气候变化领域集成服务门户(CCPortal): The local last glacial maximum in McMurdo Sound, Antarctica: Implications for ice-sheet behavior in the ross sea embayment

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DOI	10.1130/B35139.1
	The local last glacial maximum in McMurdo Sound, Antarctica: Implications for ice-sheet behavior in the ross sea embayment
	Christ A.J.; Bierman P.R.
发表日期	2020
ISSN	167606
起始页码	31
结束页码	47
卷号	132 期号:2021-01-02
英文摘要	During the Last Glacial Maximum (LGM), a grounded ice sheet filled the Ross Sea Embayment in Antarctica and deposited glacial sediments on volcanic islands and peninsulas in McMurdo Sound and coastal regions of the Transantarctic Mountains. The flow geometry and retreat history of this ice are debated, with contrasting views yielding divergent implications for the interaction between and stability of the East and West Antarctic ice sheets during late Quaternary time. Here, we present terrestrial geomorphologic evidence and reconstruct former ice-marginal environments, ice sheet elevations, and ice-flow directions in McMurdo Sound. Fossil algae in ice-marginal sediments provide a coherent radiocarbon chronology of maximum ice extent and deglaciation. We integrate these data with marine records to reconstruct grounded ice dynamics in Mc-Murdo Sound and the western Ross Sea. The combined data set suggests ice flow toward the Transantarctic Mountains in McMurdo Sound during peak glaciation, with thick, grounded ice at or near its maximum position between 19.6 and 12.3 ka. Persistent grounded ice in McMurdo Sound and across the western Ross Sea after Meltwater Pulse 1a (14.0-14.5 ka) suggests that this sector of Antarctica did not significantly contribute to this rapid sea-level rise event. Our data show no significant advance of locally derived ice from the Transantarctic Mountains into Mc-Murdo Sound during the local LGM. © 2019 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184886
作者单位	Department of Earth and Environment, Boston University, Boston, MA 02215, United States; Department of Geology, University of Vermont, Burlington, VT 05405, United States
推荐引用方式 GB/T 7714	Christ A.J.,Bierman P.R.. The local last glacial maximum in McMurdo Sound, Antarctica: Implications for ice-sheet behavior in the ross sea embayment[J],2020,132(2021-01-02).
APA	Christ A.J.,&Bierman P.R..(2020).The local last glacial maximum in McMurdo Sound, Antarctica: Implications for ice-sheet behavior in the ross sea embayment.Bulletin of the Geological Society of America,132(2021-01-02).
MLA	Christ A.J.,et al."The local last glacial maximum in McMurdo Sound, Antarctica: Implications for ice-sheet behavior in the ross sea embayment".Bulletin of the Geological Society of America 132.2021-01-02(2020).