气候变化领域集成服务门户(CCPortal): Abrupt Holocene ice-sheet thinning along the southern Soya Coast; Lützow-Holm Bay; East Antarctica; revealed by glacial geomorphology and surface exposure dating

CCPortal

DOI	10.1016/j.quascirev.2020.106540
	Abrupt Holocene ice-sheet thinning along the southern Soya Coast; Lützow-Holm Bay; East Antarctica; revealed by glacial geomorphology and surface exposure dating
	Kawamata M.; Suganuma Y.; Doi K.; Misawa K.; Hirabayashi M.; Hattori A.; Sawagaki T.
发表日期	2020
ISSN	0277-3791
卷号	247
英文摘要	Geological reconstruction of the retreat history of the East Antarctic Ice Sheet (EAIS) since the Last Glacial Maximum (LGM) is essential for understanding the response of the ice sheet to global climatic change and the mechanisms of retreat, including a possible abrupt melting event. Such information is key for constraining climatic and ice-sheet models that are used to predict future Antarctic Ice Sheet AIS melting. However, data required to make a detailed reconstruction of the history of the EAIS involving changes in its thickness and lateral extent since the LGM remain sparse. Here, we present a new detailed ice-sheet history for the southern Soya Coast, Lützow-Holm Bay, East Antarctica, based on geomorphological observations and surface exposure ages. Our results demonstrate that the ice sheet completely covered the highest peak of Skarvsnes (400 m a.s.l.) prior to ∼9 ka and retreated eastward by at least 10 km during the Early to Mid-Holocene (ca. 9 to 5 ka). The timing of the abrupt ice-sheet thinning and retreat is consistent with the intrusion of modified Circumpolar Deep Water (mCDW) into deep submarine valleys in Lützow-Holm Bay, as inferred from fossil foraminifera records of marine sediment cores. Thus, we propose that the mechanism of the abrupt thinning and retreat of the EAIS along the southern Soya Coast was marine ice-sheet instability caused by mCDW intrusion into deep submarine valleys. Such abrupt ice-sheet thinning and retreat with similar magnitude and timing have also been reported from Enderby Land, East Antarctica. Our findings suggest that abrupt thinning and retreat as a consequence of marine ice-sheet instability and intrusion of mCDW during the Early to Mid-Holocene may have led to rapid ice-surface lowering of hundreds of meters in East Antarctica. © 2020 The Author(s)
英文关键词	East Antarctic Ice Sheet; Glacial geomorphology; Holocene ice-sheet retreat; Marine ice sheet instability; Surface exposure dating
语种	英语
scopus关键词	Automatic identification; Glacial geology; Glaciers; Melting; Submarine geology; Submarines; Antarctic ice sheets; East antarctic ice sheets; Glacial geomorphology; Global climatic changes; Last Glacial Maximum; Modified circumpolar deep waters; Surface exposure age; Surface exposure dating; Ice; climate change; dating method; deep water; fossil record; geomorphological response; geomorphology; global climate; Holocene; ice retreat; ice sheet; ice thickness; Last Glacial Maximum; Antarctic Ice Sheet; Antarctica; East Antarctic Ice Sheet; East Antarctica; Enderby Land; Holmes Bay; Maine; Soya Coast; United States; Foraminifera
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151307
作者单位	Department of Polar Science, School of Multidisciplinary Sciences, The Graduate University for Advanced Studies (SOKENDAI), Japan; National Institute of Polar Research, Tokyo, Japan; Faculty of Social Sciences, Hosei University, Tokyo, Japan
推荐引用方式 GB/T 7714	Kawamata M.,Suganuma Y.,Doi K.,et al. Abrupt Holocene ice-sheet thinning along the southern Soya Coast; Lützow-Holm Bay; East Antarctica; revealed by glacial geomorphology and surface exposure dating[J],2020,247.
APA	Kawamata M..,Suganuma Y..,Doi K..,Misawa K..,Hirabayashi M..,...&Sawagaki T..(2020).Abrupt Holocene ice-sheet thinning along the southern Soya Coast; Lützow-Holm Bay; East Antarctica; revealed by glacial geomorphology and surface exposure dating.Quaternary Science Reviews,247.
MLA	Kawamata M.,et al."Abrupt Holocene ice-sheet thinning along the southern Soya Coast; Lützow-Holm Bay; East Antarctica; revealed by glacial geomorphology and surface exposure dating".Quaternary Science Reviews 247(2020).