globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.08.021
Scopus记录号: 2-s2.0-84992144101
论文题名:
Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3) – New evidence from Rauer Group
作者: Berg S.; White D.A.; Bennike O.; Fülöp R.-H.; Fink D.; Wagner B.; Melles M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 153
起始页码: 1
结束页码: 10
语种: 英语
英文关键词: Antarctica ; Exposure dating ; Ice sheet reconstructions ; Lake sediments
Scopus关键词: Climate change ; Coastal zones ; Glacial geology ; Glaciers ; Isotopes ; Lakes ; Sea level ; Sediments ; Submarine geology ; Antarctica ; East antarctic ice sheets ; Exposure dating ; Ice sheet reconstruction ; Lake sediments ; Lake-sediment records ; Marine isotope stages ; Outer continental shelves ; Ice ; coastal zone ; continental shelf ; deglaciation ; geometry ; glaciation ; Holocene ; ice retreat ; lacustrine deposit ; Last Glacial Maximum ; marine isotope stage ; reconstruction ; sea level change ; Antarctic Ice Sheet ; Antarctica ; East Antarctic Ice Sheet ; East Antarctica ; Prydz Bay ; Rauer Islands
英文摘要: Limited information on the East Antarctic Ice Sheet (EAIS) geometry during Marine Isotope Stage 3 (MIS 3; 60-25 ka) restricts our understanding of its behaviour during periods of climate and sea level change. Ice sheet models forced by global parameters suggest an expanded EAIS compared to the Holocene during MIS 3, but field evidence from East Antarctic coastal areas contradicts such modelling, and suggests that the ice sheet margins were no more advanced than at present. Here we present a new lake sediment record, and cosmogenic exposure results from bedrock, which confirm that Rauer Group (eastern Prydz Bay) was ice-free for much of MIS 3. We also refine the likely duration of the Last Glacial Maximum (LGM) glaciation in the region. Lacustrine and marine sediments from Rauer Group indicate the penultimate period of ice retreat predates 50 ka. The lacustrine record indicates a change from warmer/wetter conditions to cooler/drier conditions after ca. 35 ka. Substantive ice sheet re-advance, however, may not have occurred until much closer to 20 ka. Contemporary coastal areas were still connected to the sea during MIS 3, restricting the possible extent of grounded ice in Prydz Bay on the continental shelf. In contrast, relative sea levels (RSL) deduced from field evidence indicate an extra ice load averaging several hundred metres thicker ice across the Bay between 45 and 32 ka. Thus, ice must either have been thicker immediately inland (with a steeper ice profile), or there were additional ice domes on the shallow banks of the outer continental shelf. Further work is required to reconcile the differences between empirical evidence of past ice sheet histories, and the history predicted by ice sheet models from far-field temperature and sea level records. © 2016 Elsevier Ltd
资助项目: The project is funded by the German Research Foundation within the Priority Program (SPP) 1158 (DFG Schwerpunktprogramm, grants ME1169/15-1 and WA 2109/2-1). Cosmogenic dating was supported by the Australian Institute of Nuclear Science and Engineering (AINGRA08069). Charles Mifsud, Tim Keighley and Kat Brougham assisted sample processing. DW and SB have been supported by grants from the Universities Australia-DAAD Joint Research Cooperation Scheme.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59391
Appears in Collections:过去全球变化的重建

Files in This Item:

There are no files associated with this item.


作者单位: Institute of Geology and Mineralogy, University of Cologne, Cologne, Germany; Institute for Applied Ecology, University of CanberraACT, Australia; Geological Survey of Denmark and Greenland, Copenhagen, Denmark; Australian Nuclear Science and Technology Organisation (ANSTO), Lucas HeightsNSW, Australia; Australia and School of Earth and Environmental Science, University of Wollongong, Wollongong, NSW, Australia

Recommended Citation:
Berg S.,White D.A.,Bennike O.,et al. Unglaciated areas in East Antarctica during the Last Glacial (Marine Isotope Stage 3) – New evidence from Rauer Group[J]. Quaternary Science Reviews,2016-01-01,153
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Berg S.]'s Articles
[White D.A.]'s Articles
[Bennike O.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Berg S.]'s Articles
[White D.A.]'s Articles
[Bennike O.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Berg S.]‘s Articles
[White D.A.]‘s Articles
[Bennike O.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.