Arid
DOI10.1098/rsta.2006.1791
Geological and geomorphological insights into Antarctic ice sheet evolution
Sugden, David E.; Bentley, Michael J.; O Cofaigh, Colm
通讯作者Sugden, David E.
会议名称Royal-Society Discussion Meeting on Evolution of the Antarctic Ice Sheet
会议日期OCT 17-18, 2005
会议地点London, ENGLAND
英文摘要

Technical advances in the study of ice-free parts of Antarctica can provide quantitative records that are useful for constraining and refining models of ice sheet evolution and behaviour. Such records improve our understanding of system trajectory, influence the questions we ask about system stability and help to define the ice-sheet processes that are relevant on different time-scales. Here, we illustrate the contribution of cosmogenic isotope analysis of exposed bedrock surfaces and marine geophysical surveying to the understanding of Antarctic ice sheet evolution on a range of time-scales. In the Dry Valleys of East Antarctica, 3 He dating of subglacial flood deposits that are now exposed on mountain summits provide evidence of an expanded and thicker Mid-Miocene ice sheet. The survival of surface boulders for approximately 14 Myr, the oldest yet measured, demonstrates exceptionally low rates of subsequent erosion and points to the persistence and stability of the dry polar desert climate since that time. Increasingly, there are constraints on West Antarctic ice sheet fluctuations during Quaternary glacial cycles. In the Sarnoff Mountains of Marie Byrd Land in West Antarctica, Be-10 and Al-26 cosmogenic isotope analysis of glacial erratics and bedrock reveal steady thinning of the ice sheet from 10 400 years ago to the present, probably as a result of grounding line retreat. In the Antarctic Peninsula, offshore analysis reveals an extensive ice sheet at the last glacial maximum. Based on radiocarbon dating, deglaciation began by 17 000 cal. yr BP and was complete by 9500 cal yr BP. Deglaciation of the west and east sides of the Antarctic Peninsula ice sheet occurred at different times and rates, but was largely complete by the Early Holocene. At that time ice shelves were less extensive on the west side of the Antarctic Peninsula than they are today. The message from the past is that individual glacier drainage basins in Antarctica respond in different and distinctive ways to global climate change, depending on the link between regional topography and climate setting.


英文关键词Antarctic ice sheet glacial history cosmogenic isotopes Quaternary marine geology
来源出版物PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
ISSN1364-503X
EISSN1471-2962
出版年2006
卷号364
期号1844
页码1607-1625
出版者ROYAL SOC
类型Article;Proceedings Paper
语种英语
国家Scotland;England
收录类别SCI-E ; CPCI-S
WOS记录号WOS:000238944500003
WOS关键词LAST GLACIAL MAXIMUM ; SUBSEQUENT RETREAT HISTORY ; SEA-FLOOR EVIDENCE ; MARIE-BYRD-LAND ; TRANSANTARCTIC MOUNTAINS ; WEST ANTARCTICA ; COSMOGENIC NUCLIDES ; HOLOCENE RETREAT ; VICTORIA LAND ; WEDDELL SEA
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
资源类型会议论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/296120
作者单位(1)Univ Edinburgh, Sch Geosci, Inst Geog, Edinburgh EH9 3JW, Midlothian, Scotland;(2)Univ Durham, Dept Geog, Durham DH1 3LE, England
推荐引用方式
GB/T 7714
Sugden, David E.,Bentley, Michael J.,O Cofaigh, Colm. Geological and geomorphological insights into Antarctic ice sheet evolution[C]:ROYAL SOC,2006:1607-1625.
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