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(Article of periodic en Anglais - 2014)

Document title

Characterisation of three regimes of collapsing arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes

Authors(s) and Affiliation(s)

SÁNCHEZ-GARCÍA L. (1) ; VONK J.E. (1) ; CHARKIN A.N. (2 4) ; KOSMACH D. (2 4) ; DUDAREV O.V. (2 4) ; SEMILETOV I.P. (2 3 4) ; GUSTAFSSON Ö. (1) ;
(1) Dept. of Applied Environmental Science (ITM), Univ., Stockholm, SUEDE
(2) Pacific Oceanological Inst., Russian Academy of Sciences, Vladivostok, RUSSIE, FEDERATION DE
(3) International Arctic Research Center (IARC), Univ. of Alaska, Fairbanks, ETATS-UNIS
(4) National Research Tomsk Polytechnic Univ., Tomsk, RUSSIE, FEDERATION DE

Abstract

This study identifies signs of organic carbon (OC) degradation in 3 Siberian Ice Complex Deposits (ICD) regimes of coastal erosion through elemental, isotopic and molecular analyses. The degree of erosion appears to determine the extent of degradation. The moisture-limited and beach-protected ICD bluff near Buor-Khaya Cape, characterised by thermokarst mounds (baydzherakhs), represents a dormant regime with limited ongoing degradation. Conversely, the more exposed ICD scarps on eroding riverbanks (Olenek Channel, Lena Delta) and coastal slopes (Muostakh Island) showed more pronounced signs of ongoing OC decay. Different parameters suggest that degradation can partially explain the shift of the OC signature with 14C age in the thawing ICD. Exposure time, degree of erosion, slope gradient and moisture conditions appear to be key factors determining the degradation propensity of OC in exposed ICD. These field results document the lability of OC in ICD upon thaw and illustrate the potential for transferring old OC into the rapidly cycling atmosphere-biosphere carbon pools

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. 172-183]

Bibliographic references : 2 p.

Collation : 4 fig., 4 tabl.

Language

Anglais

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/ppp.1815

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