Elevation changes of the Holm Land Ice Cap, northeast Greenland, from 1978 to 2012–2015, derived from high-resolution digital elevation models
Elevation changes of the Holm Land Ice Cap, northeast Greenland, from 1978 to 2012–2015, derived from high-resolution digital elevation models
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格陵兰岛东北部霍尔姆地冰盖从 1978 年到 2012-2015 年的海拔变化，源自高分辨率数字高程模型
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发表时间：
2018
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通讯作者：
M. Zemp
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作者：
Luisa von Albedyll;H. Machguth;S. U. Nussbaumer;M. Zemp
格陵兰岛的边缘冰川和冰帽是北极气候变化的关键指标，但它们最近演变的定量观测数据却很少。最近发布的三个高分辨率数字高程模型（DEM）-AeroDEM（基于1978 - 1987年的图像），ArcticDEM（2012-2015）和TanDEM-X（2010-2014）-提供了计算格陵兰冰盖边缘近四十年来高程变化的可能性。本研究探讨了这些DEM的潜力，通过计算海拔变化的霍尔姆土地冰帽（865平方公里），格陵兰岛东北部。共配准表明DEM之间没有明显的变化，但我们在AeroDEM中遇到了局部垂直偏移。ArcticDEM和TanDEM-X的数据质量很高，但AeroDEM有19%的低质量数据，这些数据被视为数据空洞。应用两种方法来填补ArcticDEM和AeroDEM之间的差异网格中的数据空白，霍尔姆陆地冰帽的平均表面高程变化和大约35 y的周期在−8.30 ±0.30 m的范围内。比较ArcticDEM和TanDEM-X揭示了2.54米的冰川高程差异，这可能部分与不同的检索技术（光学和SAR）。总体而言，DEM具有很好的潜力，大规模和长期的大地冰川质量平衡评估。
ABSTRACT Greenland’s peripheral glaciers and ice caps are key indicators of climate change in the Arctic, but quantitative observational data of their recent evolution are sparse. Three recently released high-resolution digital elevation models (DEMs)—AeroDEM (based on images from 1978 to 1987), ArcticDEM (2012–2015), and TanDEM-X (2010–2014)—provide the possibility to calculate elevation changes spanning almost four decades along the margins of the Greenland Ice Sheet. This study explores the potential of these DEMs by calculating elevation changes for the Holm Land Ice Cap (865 km2), northeast Greenland. Co-registration indicated no significant shifts between the DEMs but we encountered localized vertical offsets in AeroDEM. The data quality of ArcticDEM and TanDEM-X is high, but AeroDEM suffers from 19 percent low-quality data, which were treated as data voids. Applying two approaches to fill the data voids in the difference grid between ArcticDEM and AeroDEM, mean surface-elevation change over the Holm Land Ice Cap and a period of approximately 35 y is in the range of −8.30 ±0.30 m. Comparing ArcticDEM and TanDEM-X reveals a glacier elevation difference of 2.54 m, which may be partly related to the different retrieval techniques (optical and SAR). Overall, the DEMs have good potential for large-scale and long-term assessment of geodetic glacier mass balance.