Excess ice loads in the Indian Ocean sector of East Antarctica during the last glacial period
Excess ice loads in the Indian Ocean sector of East Antarctica during the last glacial period
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末次冰期期间东南极洲印度洋部分的过量冰负荷
DOI：
10.1130/g48830.1
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发表时间：
2021
期刊：
影响因子：
5.8
通讯作者：
Suganuma Yusuke
中科院分区：
文献类型：
--
作者：
Ishiwa Takeshige;Okuno Jun'ichi;Suganuma Yusuke
准确重建南极冰盖对于了解冰盖对全球气候变化的反应至关重要。然而，冰盖扩张的侵蚀性质和进入南极洲大部分地区的困难使得在末次冰盛期之前获得冰盖和海平面变化的实地证据具有挑战性。东南极的吕措-霍尔姆湾和普雷兹湾的有限沉积记录表明，尽管全球海平面下降不到-40米，但海洋同位素阶段3期间的海平面接近于现在的水平。我们展示了冰川均衡调整模型与完善的南极冰盖加载的历史。我们的实验表明，南极冰盖的印度洋部门将被要求经历过量的冰负荷前的最后一次冰期最大，以解释海洋同位素阶段3期间观察到的海平面高。因此，我们认为南极冰盖在全球末次盛冰期之前部分达到了最大厚度。
An accurate reconstruction of the Antarctic Ice Sheet is essential in order to develop an understanding of ice-sheet responses to global climate changes. However, the erosive nature of ice-sheet expansion and the difficulty of accessing much of Antarctica make it challenging to obtain field-based evidence of ice-sheet and sea-level changes before the Last Glacial Maximum. Limited sedimentary records from Lützow-Holm and Prydz Bays in East Antarctica demonstrate that the sea level during Marine Isotope Stage 3 was close to the present level despite the global sea-level drop lower than −40 m. We demonstrate glacial isostatic adjustment modeling with refined Antarctic Ice Sheet loading histories. Our experiments reveal that the Indian Ocean sector of the Antarctic Ice Sheet would have been required to experience excess ice loads before the Last Glacial Maximum in order to explain the observed sea-level highstands during Marine Isotope Stage 3. As such, we suggest that the Antarctic Ice Sheet partly reached its maximum thickness before the global Last Glacial Maximum.