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Dynamic response of a High Arctic glacier to melt and runoff variations
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (Ice and Climate)
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
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2018 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, no 10, p. 4917-4926Article in journal (Refereed) Published
Abstract [en]

The dynamic response of High Arctic glaciers to increased runoff in a warming climateremains poorly understood. We analyze a 10-year record of continuous velocity data collected atmultiple sites on Nordenskiöldbreen, Svalbard, and study the connec tion between ice flow andrunoff within and between seasons. During the melt season, the sensitivit y of ice motion to runoffat sites in the ablation and lower accumulation zone drops by a fac tor of 3 when cumulative runoff exceedsa local threshold, which is likely associated with a transition from inefficient (distributed) to efficient(channelized) drainage. Average summer (June–August) velocities are found to increase with summerablation, while subsequent fall (September–November) velocities decrease. Spring (March–May)velocities are largely insensitive to summer ablation, which suggests a short-lived impact of summermelt on ice flow during the cold season. The net impact of summer ablation on annual velocities is foundto be insignificant.

Place, publisher, year, edition, pages
2018. Vol. 45, no 10, p. 4917-4926
Keywords [en]
glacier, runoff, velocity, climate change
National Category
Physical Geography
Identifiers
URN: urn:nbn:se:uu:diva-350228DOI: 10.1029/2018GL077252OAI: oai:DiVA.org:uu-350228DiVA, id: diva2:1204489
Funder
Swedish Research CouncilSwedish Polar Research SecretariatAvailable from: 2018-05-08 Created: 2018-05-08 Last updated: 2018-08-24Bibliographically approved

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Van Pelt, Ward J.J.Pohjola, Veijo A.Pettersson, Rickard

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