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Tidewater Glacier Surges Initiated at the Terminus
Univ St Andrews, Sch Geog & Sustainable Dev, St Andrews, Fife, Scotland.
Univ St Andrews, Sch Geog & Sustainable Dev, St Andrews, Fife, Scotland.
Swansea Univ, Dept Geog, Coll Sci, Swansea, W Glam, Wales;Univ Ctr Svalbard, Dept Arctic Geophys, Longyearbyen, Norway.
Univ Oslo, Fac Math & Nat Sci, Dept Geosci, Oslo, Norway.
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2018 (English)In: Journal of Geophysical Research - Earth Surface, ISSN 2169-9003, E-ISSN 2169-9011, Vol. 123, no 5, p. 1035-1051Article in journal (Refereed) Published
Abstract [en]

There have been numerous reports that surges of tidewater glaciers in Svalbard were initiated at the terminus and propagated up-glacier, in contrast with downglacier-propagating surges of land-terminating glaciers. Most of these surges were poorly documented, and the cause of this behavior was unknown. We present detailed data on the recent surges of two tidewater glaciers, Aavatsmarkbreen and Wahlenbergbreen, in Svalbard. High-resolution time series of glacier velocities and evolution of crevasse patterns show that both surges propagated up-glacier in abrupt steps. Prior to the surges, both glaciers underwent retreat and steepening, and in the case of Aavatsmarkbreen, we demonstrate that this was accompanied by a large increase in driving stress in the terminal zone. The surges developed in response to two distinct processes. (1) During the late quiescent phase, internal thermodynamic processes and/or retreat from a pinning point caused acceleration of the glacier front, leading to the development of terminal crevasse fields. (2) Crevasses allowed surface meltwater and rainwater to access the bed, causing flow acceleration and development of new crevasses up-glacier. Upward migration of the surge coincided with stepwise expansion of the crevasse field. Geometric changes near the terminus of these glaciers appear to have led to greater strain heating, water production, and storage at the glacier bed. Water routing via crevasses likely plays an important role in the evolution of surges. The distinction between internally triggered surges and externally triggered speedups may not be straightforward. The behavior of these glaciers can be understood in terms of the enthalpy cycle model.

Place, publisher, year, edition, pages
AMER GEOPHYSICAL UNION , 2018. Vol. 123, no 5, p. 1035-1051
Keywords [en]
glaciers, surges, tidewater, Svalbard, remote sensing, dynamics
National Category
Physical Geography
Identifiers
URN: urn:nbn:se:uu:diva-358100DOI: 10.1029/2017JF004358ISI: 000435277100011OAI: oai:DiVA.org:uu-358100DiVA, id: diva2:1241638
Funder
EU, European Research Council, 320816Available from: 2018-08-24 Created: 2018-08-24 Last updated: 2018-08-24Bibliographically approved

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