Journal cover Journal topic
Earth System Science Data The Data Publishing Journal
https://doi.org/10.5194/essd-2017-59
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
 
06 Jul 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Science Data (ESSD).
Modulation of glacier ablation by tephra coverage from Eyjafjallajökull and Grimsvötn volcanoes, Iceland: an automated field experiment
Rebecca Möller1,2, Marco Möller1,3, Peter A. Kukla2, and Christoph Schneider3 1Department of Geography, RWTH Aachen University, Aachen, Germany
2Geological Institute, Energy and Minerals Resources Group, RWTH Aachen University, Aachen, Germany
3Geography Department, Humboldt-Universität zu Berlin, Germany
Abstract. This Article reports results from a field experiment investigating the influence of volcanic tephra coverage on glacier ablation. These influences are known to be significantly different from those of moraine debris on glaciers due to the contrasting grain size distribution and thermal conductivity. Influences of tephra deposits on glacier ablation have hardly been studied so far. For the experiment, artificial plots of two different tephra types from Eyjafjallajökull and Grimsvötn volcanoes were installed on a snow-covered glacier surface of Vatnajökull ice cap, Iceland.Ablation was automatically monitored along with atmospheric variables and ablation on a non-tephra covered reference site over the summer season 2015. For each of the two volcanic tephra types, three plots (~ 1.5 mm, ~ 8.5 mm and ~ 80 mm) were monitored. After limiting the records to a period of reliable measurements, a 50-days dataset of hourly records was obtained, which can be downloaded from the Pangaea data repository (https://www.pangaea.de; https://doi.org/10.1594/PANGAEA.876656). The experiment shows a substantial increase of ablation under the ~ 1.5 mm and ~ 8.5 mm tephra plots when compared to uncovered conditions. Only under the thick tephra cover some insulating effects could be observed. This result is in contrast to other studies which depicted insulating effects for much thinner tephra coverson bare-ice glacier surfaces. Differences between the influences of the two different petrological types of tephra exist but are small.

Citation: Möller, R., Möller, M., Kukla, P. A., and Schneider, C.: Modulation of glacier ablation by tephra coverage from Eyjafjallajökull and Grimsvötn volcanoes, Iceland: an automated field experiment, Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2017-59, in review, 2017.
Rebecca Möller et al.
Rebecca Möller et al.

Data sets

Meteorological observations and ablation characteristics during the TIOGA experiment on Iceland in 2015
R. Möller, M. Möller, P. A. Kukla, and C. Schneider
https://doi.org/10.1594/PANGAEA.876656
Rebecca Möller et al.

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