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Last deglacial relative sea level variations in Antarctica derived from glacial isostatic adjustment modelling
  • 分类:P532[天文地球—古生物学与地层学;天文地球—地质学] S757.46[农业科学—森林经理学;农业科学—林学]
  • 作者机构:[1]National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan, [2]Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, 3173-25 Showa-machi, Kanazawa-ku, Yokohama 236-0001, Japan
  • 相关基金:We thank comments from anonymous reviewer and Guest Editor Dr. Toshiaki Tsunogae. This work was partly supported by JSPS KAKENHI grant numbers 23501255, 21253001.
中文摘要:

我们自从在以前的工作给的最后冰川的最大值(LGM ) ,在南极洲的现在的相对的海水平(RSL ) 曲线基于南极冰表的融化的情形从冰川的均衡说的调整(GIA ) 导出预言。同时,沿着南极洲的海岸在提起的沙滩获得的 Holocene 年龄 RSL 观察被显示与 GIA 预言一致。从关于空间分发和融化的冰的全部的集体变化的以前出版的装载冰的模型的差别是重要的。这些模型也从 GIA 建模被导出;变化能由于冰表进化关于外壳的运动的历史被归因于地质、地理的证据的缺乏。下次,我们总结以前出版的冰负担模型并且证明 RSL 基于不同的冰和地球模型的联合弯。GIA 模型计算的 RSL 曲线显示冰和地球模型的模型依赖在 RSL 观察被获得的几个地点显著地大。特别地, GIA 预言基于薄 lithospheric 厚度显示出依赖于在每个地点的融化的冰厚度的空间分布。从地球的短波长的变丑的这些特征结果。然而,我们的预言强烈建议尽管有 lithospheric 厚度的不同模型的使用,发现平均的冰模型是可能的。海运水平和外壳的运动观察,我们能详细推出 post-LGM 冰表的几何学并且把 GIA 贡献从到空间观察的外壳的变丑和严肃变化移开测地学的技术例如 GPS 和优雅,为与最近的全球温暖联系的南极冰团变化的评价。

英文摘要:

We present relative sea level (RSL) curves in Antarctica derived from glacial isostatic adjustment (GIA)predictions based on the melting scenarios of the Antarctic ice sheet since the Last Glacial Maximum (LGM)given in previous works.Simultaneously,Holocene-age RSL observations obtained at the raised beaches along the coast of Antarctica are shown to be in agreement with the GIA predictions.The differences from previously published ice-loading models regarding the spatial distribution and total mass change of the melted ice are significant.These models were also derived from GIA modelling; the variations can be attributed to the lack of geological and geographical evidence regarding the history of crustal movement due to ice sheet evolution.Next,we summarise the previously published ice load models and demonstrate the RSL curves based on combinations of different ice and earth models.The RSL curves calculated by GIA models indicate that the model dependence of both the ice and earth models is significantly large at several sites where RSL observations were obtained.In particular,GIA predictions based on the thin lithospheric thickness show the spatial distributions that are dependent on the melted ice thickness at each sites.These characteristics result from the short-wavelength deformation of the Earth.However,our predictions strongly suggest that it is possible to find the average ice model despite the use of the different models of lithospheric thickness.By sea level and crustal movement observations,we can deduce the geometry of the post-LGM ice sheets in detail and remove the GIA contribution from the crustal deformation and gravity change observed by space geodetic techniques,such as GPS and GRACE,for the estimation of the Antarctic ice mass change associated with recent global warming.

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