Estimating local surface glacier mass balance from migration of the 1918 Katla eruption tephra layer on Sléttjökull, southern Iceland

IF 2.5 4区 地球科学 Q2 GEOGRAPHY, PHYSICAL Annals of Glaciology Pub Date : 2023-03-06 DOI:10.1017/aog.2022.1
W. Hagg, C. Mayer, U. Münzer, Natalie Barbosa, Hans‐Martin Schuler, M. Staudacher
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Abstract

We use the apparent horizontal shift of an englacial tephra layer outcrop to calculate local glacier mass balance on Sléttjökull, a lobe of Mýrdalsjökull in Southern Iceland. For this approach, the dipping angle of the englacial tephra layer in the glacier upstream of the outcrop and the flow velocity of the ice need to be known. An earlier investigation was expanded by the application of ground-penetrating radar, detecting the depth of the tephra along tracks with a total length of 10 km. Interpolation between the tracks enables us to derive the dipping angle of the layer along several flow lines. Together with glacier surface velocities, determined from feature tracking, we are able to estimate the local surface mass balance from the horizontal displacement of the tephra outcrop using freely available satellite imagery without additional fieldwork. The earlier local balance series was extended to the period 2014/15 to 2019/20. Although the results for the individual profiles differ slightly from each other, they show the same temporal pattern and clear variations from year to year. The results are compared to traditional mass-balance data from Hofsjökull. The two series show a good agreement in their interannual variability.
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从冰岛南部Sléttjökull上1918年Katla火山喷发火山层的迁移估算当地地表冰川物质平衡
我们使用英层露头的明显水平位移来计算冰岛南部Mýrdalsjökull的一个凸起Sléttjökull上的当地冰川质量平衡。对于这种方法,需要知道露头上游冰川中英层的倾角和冰的流速。早期的调查通过应用探地雷达进行了扩展,探测了沿总长10公里的轨道的火山灰层深度。轨道之间的插值使我们能够得出沿几条流线的地层倾角。再加上通过特征跟踪确定的冰川表面速度,我们能够在没有额外实地调查的情况下,使用免费提供的卫星图像,根据tephra露头的水平位移来估计当地表面质量平衡。早期的本地余额系列延长至2014/15年至2019/20年。尽管各个剖面的结果略有不同,但它们显示出相同的时间模式和明显的逐年变化。将结果与Hofsjökull的传统质量平衡数据进行了比较。这两个序列在年际变化方面表现出良好的一致性。
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来源期刊
Annals of Glaciology
Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
8.20
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.
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