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Termini of calving glaciers as self-organized critical systems
CSC–IT Centre for Science.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (ICE group)
Finnish Meteorological Institute.
Institute of Arctic and Alpine Research, University of Colorado.
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2014 (English)In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 7, no 12, 874-878 p.Article in journal (Refereed) Published
Abstract [en]

Over the next century, one of the largest contributions to sea level rise will come from ice sheets and glaciers calving ice into the ocean1. Factors controlling the rapid and nonlinear variations in calving fluxes are poorly understood, and therefore difficult to include in prognostic climate-forced land-ice models. Here we analyse globally distributed calving data sets from Svalbard, Alaska (USA), Greenland and Antarctica in combination with simulations from a first-principles, particle-based numerical calving model to investigate the size and inter-event time of calving events. We find that calving events triggered by the brittle fracture of glacier ice are governed by the same power-law distributions as avalanches in the canonical Abelian sandpile model2. This similarity suggests that calving termini behave as self-organized critical systems that readily flip between states of sub-critical advance and super-critical retreat in response to changes in climate and geometric conditions. Observations of sudden ice-shelf collapse and tidewater glacier retreat in response to gradual warming of their environment3 are consistent with a system fluctuating around its critical point in response to changing external forcing. We propose that self-organized criticality provides a yet unexplored framework for investigations into calving and projections of sea level rise.

Place, publisher, year, edition, pages
2014. Vol. 7, no 12, 874-878 p.
Keyword [en]
Cryospheric science, Calving process, Calving events size and frequency, Earth science modelling, Self-organised critical systems, Calving model
National Category
Geosciences, Multidisciplinary Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-239421DOI: 10.1038/ngeo2290ISI: 000345915300013OAI: oai:DiVA.org:uu-239421DiVA: diva2:774430
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Svali - NoCE
Available from: 2014-12-22 Created: 2014-12-22 Last updated: 2017-11-27

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Vallot, DorothéeMoore, John

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