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Holocene relative sea-level changes and ice fluctuations in the South Shetland Islands

机译：南设得兰群岛全新世相对海平面变化和冰波动

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摘要

Determining the nature and timing of glacial and climate fluctuations in Antarctica relative to those in the rest of the Southern Hemisphere is prerequisite for understanding the role of the southern high latitudes in climate change. Here, I present relative sea-level data from the South Shetland Islands (62-63°S, 58-61°W) that bear on the timing of Holocene deglaciation and subsequent ice fluctuations. Radiocarbon dates from raised beach sediments indicate that the 18-21 m elevation beach that marks marine limit dates to -7000 cal yr B.P. However, limited evidence from stratigraphic sections and lake cores suggests that initial deglaciation may have occurred more than 2000 yr earlier. Rather than showing an exponential shape, typical of other Antarctic sites, the relative sea-level record of the South Shetland Islands is complex and characterized by what appear to be transgressions at ～6000～7000 and ～400 cal yr B.P. These transgressions may have been linked to glacial advance.
机译：相对于南半球其他地区而言，确定南极冰川和气候波动的性质和时间是了解南部高纬度在气候变化中的作用的前提。在这里，我介绍了来自南设得兰群岛（62-63°S，58-61°W）的相对海平面数据，这些数据影响了全新世冰消时间和随后的冰雪波动。高架海滩沉积物的放射性碳年代数据表明，海拔18-21 m的海滩标志着海洋极限日期为B.P. -7000 cal.yr.然而，从地层剖面和湖泊核心的有限证据表明，最初的冰消作用可能早于2000年发生。南设得兰群岛的相对海平面记录没有显示出其他南极站点典型的指数形状，而是复杂的，其特征是在公元前6,000〜7000年和〜400 cal年出现海侵。这些违法行为可能与冰川发展有关。

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