Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1098/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. |
来源期刊 | PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
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ISSN | 1364-503X |
EISSN | 1471-2962 |
出版年 | 2006 |
卷号 | 364期号:1844页码:1607-1625 |
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 |
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 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/152710 |
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[J],2006,364(1844):1607-1625. |
APA | Sugden, David E.,Bentley, Michael J.,&O Cofaigh, Colm.(2006).Geological and geomorphological insights into Antarctic ice sheet evolution.PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES,364(1844),1607-1625. |
MLA | Sugden, David E.,et al."Geological and geomorphological insights into Antarctic ice sheet evolution".PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES 364.1844(2006):1607-1625. |
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