Lessons learned from shallow subglacial bedrock drilling campaigns in Antarctica
Lessons learned from shallow subglacial bedrock drilling campaigns in Antarctica
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从南极洲浅层冰下基岩钻探活动中汲取的经验教训
DOI：
10.1017/aog.2024.12
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发表时间：
2024
影响因子：
2.9
通讯作者：
Johnson, Joanne S.
中科院分区：
文献类型：
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作者：
Braddock, Scott;Venturelli, Ryan A.;Nichols, Keir;Moravec, Elliot;Boeckmann, Grant V.;Campbell, Seth;Balco, Greg;Ackert, Robert;Small, David;Johnson, Joanne S.
我们回顾了最近五次冰下基岩钻探活动的成功和挑战，这些活动旨在寻找南极冰盖在过去地质温暖时期消退的证据。对极地冰盖比现在小的时代的洞察为建模工作提供了指导信息，这些建模工作旨在预测未来随着南极冰盖的大幅消退而出现的海平面上升的速度和幅度。为冰川消融的时间和先前冰盖的最小范围提供直接证据的一种方法是从现代冰盖表面下面提取冰下基岩岩芯用于宇宙成因核素分析。在这里，我们总结了自2016年以来在整个西南极从浅层(冰面下120米)获取基岩岩芯的五个野外季节的经验教训。我们的发现集中在钻探工作和技术以及使用探地雷达的地球物理调查上。浅层冰下钻探提供了一种高风险、高回报的手段来测试南极冰盖过去的不稳定性，我们重点介绍了关键挑战和解决方案，以增加未来在极地地区进行冰下钻探的成功可能性。
We review successes and challenges from five recent subglacial bedrock drilling campaigns intended to find evidence for Antarctic Ice Sheet retreat during warm periods in the geologic past. Insights into times when the polar ice sheets were smaller than present serve as guiding information for modeling efforts that aim to predict the rate and magnitude of future sea level rise that would accompany major retreat of the Antarctic Ice Sheet. One method to provide direct evidence for the timing of deglaciations and minimum extent of prior ice sheets is to extract subglacial bedrock cores for cosmogenic nuclide analysis from beneath the modern ice sheet surface. Here we summarize the lessons learned from five field seasons tasked with obtaining bedrock cores from shallow depths (<120 m beneath ice surface) across West Antarctica since 2016. We focus our findings on drilling efforts and technology and geophysical surveys with ground-penetrating radar. Shallow subglacial drilling provides a high risk, high reward means to test for past instabilities of the Antarctic Ice Sheet, and we highlight key challenges and solutions to increase the likelihood of success for future subglacial drilling efforts in polar regions.