On eustatic sea level history: Last Glacial Maximum to Holocene
On eustatic sea level history: Last Glacial Maximum to Holocene
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DOI：
10.1016/s0277-3791(01)00084-1
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发表时间：
2002
影响因子：
4
通讯作者：
W. Peltier
中科院分区：
文献类型：
--
作者：
W. Peltier
本文讨论了在距今约21,000历年的末次盛冰期（LGM）之后发生的全球平均（上升）海平面上升的幅度和时间依赖性问题。通过对冰川后海平面变化的实际质量守恒和重力自洽理论预测的相对海平面（RSL）历史的分析，证明了在某些海洋位置，这种上升作用很好地近似于局部海平面历史。一个这样的地点是加勒比海的巴巴多斯岛，在那里有一个基于珊瑚的记录，从全新世中期延伸到LGM。然而，由于基于珊瑚的记录所固有的海平面不确定性，重要的是，根据巴巴多斯数据推断的全球冰等效海平面上升曲线必须与其他地点的观测结果进行检验，这些地点也有同样广泛的记录，但这些记录是根据海平面指标得出的，而海平面指标不受珊瑚所固有的模糊性的影响。结果表明，当对全球理论模型中使用的上升函数进行调整，使模型能够拟合假定最大相对海平面（RSL）低气压在120m附近的巴巴多斯观测时，该理论与印度尼西亚群岛巽他陆架和澳大利亚北部J. Bonaparte湾的记录不匹配。这两个最近公布的记录似乎都将RSL的LGM低水位限制在120m以上。本文还讨论了这些结果对解释巴布亚新几内亚休恩半岛和塔希提岛的长珊瑚记录的影响。
This paper addresses the question of the magnitude and time dependence of the globally averaged (eustatic) rise of sea level that occurred subsequent to the time of Last Glacial Maximum (LGM) at approximately 21,000 calendar years before present. Through the analysis of relative sea level (RSL) histories predicted by a realistic mass conserving and gravitationally self-consistent theory of postglacial sea level change, it is demonstrated that there are preferred oceanic locations at which this eustatic function is well approximated by local sea level history. One such location is the Island of Barbados in the Caribbean Sea, a site from which a coral based record exists that extends from mid-Holocene to LGM. Because of the sea level ambiguity that is inherent to coral based records, however, it is important that the global ice-equivalent eustatic sea level curve inferred on the basis of the Barbados data be tested against observations at other locations from which similarly extensive records are also available but which are derived on the basis of sea level indicators which are not subject to the ambiguities inherent to corals. It is shown that, when the eustatic function employed in the global theoretical model is tuned so as to enable the model to fit the Barbados observations, where the maximum relative sea level (RSL) depression is assumed to be near 120m, then the theory misfits the record from the Sunda Shelf in the Indonesian Archipelago as well as the record from J. Bonaparte Gulf in northern Australia. Both of these recently published records appear to constrain the LGM low stand of RSL to a value above 120m. The implications of these results for interpretation of the long coral derived records from the Huon Peninsula of Papua, New Guinea and the island of Tahiti are also discussed.