Laurentide-Cordilleran Ice Sheet saddle collapse as a contribution to meltwater pulse 1A
Laurentide-Cordilleran Ice Sheet saddle collapse as a contribution to meltwater pulse 1A
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DOI：
10.1002/2015gl063960
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发表时间：
2015-05-28
影响因子：
5.2
通讯作者：
Payne, A. J.
中科院分区：
文献类型：
--
作者：
Gomez, N.;Gregoire, L. J.;Payne, A. J.
在分布广泛的地点记录到的类似于 14.5ka 的融水脉冲 1A (MWP-1A) 的来源或来源尚不确定，因为海平面在不到 500 年的时间里上升了大约 10-20m。最近对北美和格陵兰岛进行的一项冰模型研究表明，劳伦泰德冰盖和科迪勒拉冰盖之间的冰鞍塌陷（其海平面当量 (ESLE) 接近 10m）可能是 MWP-1A 的主要原因。为了检验这一建议，我们预测了与冰模型相关的从末次盛冰期到当今的重力自洽海平面变化。我们发现，马鞍塌陷情景与北美和格陵兰岛以外的融化（ESLE 接近 3m）相结合，导致 MWP-1A 的海平面变化与巴巴多斯、塔希提岛和巽他大陆架的远场海平面记录一致。
The source or sources of meltwater pulse 1A (MWP-1A) at similar to 14.5ka, recorded at widely distributed sites as a sea level rise of similar to 10-20m in less than 500years, is uncertain. A recent ice modeling study of North America and Greenland has suggested that the collapse of an ice saddle between the Laurentide and Cordilleran ice sheets, with a eustatic sea level equivalent (ESLE) of similar to 10m, may have been the dominant contributor to MWP-1A. To test this suggestion, we predict gravitationally self-consistent sea level changes from the Last Glacial Maximum to the present day associated with the ice model. We find that a combination of the saddle collapse scenario and melting outside North America and Greenland with an ESLE of similar to 3m yields sea level changes across MWP-1A that are consistent with far-field sea level records at Barbados, Tahiti, and Sunda Shelf.