Sea-level evolution of the Laptev Sea and the East Siberian Sea since the last glacial maximum
Sea-level evolution of the Laptev Sea and the East Siberian Sea since the last glacial maximum
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末次盛冰期以来拉普捷夫海和东西伯利亚海的海平面演变
DOI：
10.1007/s41063-015-0004-x
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Opel
中科院分区：
文献类型：
--
作者：
V. Klemann;B. Heim;H. Bauch;S. Wetterich;T. Opel
拉普捷夫海和东西伯利亚海是冰川时期全球平均海平面比现今低100 m以上时，由大量陆地沉降而成的延伸浅海。为了了解环境历史，特别是该地区大型近海永久冻土复合体的演变，进行了海平面变化和海岸线迁移的重建。缺乏足够的海平面指示的地质信息，在最近的研究中，海平面变化曲线通常被应用，忽略了任何均衡调整过程。在这项研究中，我们讨论了冰川均衡调整（GIA）的影响，它描述了固体地球的变形响应和由此产生的海平面变化，由于在冰川循环期间冰盖和海洋之间的水质量重新分配。出于敏感性研究的动机，我们认为GIA引起的海平面变化从末次冰期最大（LGM），目前和应用地球模型合奏，涵盖了合理的流变参数化的被动大陆边缘的范围。地球动力学一致的海平面重建应用于预测在拉普捷夫和东西伯利亚海的海岸线撤退。我们确认这项研究的应用程序的海平面变化曲线是一个有效的一阶近似重建的海岸线位置从LGM到现在，而海平面高度远离海岸线推断海平面变化曲线显着不同GIA预测。
The Laptev Sea and East Siberian Sea are extended shallow shelf seas which were largely land fallen during glacial periods when the global mean sea level was more than 100 m below its present value. To understand the environmental history, and, in particular, the evolution of the large offshore permafrost complexes in this region, a reconstruction of the sea-level variation and shoreline migration was undertaken. Sufficient geological information by sea-level indicators is missing and, in recent studies, the eustatic sea-level curve is commonly applied, neglecting any isostatic adjustment processes. In this study, we discuss the influence of glacial isostatic adjustment (GIA), which describes the deformational response of the solid earth and the resulting sea-level variations due to the water mass redistribution between ice sheets and ocean during a glacial cycle. Motivated as a sensitivity study, we consider GIA-induced sea-level variations from the last glacial maximum (LGM) to present and apply an earth model ensemble which covers the range of reasonable rheological parametrisations for a passive continental margin. The geodynamically consistent sea-level reconstructions are applied to predict the shoreline retreat in the Laptev and East Siberian seas. We confirm with this study that the application of the eustatic sea-level curve is a valid first-order approximation for reconstructing the shoreline position from LGM to present, whereas the sea-level heights away from the shoreline inferred from the eustatic sea-level curve differ markedly from GIA predictions.