DOI: 10.1016/j.quascirev.2018.12.028
Scopus记录号: 2-s2.0-85060106896
论文题名: Sortable silt records of intermediate-depth circulation and sedimentation in the Southwest Labrador Sea since the Last Glacial Maximum
作者: Hoffmann S.S. ; Dalsing R.E. ; Murphy S.C.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 206 起始页码: 99
结束页码: 110
语种: 英语
英文关键词: Holocene
; Labrador Sea
; Paleoceanography
; Sedimentology-marine cores
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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117382
Appears in Collections: 气候变化与战略
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Recommended Citation:
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]. Quaternary Science Reviews,2019-01-01,206