气候变化领域集成服务门户(CCPortal): Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum

CCPortal

DOI	10.1016/j.quascirev.2018.12.028
	Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum
	Hoffmann S.S.; Dalsing R.E.; Murphy S.C.
发表日期	2019
ISSN	0277-3791
起始页码	99
结束页码	110
卷号	206
英文摘要	The Labrador Sea is a vital region for the Atlantic Meridional Overturning Circulation (AMOC), where overflow waters from the Nordic Seas mix with locally produced Labrador Sea Water (LSW), before exiting to the interior of the Atlantic Ocean. The dynamical sedimentary proxy of mean sortable silt size (SS¯) can give information on past changes in deep water circulation speed and the strength of AMOC. We have produced SS¯ records from two core sites at depths between 1500 and 2000 m on the continental slope east of Newfoundland, to reconstruct changes in intermediate depth water circulation speed, including Glacial North Atlantic Intermediate Water and Labrador Sea Water over the past 22,000 years. Increases in SS¯ appear to coincide with much of the deglaciation as well as the mid-late Holocene. End-member modeling suggests that ice-rafted debris (IRD) is an important factor in interpreting SS¯ during the deglaciation. We find that a robust increase in SS¯ is likely unrelated to IRD during the past 5 ka, and probably reflects increased flow at intermediate depths due to local production of LSW strengthening as Nordic Seas overflows weakened at this depth. Our results highlight both the complications of producing SS¯ records in IRD-rich, slope environments and the promise that this proxy nevertheless has for reconstructing dynamical changes in deep ocean currents. © 2019 Elsevier Ltd
英文关键词	Holocene; Labrador Sea; Paleoceanography; Sedimentology-marine cores
语种	英语
scopus关键词	Glacial geology; Ocean currents; Sedimentology; Silt; Atlantic meridional overturning circulations; Holocenes; Intermediate depth waters; Labrador Sea; Labrador sea waters; Last Glacial Maximum; Marine cores; Paleoceanography; Seawater; continental slope; deep water; deglaciation; Holocene; ice-rafted debris; Last Glacial Maximum; marine environment; meridional circulation; oceanic current; paleoceanography; seawater; sediment core; sedimentation; Arctic Ocean; Atlantic Ocean; Atlantic Ocean (North); Canada; Labrador Sea; Newfoundland; Newfoundland and Labrador; Norwegian Sea
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/152020
作者单位	Department of Earth and Ocean Sciences, University of North Carolina Wilmington, United States
推荐引用方式 GB/T 7714	Hoffmann S.S.,Dalsing R.E.,Murphy S.C.. Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum[J],2019,206.
APA	Hoffmann S.S.,Dalsing R.E.,&Murphy S.C..(2019).Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum.Quaternary Science Reviews,206.
MLA	Hoffmann S.S.,et al."Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum".Quaternary Science Reviews 206(2019).