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DOI	10.1016/j.quascirev.2019.03.019
	A spatially-restricted Younger Dryas plateau icefield in the Gaick; Scotland: Reconstruction and palaeoclimatic implications
	Chandler B.M.P.; Boston C.M.; Lukas S.
发表日期	2019
ISSN	0277-3791
起始页码	107
结束页码	135
卷号	211
英文摘要	Considerable research has been conducted in Scotland to reconstruct Younger Dryas glaciers and palaeoclimatic conditions, but our understanding remains incomplete. In this contribution, we examine the Gaick, a dissected plateau that extends over ∼520 km 2 in the Central Grampians, Scotland. The extent and style of Younger Dryas glaciation in the Gaick has been repeatedly contested, although a model of extensive plateau icefield glaciation has become generally accepted. This is despite well-documented issues with key elements of the plateau icefield reconstruction. We synthesise the results of recent geomorphological mapping in the Gaick and recognise a distinct morphostratigraphic signature in the upper parts of the western catchments. This differs markedly from sediment-landform associations in other parts of the area, and we argue this provides a strong indication of spatially-restricted Younger Dryas (∼12.9–11.7 ka) glaciation in the Gaick. Our interpretation is independently supported by glacierisation threshold analysis, which implies that the eastern Gaick was unable to nourish Younger Dryas ice. We therefore contest the accepted paradigm of extensive Younger Dryas glaciation in this area. Based on the geomorphological evidence and glacier surface profile modelling, we reconstruct a ∼42 km 2 plateau icefield that yields an equilibrium line altitude of 751 ± 46 m. Using this value, a sea-level precipitation value of 826 ± 331 mm a −1 is inferred for the Younger Dryas, which suggests considerably drier conditions than at present. Using recalculated glacier-derived precipitation estimates from Scotland, we present regional climate analysis that corroborates arguments for a strong west-east precipitation gradient across Scotland. © 2019 Elsevier Ltd
英文关键词	Glacier reconstruction; Palaeoclimate; Plateau icefield; Scotland; Younger Dryas
语种	英语
scopus关键词	Catchments; Sea level; Glacier reconstruction; Palaeoclimate; Plateau icefield; Scotland; Younger Dryas; Glacial geology; climate conditions; equilibrium line; geomorphological mapping; glaciation; glacier; ice field; paleoclimate; plateau; precipitation assessment; reconstruction; regional climate; Younger Dryas; Grampian Highlands; Scotland; 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/151965
作者单位	School of Geography, Queen Mary University of London, Mile End Road, London, E1 4NS, United Kingdom; Department of Geography, University of Portsmouth, Buckingham Building, Lion Terrace, Portsmouth, PO1 3HE, United Kingdom; Department of Geology, Lund University, Sölvegatan 12, Lund, 223 62, Sweden
推荐引用方式 GB/T 7714	Chandler B.M.P.,Boston C.M.,Lukas S.. A spatially-restricted Younger Dryas plateau icefield in the Gaick; Scotland: Reconstruction and palaeoclimatic implications[J],2019,211.
APA	Chandler B.M.P.,Boston C.M.,&Lukas S..(2019).A spatially-restricted Younger Dryas plateau icefield in the Gaick; Scotland: Reconstruction and palaeoclimatic implications.Quaternary Science Reviews,211.
MLA	Chandler B.M.P.,et al."A spatially-restricted Younger Dryas plateau icefield in the Gaick; Scotland: Reconstruction and palaeoclimatic implications".Quaternary Science Reviews 211(2019).