globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.05.033
Scopus记录号: 2-s2.0-84982833764
论文题名:
Quaternary evolution and ice sheet history of contrasting landscapes in Uummannaq and Sukkertoppen, western Greenland
作者: Beel C.R.; Lifton N.A.; Briner J.P.; Goehring B.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 149
起始页码: 248
结束页码: 258
语种: 英语
英文关键词: Cosmogenic nuclides ; Greenland Ice Sheet ; Landscape evolution ; Quaternary ; West Greenland
Scopus关键词: Glacial geology ; Glaciers ; Isotopes ; Cosmogenic nuclides ; Greenland Ice Sheet ; Landscape evolutions ; Quaternary ; West Greenland ; Ice ; aluminum ; beryllium isotope ; cosmogenic radionuclide ; drawdown ; glaciation ; ice sheet ; landscape evolution ; Last Glacial Maximum ; Quaternary ; rock ; vegetation ; Arctic ; Arctic Ocean ; Baffin Bay [Arctic Ocean] ; Greenland ; Greenland Ice Sheet
英文摘要: Constraining the history of the Greenland Ice Sheet (GIS) is important for improving our understanding of ice sheet dynamics and landscape evolution processes. We analyzed in situ cosmogenic 10Be and 26Al in 26 rock samples from two high-elevation landscapes adjacent to the GIS, minimally eroded by past glaciations and of differing character in Uummannaq (n = 16) and Sukkertoppen (n = 10), western Greenland. The Uummannaq region is characterized by a marine embayment with islands and peninsulas, where the margin of the GIS is marine-based, whereas the Sukkertoppen landscape resides within the wide terrestrial fringe outboard of the land-terminating portion of the southwestern GIS margin. We targeted landscapes for sampling with highly weathered surfaces adjacent to cold-based portions of extant ice caps (indicated by preservation of fragile, dead vegetation emerging from beneath retreating ice margins). Paired isotope results require differing surface histories between the two areas. Many surfaces in the Uummannaq region have minimum exposure durations up to ca. 300 kyr, but with no significant burial. Most surfaces in the Sukkertoppen region, however, yield complex exposure histories with minimum cumulative exposure durations up to ca. 100 kyr and minimum cumulative burial durations up to ca. 400 kyr, yielding minimum total surface histories of up to 500 ka. These findings suggest that parts of the Uummannaq landscape may have been continuously exposed throughout much of the middle and late Quaternary. On the other hand, the high-altitude surfaces in the Sukkertoppen region were largely preserved beneath minimally-erosive, cold-based ice during the same period. Data from the Uummannaq region thus stand in contrast not only to the Sukkertoppen region, but also to other sites surrounding Baffin Bay reported in previous studies. We hypothesize that surfaces in the Uummannaq region may have remained as nunataks above the Last Glacial Maximum (LGM) ice sheet surface, as well as prior glacial maxima, due to significant ice surface drawdown by the Uummannaq Ice Stream System (UISS). © 2016
资助项目: This research was supported by a Purdue Rare Isotope Measurement Laboratory (PRIME Lab) seed grant and a Purdue Climate Change Research Center (PCCRC) Lynn Fellowship to C. Beel. This research was also supported by a National Science Foundation (NSF) grant ARC-1204096 to N. Lifton and ARC-1204005 to J. Briner. We would like to thank Gifford Miller, Ole Bennike, Avy Schweinsberg, Sam Kelley, Alia Lesnek, Christina Ciarametaro and Sandra Cronauer for assistance in the field, and to CH2M Hill Polar Services for logistical support on Greenland.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59470
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: Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN, United States; Department of Physics and Astronomy, Purdue University, 525 Northwestern Ave., West Lafayette, IN, United States; Department of Geology, State University of New York at Buffalo, Buffalo, NY, United States; Department of Earth and Environmental Sciences, Tulane University, 101 Blessey Hall, New Orleans, LA, United States

Recommended Citation:
Beel C.R.,Lifton N.A.,Briner J.P.,et al. Quaternary evolution and ice sheet history of contrasting landscapes in Uummannaq and Sukkertoppen, western Greenland[J]. Quaternary Science Reviews,2016-01-01,149
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Beel C.R.]'s Articles
[Lifton N.A.]'s Articles
[Briner J.P.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Beel C.R.]'s Articles
[Lifton N.A.]'s Articles
[Briner J.P.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Beel C.R.]‘s Articles
[Lifton N.A.]‘s Articles
[Briner J.P.]‘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.