Lauren Knight, Clare M. Boston, Harold Lovell, Timothy T. Barrows, Eric A. Colhoun, David Fink, Nicholas C. Pepin
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引用次数: 0
摘要
在爱尔兰,Nahanagan Stadial (NS)以环状冰川、高原冰原和高山冰盖扩张为特征,并以威克洛山脉(Wicklow Mountains)纳哈那根湖(Lough Nahanagan)的环状冰川类型遗址命名。这一时期大致相当于新仙女木期和格陵兰期(GS-1: ~12.9 ~ 11.7 ka)。在这里,我们通过结合太阳辐射模拟、冰川地貌测绘、10Be和26Al宇宙形成表面暴露测年、三维冰川重建以及吹雪和雪崩潜力分析,首次对Wicklow Mountains的NS冰川覆盖范围进行了全面评估。我们确定了七个地点,在这个时候有马戏团冰川。冰川的范围非常有限,大多数冰川只能部分填满它们的圆环。平衡线高度(ELAs)在纳哈纳根湖(Lough Nahanagan) 470±5 ~ 721±5 m a.s.l.之间,平均ELAs为599 m a.s.l.。在ELAs较低的地点,较高的吹雪和雪崩贡献表明局地气候对冰川生长和保存的影响与区域气候同时发生。威克洛山脉提供了GS-1期间边缘环状冰川的一个很好的例子,以及当地地形和小气候对维持英国和爱尔兰一些山区冰川的重要性。
Restricted cirque glaciers in the Wicklow Mountains, Ireland, during the Nahanagan Stadial (Greenland Stadial-1/Younger Dryas)
In Ireland, the Nahanagan Stadial (NS) was characterised by cirque glacier, plateau icefield and mountain ice cap expansion and is named after the cirque glacier type-site of Lough Nahanagan in the Wicklow Mountains. This period is broadly equivalent to the Younger Dryas Stadial and Greenland Stadial-1 (GS-1: ~12.9–11.7 ka). Here, we provide the first evaluation of the full extent of NS glaciation in the Wicklow Mountains by combining solar radiation modelling, mapping of glacial geomorphology, 10Be and 26Al cosmogenic surface exposure dating, 3D glacier reconstructions and analysis of snowblow and avalanching potential. We identify seven sites that hosted cirque glaciers at this time. Glacier extent was very restricted, with most glaciers only partially filling their cirques. Equilibrium line altitudes (ELAs) ranged from 470 ± 5 m a.s.l. (Lough Nahanagan) to 721 ± 5 m a.s.l. (Lough Cleevaun), with an average ELA of 599 m a.s.l. Higher snowblow and avalanching contributions at sites with lower ELAs demonstrate local topoclimatic influence on glacier growth and preservation alongside regional climate. The Wicklow Mountains provides a good example of marginal cirque glaciation during GS-1 and the importance of local topography and microclimate for sustaining glaciers in some mountain areas of Britain and Ireland.
期刊介绍:
The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.