Changes in Canadian Arctic Ice Shelf Extent Since 1906
Changes in Canadian Arctic Ice Shelf Extent Since 1906
复制标题
1906 年以来加拿大北极冰架范围的变化
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Jeffries
中科院分区：
文献类型：
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作者：
D. Mueller;L. Copland;M. Jeffries
至少自世纪初以来，埃尔斯米尔岛北方海岸的冰架沿着一直处于下降状态。来自探险家杂志、航空照片和卫星图像的现有数据已汇编成一个单一的地理空间数据库，其中包括1906年至2015年13个观测期的冰架和冰川冰舌范围。在此期间，冰架面积减少了8，061平方公里（94%）。这种损失的绝大多数是通过间歇性产犊发生的，特别是在二十世纪的前六十年。最近，在1998年至2015年期间，515平方公里的陆架冰崩解。一些冰架也在原地变薄，过渡到更薄和更弱的冰类型，不再被认为是冰架，尽管这种转变的时间很难用这里使用的方法来限制。一些部分由冰舌组成的冰架（冰川或复合冰架）也解体到冰舌被孤立的程度，这代表着冰架范围的丧失。我们的数字化方法通常可重复性在3%以内，并且通常与过去的范围确定一致。这些巨大特征的分解是一个持续的现象，希望这里提供的综合数据集将为比较该地区未来的变化提供基础。
The ice shelves along the northern coast of Ellesmere Island have been in a state of decline since at least the early twentieth century. Available data derived from explorers’ journals, aerial photographs and satellite imagery have been compiled into a single geospatial database of ice shelf and glacier ice tongue extent over 13 observation periods between 1906 and 2015. During this time there was a loss of 8,061 km2 (94%) in ice shelf area. The vast majority of this loss occurred via episodic calving, in particular during the first six decades of the twentieth century. More recently, between 1998 and 2015, 515 km2 of shelf ice calved. Some ice shelves also thinned in situ, transitioning to thinner and weaker ice types that can no longer be considered ice shelf, although the timing of this shift is difficult to constrain with the methods used here. Some ice shelves composed partly of ice tongues (glacier or composite ice shelves) also disintegrated to the point where the ice tongues were isolated, representing a loss of ice shelf extent. Our digitization methods are typically repeatable to within 3%, and generally agree with past determinations of extent. The break-up of these massive features is an ongoing phenomenon, and it is hoped that the comprehensive dataset presented here will provide a basis for comparison of future changes in this region.