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DOI	10.1016/j.quascirev.2020.106641
	Abrupt last glacial dust fall over southeast England associated with dynamics of the British-Irish ice sheet
	Stevens T.; Sechi D.; Bradák B.; Orbe R.; Baykal Y.; Cossu G.; Tziavaras C.; Andreucci S.; Pascucci V.
发表日期	2020
ISSN	0277-3791
卷号	250
英文摘要	Loess deposits in southern Britain contain a record of dust, climate and landscape dynamics over the last glacial, yet their age and accumulation rate remain poorly known. Furthermore, the environmental controls on the loess-soil stratigraphy shown in the thickest deposits in southeast England are still debated. Here we apply the first high sampling resolution quartz optically stimulated luminescence study of dust accumulation and loess formation in Britain at the Pegwell Bay site in east Kent. We couple this to mineral magnetic, particle size and geochemical analyses to understand climate, environment and post depositional modification of the loess. The luminescence ages and Bayesian age modelling results suggest two phases of greatly enhanced dust accumulation at the site. Loess began to accumulate around c. 25–23.5 ka, coinciding with Heinrich event 2, and after subsequent lower accumulation rates, a second enhanced phase of deposition occurred at around 20–19 ka. We propose a model where the dynamics of the British-Irish and Fennoscandian Ice Sheets, associated glacial lake drainage, and linked reorganisations of atmospheric circulation, all controlled loess accumulation in southern Britain. Accumulation in the first phase was triggered by increased sediment supply from initial retreat of the North Sea ice lobe, and drainage of Dogger Lake. Loess accumulation during this phase was enhanced by easterly winds from Atlantic depressions tracking to the south of Britain, caused by the maximum extent of the Irish Sea Ice Stream at c. 25–24 ka. The subsequent retreat of the western part of the British Irish Ice Sheet then allowed storm tracking further north, which reduced effectiveness of dust transporting winds across southern Britain, while sediment supply and availability was reduced in North Sea source areas. A second retreat of the maximum extent of the North Sea Lobe of ice after c. 21–20 ka would have led to another abrupt input of sediment-rich ice dammed lake and meltwater from eastern England and the North Sea into the exposed southern North Sea area. This would have again dramatically increased sediment availability for transport and deposition as loess in SE England, resulting in the second dust accumulation phase. We also propose that the abrupt stratigraphic change from calcareous to non-calcareous loess up section at Pegwell Bay was driven, not by these changes in dust input, but rather deepening of the permafrost active layer after c. 21 ka. This deepening was associated with warmer and wetter conditions driven by Atlantic storms tracking further north following the regression of the Irish Sea Ice Stream and overall ice sheet retreat. As such, last glacial dust dynamics and loess accumulation in Britain is highly influenced by the interaction of the British Irish Ice Sheet the Fennoscandian Ice sheet, Atlantic storm tracks, and the topography and drainage of the exposed North Sea. © 2020 Elsevier Ltd
英文关键词	Brickearth; Loess; Luminescence; Multi-proxy; Palaeoenvironment; Pegwell bay
语种	英语
scopus关键词	Analytical geochemistry; Deposits; Dust; Dynamics; Glacial geology; Glaciers; Lakes; Luminescence; Particle size; Particle size analysis; Sea ice; Storms; Stratigraphy; Topography; Atmospheric circulation; British-Irish ice sheet; Environmental control; Geochemical analysis; Optically stimulated luminescence; Sampling resolution; Sediment availability; Stratigraphic changes; Sediments; accumulation rate; atmospheric deposition; Heinrich event; ice sheet; ice-dammed lake; Last Glacial; luminescence; meltwater; particle size; permafrost; quartz; sea ice; Atlantic Ocean; England; Irish Sea; Kent; North Sea; United Kingdom
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/151233
作者单位	Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala, 75236, Sweden; Department of Architecture, Design and Planning, University of Sassari, Piazza Duomo 6, Alghero (SS), I-07041, Italy; Department of Physics, University of Burgos, Av. De Cantabria s/n, Burgos, 09006, Spain; Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Cagliari, Cittadella Universitaria (Blocco A), Monserrato, CA 09127, Italy; Institute of Geology and Petroleum Technologies, Kazan Federal University, Kazzan, Russian Federation
推荐引用方式 GB/T 7714	Stevens T.,Sechi D.,Bradák B.,et al. Abrupt last glacial dust fall over southeast England associated with dynamics of the British-Irish ice sheet[J],2020,250.
APA	Stevens T..,Sechi D..,Bradák B..,Orbe R..,Baykal Y..,...&Pascucci V..(2020).Abrupt last glacial dust fall over southeast England associated with dynamics of the British-Irish ice sheet.Quaternary Science Reviews,250.
MLA	Stevens T.,et al."Abrupt last glacial dust fall over southeast England associated with dynamics of the British-Irish ice sheet".Quaternary Science Reviews 250(2020).