DOI: 10.1016/j.quascirev.2016.06.013
Scopus记录号: 2-s2.0-84988942994
论文题名: Relative sea-level data from southwest Scotland constrain meltwater-driven sea-level jumps prior to the 8.2 kyr BP event
作者: Lawrence T. ; Long A.J. ; Gehrels W.R. ; Jackson L.P. ; Smith D.E.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 151 起始页码: 292
结束页码: 308
语种: 英语
英文关键词: 8.2 ka event
; Early Holocene
; Ice-sheet
; Lake drainage
; Scotland
; Sea level
Scopus关键词: Climate change
; Climate models
; Glaciers
; Ice
; Lakes
; Oceanography
; Water
; 8.2 ka event
; Atlantic meridional overturning circulations
; Critical constraints
; Early Holocene
; Ice sheet
; Laurentide ice sheets
; Melt-water discharges
; Scotland
; Sea level
; cooling
; estuarine sediment
; freshwater input
; Holocene
; lacustrine environment
; Laurentide Ice Sheet
; meltwater
; meridional circulation
; proxy climate record
; sea level change
; Atlantic Ocean
; Atlantic Ocean (North)
; Scotland
; United Kingdom
英文摘要: The most significant climate cooling of the Holocene is centred on 8.2 kyr BP (the ‘8.2 event’). Its cause is widely attributed to an abrupt slowdown of the Atlantic Meridional Overturning Circulation (AMOC) associated with the sudden drainage of Laurentide proglacial Lakes Agassiz and Ojibway, but model simulations have difficulty reproducing the event with a single-pulse scenario of freshwater input. Several lines of evidence point to multiple episodes of freshwater release from the decaying Laurentide Ice Sheet (LIS) between ∼8900 and ∼8200 cal yr BP, yet the precise number, timing and magnitude of these events – critical constraints for AMOC simulations – are far from resolved. Here we present a high-resolution relative sea level (RSL) record for the period 8800 to 7800 cal yr BP developed from estuarine and salt-marsh deposits in SW Scotland. We find that RSL rose abruptly in three steps by 0.35 m, 0.7 m and 0.4 m (mean) at 8760–8640, 8595–8465, 8323–8218 cal yr BP respectively. The timing of these RSL steps correlate closely with short-lived events expressed in North Atlantic proxy climate and oceanographic records, providing evidence of at least three distinct episodes of enhanced meltwater discharge from the decaying LIS prior to the 8.2 event. Our observations can be used to test the fidelity of both climate and ice-sheet models in simulating abrupt change during the early Holocene. © 2016 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59430
Appears in Collections: 过去全球变化的重建
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作者单位: Dept. of Geography, Lower Mountjoy, Durham University, South Road, Durham, United Kingdom; Environment Dept., University of York, Heslington, York, United Kingdom; Programme for Economic Modelling, Nuffield College, 1 New Road, United Kingdom; School of Geography, University of Oxford, South Parks Road, Oxford, United Kingdom
Recommended Citation:
Lawrence T.,Long A.J.,Gehrels W.R.,et al. Relative sea-level data from southwest Scotland constrain meltwater-driven sea-level jumps prior to the 8.2 kyr BP event[J]. Quaternary Science Reviews,2016-01-01,151