Detection of a dynamic topography signal in last interglacial sea-level records.
Detection of a dynamic topography signal in last interglacial sea-level records.
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DOI：
10.1126/sciadv.1700457
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发表时间：
2017-07
期刊：
影响因子：
13.6
通讯作者：
Rovere A
中科院分区：
文献类型：
--
作者：
Austermann J;Mitrovica JX;Huybers P;Rovere A
地幔对流引起的地形变化影响了整个地球仪上末次间冰期的海平面记录。根据当地海平面指标估算末次间冰期最小冰量，需要根据改变当地海平面相对于全球平均水平的过程对这些指标进行校正。虽然冰川均衡调整一般占，全球尺度的动态变化的地形驱动的对流地幔流一般不考虑。我们使用地幔流的数值模型来量化动态地形造成的垂直偏转，并比较被动边缘的预测全球分布的最后一个间冰期海平面标志。由于动态地形而预测的偏转与标记高度显著相关（>95%的概率），并且与标记类型的施工和保存属性一致。我们的结论是，一个动态的地形信号是存在于海拔的最后一次间冰期的海平面记录，该信号必须占在任何努力，以确定峰值全球平均海平面在最后一次间冰期的精度在几米。
Topographic changes due to mantle convection affected the elevation of last interglacial sea-level records across the globe. Estimating minimum ice volume during the last interglacial based on local sea-level indicators requires that these indicators are corrected for processes that alter local sea level relative to the global average. Although glacial isostatic adjustment is generally accounted for, global scale dynamic changes in topography driven by convective mantle flow are generally not considered. We use numerical models of mantle flow to quantify vertical deflections caused by dynamic topography and compare predictions at passive margins to a globally distributed set of last interglacial sea-level markers. The deflections predicted as a result of dynamic topography are significantly correlated with marker elevations (>95% probability) and are consistent with construction and preservation attributes across marker types. We conclude that a dynamic topography signal is present in the elevation of last interglacial sea-level records and that the signal must be accounted for in any effort to determine peak global mean sea level during the last interglacial to within an accuracy of several meters.
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