Greenland glacial history and local geodynamic consequences
Greenland glacial history and local geodynamic consequences
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格陵兰冰川历史和当地地球动力学后果
DOI：
10.1046/j.1365-246x.2002.01702.x
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发表时间：
2002
影响因子：
2.8
通讯作者：
W. Peltier
中科院分区：
文献类型：
--
作者：
L. Tarasov;W. Peltier
摘要存在于末次冰期最大期（LGM）的大陆冰盖的时空重建以前使用两种完全独立的方法进行。一个是基于使用冰盖积累和流动的理论模型，另一个是基于对以前冰盖地区的相对海平面（RSL）历史的地球物理反演。本文所述的分析表明，对格陵兰的具体情况同时采用这两种方法具有重大优势。因此，我们表明，ICE-4G重建的冰川历史的这一地区从末次冰期到现在，这是基于地球物理反演的RSL数据单独，是相当准确的，在周边地区的RSL数据，但不准确的内部冰盖，这是不受这些信息。我们通过采用最近发布的整个冰盖内部区域质量平衡和GPS测量的大地测量推断，测试了格陵兰岛冰川历史的新模型，该模型是通过同时应用冰盖建模和RSL数据地球物理反演得出的约束来确定的。地壳垂直运动。这些观测结果并没有被用来限制冰盖的重建，而是为我们的分析所推断的格陵兰岛新的冰川历史提供了重要的支持。
SUMMARY Space‐time reconstructions of the continental ice-sheets that existed at Last Glacial Maximum (LGM) have previously been produced using two entirely independent methodologies. One based upon the use of theoretical models of ice-sheet accumulation and flow and one based upon the geophysical inversion of relative sea level (RSL) histories from previously ice-covered regions. The analyses described in this paper demonstrate the significant advantages that derive from the simultaneous application of both methods to the particular case of Greenland. We thereby show that the ICE-4G reconstruction of the glaciation history of this region from LGM to present, which was based upon the geophysical inversion of RSL data alone, was reasonably accurate in the peripheral regions where RSL data were available but inaccurate in the interior of the ice-sheet, which was unconstrained by such information. We test the new model of Greenland glacial history determined by the simultaneous application of the constraints that derive from ice-sheet modelling and the geophysical inversion of RSL data by employing recently published geodetic inferences of mass-balance over the entire interior region of the ice sheet and of GPS measurements of vertical crustal motion. These observations, which were not employed to constrain the ice-sheet reconstruction, provide significant support for the new glacial history for Greenland that our analyses have led us to infer.