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(Article of periodic en Anglais - 2014)

Document title

Perennial frost blisters of the outer Mackenzie Delta, western Arctic coast, Canada

Authors(s) and Affiliation(s)

MORSE P.D. (1) ; BURN C.R. (1) ;
(1) Dept. of Geography and Environmental Studies, Carleton Univ., Ottawa, CANADA

Abstract

Saturated floodplains in Arctic deltas provide conditions favourable for frost mound growth. A case study is presented on low mounds in low-centred syngenetic ice-wedge polygons of Big Lake Delta Plain, outer Mackenzie Delta. In 2008 and 2009, 12 mounds were examined by drilling to describe their morphologic variations and to investigate their growth processes. Organic inclusions in the ice, bubble densities, electrical conductivity profiles, and ice-crystal structure indicated that the mounds were hydrostatic frost blisters. Up to 6 frost blisters were found within individual polygons due to the relatively small volume of water needed to create each mound. The frost blisters were perennial, with individuals remaining identifiable on aerial photographs and satellite images for up to 10 years. Frost blisters collapsed along dilation cracks opened by hydrostatic uplift and by thawing from their sides caused by snow drifting and water ponding. Cyclical growth and decay of the mounds may degrade the visible polygonal network over time

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2014, vol. 39, no2 [pp. 200-213]

Bibliographic references : 1 p.

Collation : 19 fig.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3439

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28518521 : Permanent link - XML version
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