates (~4m/century) achieved during MWP1A, as a consequence of melting ice in Greenland and elsewhere.en_AU
dc.description.sponsorshipScientific Committee on Antarctic Researchen_AU
dc.identifier.citationMackintosh, A., Domack, E., Leventer, A., White, D., Fink, D., & Gore, D., & Dunbar, R. (2008). East Antarctic ice sheet retreat as a response to meltwater pulse 1A. Presentation to the Biennial SCAR Meeting, 5th – 7th July 2008. St Petersburg, Russia: Pribaltiyskaya Hotel.en_AU
dc.identifier.conferenceenddate7 July 2008en_AU
dc.identifier.conferencenameBiennial SCAR Meetingen_AU
dc.identifier.conferenceplaceSt Petersburg, Russiaen_AU
dc.identifier.conferencestartdate5 July 2008en_AU
dc.identifier.govdoc1089en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2091en_AU
dc.language.isoenen_AU
dc.publisherScientific Committee on Antarctic Researchen_AU
dc.subjectAntarctic regionsen_AU
dc.subjectIceen_AU
dc.subjectSheetsen_AU
dc.subjectSea levelen_AU
dc.subjectMeltingen_AU
dc.subjectContinental shelfen_AU
dc.titleEast Antarctic ice sheet retreat as a response to meltwater pulse 1Aen_AU
dc.typeConference Abstracten_AU
Files
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.79 KB
Format:
Plain Text
Description:
Download
Collections
Conference Publications