Journal
PERMAFROST AND PERIGLACIAL PROCESSES
Volume 27, Issue 2, Pages 204-218Publisher
WILEY
DOI: 10.1002/ppp.1870
Keywords
permafrost; mud ejections; climate; active-layer dynamics; remote sensing; permafrost disturbance
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada Frontiers Arctic Development and Adaptation to Permafrost in Transition
- ArcticNet
- Northern Scientific Training Program
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Pressurised slurries of fine-grained sediment expelled from the base of the active layer have been observed in recent years in the High Arctic. Such mud ejections, however, are poorly understood in terms of how exactly climate and landscape factors determine when and where they occur. Mud ejections at the Cape Bounty Arctic Watershed Observatory, Melville Island, Nunavut, were systematically mapped in 2012 and 2013, and this was combined with observations of mud ejection activity and climatic measurements carried out since 2003. The mud ejections occur late in the melt season during warm years and closely following major rainfall events. High-resolution satellite imagery demonstrates that mud ejections are associated with polar semi-desert vegetative settings, flat or low-sloping terrain and south-facing slopes. The localised occurrence of mud ejections appears to be related to differential soil moisture retention. Copyright (c) 2015 John Wiley & Sons, Ltd.
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