Advance of East Antarctic outlet glaciers during the Hypsithermal: Implications for the volume state of the Antarctic ice sheet under global warming
Advance of East Antarctic outlet glaciers during the Hypsithermal: Implications for the volume state of the Antarctic ice sheet under global warming
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低温期间南极东部出口冰川的进展：全球变暖对南极冰盖体积状态的影响
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发表时间：
1991
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通讯作者：
Seizo Nakao
中科院分区：
文献类型：
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作者：
E. Domack;A. Jull;Seizo Nakao
我们提出了第一次环东南极全新世年表，根据17放射性碳的加速器方法产生的日期。南极洲东部周围的海洋沉积物包含一个一致的，高分辨率的记录陆源（冰近）和生物（开放海洋）沉积在全新世。这一记录表明，生物沉积下的开放的海洋环境的大陆架上已被限制在大约过去的4万年，而一个时期的陆源沉积有关的接地线前进的冰舌和冰架发生在7和4万年之间。根据Preniz湾（大洋钻探计划）10.7和7.3 ka之间的记录，在晚更新世冰川最大期之后，出现了一个较早的开阔海洋（生物沉积）条件。显然，在全新世中期，东南极冰盖外围沿着出口系统的响应是扩张。这可能是南极“高温”期间气候变暖的直接后果。“南极的温度-累积关系表明，变暖将导致累积而不是消融的显著增加。本文所提供的中全新世数据支持了预测全球变暖下南极冰盖正质量平衡（增长）的模型。
We present the first circum-East Antarctic chronology for the Holocene, based on 17 radiocarbon dates generated by the accelerator method. Marine sediments from around East Antarctica contain a consistent, high-resolution record of terrigenous (ice-proximal) and biogenic (open-marine) sedimentation during Holocene time. This record demonstrates that biogenic sedimentation beneath the open-marine environment on the continental shelf has been restricted to approximately the past 4 ka, whereas a period of terrigenous sedimentation related to grounding line advance of ice tongues and ice shelves took place between 7 and 4 ka. An earlier period of open-marine (biogenic sedimentation) conditions following the late Pleistocene glacial maximum is recognized from the Prydz Bay (Ocean Drilling Program) record between 10.7 and 7.3 ka. Clearly, the response of outlet systems along the periphery of the East Antarctic ice sheet during the mid-Holocene was expansion. This may have been a direct consequence of climate warming during an Antarctic "Hypsithermal." Temperature-accumulation relations for the Antarctic indicate that warming will cause a significant increase in accumulation rather than in ablation. Models that predict a positive mass balance (growth) of the Antarctic ice sheet under global warming are supported by the mid-Holocene data presented herein.