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(Article of periodic en Anglais - 2014)

Document title

Quantifying wedge-ice volumes in Yedoma and thermokarst basin deposits

Authors(s) and Affiliation(s)

ULRICH M. (1) ; GROSSE G. (2 3) ; STRAUSS J. (3) ; SCHIRRMEISTER L. (3) ;
(1) Inst. for Geography, Univ., Leipzig, ALLEMAGNE
(2) Geophysical Inst., Univ. Alaska, Fairbanks, ETATS-UNIS
(3) Alfred Wegener Inst., Helmholtz center for Polar and Marine Research, Potsdam, ALLEMAGNE

Abstract

The AA. present a method for calculating wedge-ice volume (WIV) in late Pleistocene Yedoma deposits and Holocene thermokarst basin deposits at 4 study areas in Siberia and Alaska. Ice-wedge polygons and thermokarst mound (baydzherakh) patterns were mapped on different landscape units using very high-resolution (0.5 m/pixel) satellite imagery (WorldView-1 and GeoEye-1). In a geographic information system (GIS) environment, Thiessen polygons were automatically created to reconstruct relict ice-wedge polygonal networks, and field and published data on ice-wedge dimensions were used to generate three-dimensional subsurface models that distinguish between epi- and syngenetic ice-wedge geometry. The results reveal significant variations in WIV between the study sites and within certain terrain units. Calculated maximum WIV ranges from 31.4 to 63.2 vol% for Yedoma deposits and from 6.6 to 13.2 vol% for thermokarst basin deposits

Source

Article of periodic

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

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

Millesime : 2014, vol. 25, no3 [pp. 151-161]

Bibliographic references : 1 p.

Collation : 7 fig., 2 tabl.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1810

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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