气候变化领域集成服务门户(CCPortal): Seaward growth of Antarctic continental shelves since establishment of a continent-wide ice sheet: Patterns and mechanisms

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DOI	10.1016/j.palaeo.2019.01.025
	Seaward growth of Antarctic continental shelves since establishment of a continent-wide ice sheet: Patterns and mechanisms
	Hochmuth K.; Gohl K.
发表日期	2019
ISSN	0031-0182
起始页码	44
结束页码	54
卷号	520
英文摘要	The location and setting of the continental shelf break along the Antarctic continental shelves influences the paleoceanographic circulation patterns as well as sedimentation and ice sheet dynamics. By evaluating the available multichannel seismic reflection data and drill core information, we mapped the base of progradational features associated with the first advances of grounded ice sheet to the outer shelf. The distance between the modern shelf edge and the pre-glacial shelf edge varies from >200 km (e.g. Ross Sea) to <6 km (e.g. Thurston Island, West Antarctica). We identified multiple processes and mechanisms which influence the amount of shelf progradation during the establishment of a grounded ice sheet on the outer Antarctic shelves. The tectonic structure of the shelves proves to be a key factor by establishing the width of the shelf as well as local tectonics such as horst/graben and fault systems, which guide the ice stream flow and therefore the resulting sedimentation. Unlike expected, the erosional potential of the hinterland seems to play a minor role in building progradational sequences, whereas fewer long-term grounding events on the shelf edge result in more continental shelf progradation than presumed from a more dynamic ice sheet. By using these observed relationships to extrapolate the former shelf edge to unmapped regions around the Antarctic continent, we estimate an overall seaward growth of the continental shelves by 7% in area and 1.28 ∗ 10 6 km 3 of approximated sedimentary volume deposited along the shelf edge and upper slope. © 2019 Elsevier B.V.
英文关键词	Antarctic continental shelves; Glacial erosion; Glacial sedimentation; Progradational wedges; Seismic reflection data; Southern Ocean
语种	英语
scopus关键词	continental shelf; glacial erosion; glacial sedimentation; grounding line; ice sheet; ice stream; paleoceanography; progradation; sedimentation; seismic data; seismic reflection; shelf break; tectonic structure; tectonic wedge; Antarctica; Ross Sea; Southern Ocean; Southern Ocean; West Antarctica
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151033
作者单位	Alfred Wegener Institute, Helmholtz-Center for Polar and Marine Sciences, Am Alten Hafen 26, Bremerhaven, 27568, Germany
推荐引用方式 GB/T 7714	Hochmuth K.,Gohl K.. Seaward growth of Antarctic continental shelves since establishment of a continent-wide ice sheet: Patterns and mechanisms[J],2019,520.
APA	Hochmuth K.,&Gohl K..(2019).Seaward growth of Antarctic continental shelves since establishment of a continent-wide ice sheet: Patterns and mechanisms.Palaeogeography, Palaeoclimatology, Palaeoecology,520.
MLA	Hochmuth K.,et al."Seaward growth of Antarctic continental shelves since establishment of a continent-wide ice sheet: Patterns and mechanisms".Palaeogeography, Palaeoclimatology, Palaeoecology 520(2019).