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(Article of periodic en Anglais - 2012)

Document title

A 2D model for characterising first-order variability in sublimation of buried glacier ice, Antarctica : assessing the influence of polygon troughs, desert pavements and shallow subsurface salts

Authors(s) and Affiliation(s)

KOWALEWSKI D.E. (1) ; MARCHANT D.R. (1) ; HEAD J.W. (2) ; JACKSON D.W. (1) ;
(1) Dep. of Earth Sciences, Univ., Boston, ETATS-UNIS
(2) Dep. of Geological Sciences, Brown Univ., Providence, ETATS-UNIS

Abstract

To assess the role of thermal contraction-crack polygons (sublimation polygons) in modulating sublimation of buried glacier ice in Antarctica, the AA. applied a 2D numerical model using COMSOL Multiphysics that calculates the rate and spatial variability of vapour diffusion through porous media. Specifically, they examined vapour transport through Granite drift, a dry supraglacial till marked with thermal contraction-crack polygons that rests on glacier ice reportedly >8-million years in age. The model results show that sublimation varies with drift texture and surface topography. The importance of including field-based data for drift texture, topography and microclimate variation in modelling ice sublimation is highlighted. The results also suggest that stable conditions (no ice loss) at polygon centres are possible with either a 1.9°C decrease in mean annual atmospheric temperature or a 12 per cent increase in mean annual relative humidity

Source

Article of periodic

published at : Permafrost and periglacial processes / ISSN 1045-6740 / CODEN PEPPED

Editor : Wiley, Chichester - ROYAUME-UNI (1990)

Millesime : 2012, vol. 23, no1 [pp. 1-14]

Bibliographic references : 44 ref.

Collation : 10 fig., 2 tabl.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.731

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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