Holocene dynamics of the Arctic's largest ice shelf
Holocene dynamics of the Arctic's largest ice shelf
复制标题
北极最大冰架的全新世动力学
DOI：
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发表时间：
2011
影响因子：
11.1
通讯作者：
W. Vincent
中科院分区：
文献类型：
--
作者：
D. Antoniades;P. Francus;R. Pienitz;G. St‐Onge;W. Vincent
北极的冰架在世纪失去了90%以上的总表面积，并继续迅速解体。然而，这些变化的重要性被北极冰架的个体发育约束不良所掩盖。在这里，我们使用的沉积记录背后的最大的剩余冰架在北极，沃德亨特冰架（埃尔斯米尔岛，加拿大），建立一个长期的背景下，以评估最近的冰架恶化。沉积物芯的多代理分析显示，显着的生物和地球化学变化在迪斯雷利峡湾的沃德亨特冰架的形成及其波动，随着时间的推移。我们的研究结果表明，冰架在全新世早期并不存在，而是在4,000年前因气候变冷而形成的。古生态学数据表明，沃德亨特冰架在大约1,400年前发生的一次重大断裂事件之前保持了近3000年的稳定。在800年前的改革之后，淡水一直是迪斯雷利峡湾的一个特征，直到世纪早期其陆架上湖的灾难性排水。
Ice shelves in the Arctic lost more than 90% of their total surface area during the 20th century and are continuing to disintegrate rapidly. The significance of these changes, however, is obscured by the poorly constrained ontogeny of Arctic ice shelves. Here we use the sedimentary record behind the largest remaining ice shelf in the Arctic, the Ward Hunt Ice Shelf (Ellesmere Island, Canada), to establish a long-term context in which to evaluate recent ice-shelf deterioration. Multiproxy analysis of sediment cores revealed pronounced biological and geochemical changes in Disraeli Fiord in response to the formation of the Ward Hunt Ice Shelf and its fluctuations through time. Our results show that the ice shelf was absent during the early Holocene and formed 4,000 years ago in response to climate cooling. Paleoecological data then indicate that the Ward Hunt Ice Shelf remained stable for almost three millennia before a major fracturing event that occurred ∼1,400 years ago. After reformation ∼800 years ago, freshwater was a constant feature of Disraeli Fiord until the catastrophic drainage of its epishelf lake in the early 21st century.
影响因子：
4
作者：
S. Belt;Lindsay L. Vare;G. Massé;G. Massé;H. Manners;J. C. Price;S. Maclachlan;J. Andrews;S. Schmidt
通讯作者：
S. Belt;Lindsay L. Vare;G. Massé;G. Massé;H. Manners;J. C. Price;S. Maclachlan;J. Andrews;S. Schmidt