Evaluating the Duration and Continuity of Potential Climate Records From the Allan Hills Blue Ice Area, East Antarctica
Evaluating the Duration and Continuity of Potential Climate Records From the Allan Hills Blue Ice Area, East Antarctica
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DOI：
10.1029/2018gl077511
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发表时间：
2018-05
影响因子：
5.2
通讯作者：
L. Kehrl;H. Conway;N. Holschuh;S. Campbell;A. Kurbatov;N. Spaulding
中科院分区：
文献类型：
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作者：
L. Kehrl;H. Conway;N. Holschuh;S. Campbell;A. Kurbatov;N. Spaulding
目前的冰芯记录可以追溯到80万年前。地质学和冰川学证据表明，南极洲东部的艾伦山蓝冰区可能保存了一个连续的记录，可以追溯到更早的时间。在这项研究中，我们使用冰穿透雷达和现有的年龄限制来绘制艾伦山主冰原的内部地层和年龄结构。定年的等时线为冰流模型提供了约束条件，以估计河床附近的冰龄。该地区以前的钻探恢复了270万年前的冰层地层扰动部分。我们的研究确定了上游约5公里处的一个地点，该地点可能保留了海洋同位素第11阶段的连续记录，该记录可能可以追溯到100万年前。这些记录将为罗斯海地区过去的气候和冰川历史提供新的见解。
The current ice core record extends back 800,000 years. Geologic and glaciological evidence suggests that the Allan Hills Blue Ice Area, East Antarctica, may preserve a continuous record that extends further back in time. In this study, we use ice‐penetrating radar and existing age constraints to map the internal stratigraphy and age structure of the Allan Hills Main Ice Field. The dated isochrones provide constraints for an ice flow model to estimate the age of ice near the bed. Previous drilling in the region recovered stratigraphically disturbed sections of ice up to 2.7 million years old. Our study identifies a site ~5 km upstream, which likely preserves a continuous record through Marine Isotope Stage 11 with the possibility that the record extends back 1 million years. Such records would provide new insight into the past climate and glacial history of the Ross Sea Sector.