Assessing the continuity of the blue ice climate record at Patriot Hills, Horseshoe Valley, West Antarctica
Assessing the continuity of the blue ice climate record at Patriot Hills, Horseshoe Valley, West Antarctica
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DOI：
10.1002/2015gl066476
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发表时间：
2016-03
影响因子：
5.2
通讯作者：
Kate Winter;John Woodward;S. Dunning;C. Turney;C. Fogwill;A. Hein;N. Golledge;R. Bingham;S. Marrero;D. Sugden;N. Ross
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文献类型：
--
作者：
Kate Winter;John Woodward;S. Dunning;C. Turney;C. Fogwill;A. Hein;N. Golledge;R. Bingham;S. Marrero;D. Sugden;N. Ross
本文利用高分辨率探地雷达（GPR）对南极西部马蹄铁谷爱国者山蓝冰区（BIA）水平气候记录的连续性进行了评估。该序列在~18 cal ka、~12 cal ka和~8 cal ka有3次明显的氘同位素变化。沿气候序列的探地雷达探测显示连续的、整合的倾斜等时线，在等时线层中被两个不整合面隔开，这与两次较早的氘移动有关。我们将这些不整合解释为序列的不连续性，而不是气候变化的直接措施。冰盖模型和内层连续性指数图表明，不整合面代表了侵蚀发生的时期，因为以前的冰表面受到马蹄谷头部山前的倾斜风的冲刷。该研究证明了高分辨率探地雷达调查对研究古流动动力学和解释BIA气候记录的重要性。
We use high‐resolution ground‐penetrating radar (GPR) to assess the continuity of the Blue Ice Area (BIA) horizontal climate record at Patriot Hills, Horseshoe Valley, West Antarctica. The sequence contains three pronounced changes in deuterium isotopic values at ~18 cal ka, ~12 cal ka, and ~8 cal ka. GPR surveys along the climate sequence reveal continuous, conformable dipping isochrones, separated by two unconformities in the isochrone layers, which correlate with the two older deuterium shifts. We interpret these unconformities as discontinuities in the sequence, rather than direct measures of climate change. Ice sheet models and Internal Layer Continuity Index plots suggest that the unconformities represent periods of erosion occurring, as the former ice surface was scoured by katabatic winds in front of mountains at the head of Horseshoe Valley. This study demonstrates the importance of high‐resolution GPR surveys for investigating both paleoflow dynamics and interpreting BIA climate records.