Ice margin oscillations during deglaciation of the northern Irish Sea Basin
Ice margin oscillations during deglaciation of the northern Irish Sea Basin
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DOI：
10.1002/jqs.3057
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发表时间：
2018-07
影响因子：
2.3
通讯作者：
R. Chiverrell;R. Smedley;David Small;C. Ballantyne;M. Burke;S. L. Callard;Christopher D. Clark;G. Duller;David J. A. Evans;D. Fabel;K. V. Landeghem;S. Livingstone;C. Ó. Cofaigh;G. Thomas;D. Roberts;M. Saher;J. Scourse;Peter Wilson
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文献类型：
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作者：
R. Chiverrell;R. Smedley;David Small;C. Ballantyne;M. Burke;S. L. Callard;Christopher D. Clark;G. Duller;David J. A. Evans;D. Fabel;K. V. Landeghem;S. Livingstone;C. Ó. Cofaigh;G. Thomas;D. Roberts;M. Saher;J. Scourse;Peter Wilson
我们提出了一个新的年表来限制爱尔兰北部海盆的冰缘退缩。从马恩岛和坎布里亚岛西南部山顶的巨石表面暴露年龄得出的冰变薄时间的估计表明，冰变薄与爱尔兰海冰流(ISIS)短暂推进到凯尔特海最大限度后的快速消退相称。爱尔兰北部海盆的这次冰川消退速度最快，为20ka，以应对更大的崩解边缘，但随着冰的稳定和对马恩岛的振荡，冰川消退速度放缓。我们提供了苏格兰后进(19.2-18.2ka)的第一个年龄限制，并证明这是一个跨越马恩岛和坎布里亚低地的潜在区域性事件，与海因里希事件1无关。在苏格兰后进之后，冰锋向北向苏格兰南部高地撤退，同时∼45°N以北的气候因夏季日照而变暖。这一序列表明了内部动力在控制爱尔兰海冰川退缩速度方面的重要性，但也表明爱尔兰海北部盆地的冰川消融是对气候变暖的反应。
We present a new chronology to constrain ice‐margin retreat in the northern Irish Sea Basin. Estimates on the timing of ice thinning derived from surface exposure ages for boulders from the summits of the Isle of Man and south‐west Cumbria suggest that ice thinning was commensurate with the rapid retreat that followed the short‐lived advance of the Irish Sea Ice Stream (ISIS) to maximum limits in the Celtic Sea. This ice retreat in the northern Irish Sea Basin was fastest at 20 ka in response to a wider calving margin, but slowed as ice stabilized and oscillated against the Isle of Man. We provide the first age constraints for the Scottish Readvance (19.2–18.2 ka) and demonstrate that it was a potentially regional event across the Isle of Man and Cumbrian lowlands not linked with Heinrich Event 1. After the Scottish Readvance, the ice front retreated northwards towards the Southern Uplands of Scotland at the same time as climate north of ∼45°N warmed in response to summer insolation. This sequence demonstrates the importance of internal dynamics in controlling ice retreat rates in the Irish Sea, but also that deglaciation of the northern Irish Sea Basin was a response to climate warming.