Rigorous 3D change determination in Antarctic Peninsula glaciers from stereo WorldView-2 and archival aerial imagery
Rigorous 3D change determination in Antarctic Peninsula glaciers from stereo WorldView-2 and archival aerial imagery
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DOI：
10.1016/j.rse.2017.10.042
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发表时间：
2018-02-01
影响因子：
13.5
通讯作者：
Fox, Adrian J.
中科院分区：
文献类型：
--
作者：
Fieber, Karolina D.;Mills, Jon P.;Fox, Adrian J.
本文介绍了分布在南极半岛（AP）四个地点的16个冰川的详细海拔和体积分析。这项研究利用新提供的WorldView-2卫星立体图像，利用以前未开发的档案立体航空摄影的价值。高分辨率摄影测量数字高程模型（DEM）的推导，以确定三维冰川变化在一个前所未有的时间跨度为60年，无与伦比的平均面积覆盖率为82%，每个冰川。使用内部强大的表面匹配算法确保了DEM的严格对齐，以克服与处理档案摄影相关的固有问题，最值得注意的是识别和纠正某些数据集中的比例误差。该分析通过扩大AP北部的空间范围，包括位于南设得兰群岛的以前未研究的冰川，深入了解了地球上最具挑战性和数据稀缺的地区之一。81%的冰川在有记录的时期内表现出相当大的体积损失。所有冰川的平均年质量损失为0.24 +/- 0.08 m.w.e.。最大质量损失可达62 m.w.e.。位于象岛最北端的体育场冰川的正面退缩超过2.2公里。观察到的体积损失是广泛的，但并不总是，与正面撤退。所有16个冰川的综合质量平衡结果为-1.862 +/- 0.006 Gt，相当于57年观测期间的-0.005 mm海平面当量（SLE）。
This paper presents detailed elevation and volume analysis of 16 individual glaciers, grouped at four locations, spread across the Antarctic Peninsula (AP). The study makes use of newly available WorldView-2 satellite stereo imagery to exploit the previously untapped value of archival stereo aerial photography. High resolution photogrammetric digital elevation models (DEMs) are derived to determine three-dimensional glacier change over an unprecedented time span of six decades with an unparalleled mean areal coverage of 82% per glacier. The use of an in-house robust surface matching algorithm ensured rigorous alignment of the DEMs to overcome inherent problems associated with processing archival photography, most notably the identification and correction of scale error in some datasets. The analysis provides insight into one of the most challenging and data-scarce areas on the planet by expanding the spatial extent north of the AP to include previously un-studied glaciers located in the South Shetland Islands. 81% of glaciers studied showed considerable loss of volume over the period of record. The mean annual mass loss for all glaciers yielded 0.24 +/- 0.08 m.w.e. per year, with a maximum mass loss of up to 62 m.w.e. and frontal retreat exceeding 2.2 km for Stadium Glacier, located furthest north on Elephant Island. Observed volumetric loss was broadly, though not always, correlated with frontal retreat. The combined mass balance of all 16 glaciers yielded- 1.862 +/- 0.006 Gt, which corresponds to- 0.005 mm sea level equivalent (SLE) over the 57 year observation period.