DOI: 10.1016/j.quascirev.2014.11.020
Scopus记录号: 2-s2.0-84919932965
论文题名: A Younger Dryas plateau icefield in the Monadhliath, Scotland, and implications for regional palaeoclimate
作者: Boston C.M. ; Lukas S. ; Carr S.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 108 起始页码: 139
结束页码: 162
语种: 英语
英文关键词: Glacier reconstruction
; Palaeoclimate
; Plateau icefield
; Scotland
; Younger Dryas
Scopus关键词: Geomorphology
; Landforms
; Glacier reconstruction
; Palaeoclimate
; Plateau icefield
; Scotland
; Younger Dryas
; Glacial geology
英文摘要: A record of Younger Dryas glaciation in Scotland is well established. However, the role of the Monadhliath, a significant plateau area extending over 840km2 in central Scotland, has never been investigated systematically. We present the first systematic glacial geomorphological mapping across the whole region, which has led to the identification of hitherto-unrecorded glacial and associated landforms. The spatial distribution of these landforms indicates that the last phase of glaciation in the area was that of a local plateau icefield. In addition, a clear morphostratigraphical signature provides a strong indication that the icefield dates to the Younger Dryas (12.9-11.7ka), which is supported by numerical ages in the southeast of the study area. Based on the geomorphological evidence and 2D glacier surface profile modelling, a 280km2 icefield is reconstructed. A novel approach is introduced to quantify plateau icefield thickness for equilibrium line altitude (ELA) and palaeoprecipitation calculations, resulting in greater overall data confidence compared to traditional reconstruction methods. The ELA for the whole icefield is calculated to be 714±25m, whilst the ELAs of individual outlet glaciers range from 560m in the west to 816m in the east, demonstrating a significant W-E precipitation gradient across the region during the Younger Dryas. These ELAs compare well with those calculated for Younger Dryas ice masses reconstructed in neighbouring regions and are in good agreement with overall precipitation patterns suggested for Scotland during this time. Whilst the total amount of precipitation calculated from these ELAs is highly dependent on the method used, irrespective of this, the study suggests a more arid Younger Dryas climate in the region compared to the present day. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60046
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography, Queen Mary University of London, Mile End Road, London, United Kingdom; Department of Geography, University of Portsmouth, Buckingham Building, Lion Terrace, Portsmouth, United Kingdom
Recommended Citation:
Boston C.M.,Lukas S.,Carr S.J.. A Younger Dryas plateau icefield in the Monadhliath, Scotland, and implications for regional palaeoclimate[J]. Quaternary Science Reviews,2015-01-01,108