Historical records of organic matter supply and degradation status in the East Siberian Sea

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Bröder, LisaStockholms universitet,Institutionen för miljövetenskap och analytisk kemi (author)

Historical records of organic matter supply and degradation status in the East Siberian Sea

Article/chapterEnglish2016

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Elsevier BV,2016
printrdacarrier

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LIBRIS-ID:oai:DiVA.org:su-126195
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-126195URI
https://doi.org/10.1016/j.orggeochem.2015.10.008DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

Destabilization and degradation of permafrost carbon in the Arctic regions could constitute a positive feedback to climate change. A better understanding of its fate upon discharge to the Arctic shelf is therefore needed. In this study, bulk carbon isotopes as well as terrigenous and marine biomarkers were used to construct two centennial records in the East Siberian Sea. Differences in topsoil and Pleistocene Ice Complex Deposit permafrost concentrations, modeled using delta C-13 and Delta C-14, were larger between inner and outer shelf than the changes over time. Similarly, lignin-derived phenol and cutin acid concentrations differed by a factor of ten between the two stations, but did not change significantly over time, consistent with the dual-carbon isotope model. High molecular weight (HMW) n-alkane and n-alkanoic acid concentrations displayed a smaller difference between the two stations (factor of 3-6). By contrast, the fraction for marine OC drastically decreased during burial with a half-life of 19-27 years. Vegetation and degradation proxies suggested supply of highly degraded gymnosperm wood tissues. Lipid Carbon Preference Index (CPI) values indicated more extensively degraded HMW n-alkanes on the outer shelf with no change over time, whereas n-alkanoic acids appeared to be less degraded toward the core top with no large differences between the stations. Taken together, our results show larger across-shelf changes than down-core trends. Further investigation is required to establish whether the observed spatial differences are due to different sources for the two depositional settings or, alternatively, a consequence of hydrodynamic sorting combined with selective degradation during cross-shelf transport.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
Arctic
East Siberian Arctic Shelf
Pb-210
Monte Carlo
delta C-13
Delta C-14
Lignin
HMW wax lipids
Applied Environmental Science
tillämpad miljövetenskap

Added entries (persons, corporate bodies, meetings, titles ...)

Tesi, TommasoStockholms universitet,Institutionen för miljövetenskap och analytisk kemi,CNR-National Research Council of Italy, ISMAR-Marine Sciences Institute, Italy(Swepub:su)ttesi (author)
Andersson, AugustStockholms universitet,Institutionen för miljövetenskap och analytisk kemi(Swepub:su)auand (author)
Eglinton, Timothy I. (author)
Semiletov, Igor P. (author)
Dudarev, Oleg V. (author)
Roos, Per (author)
Gustafsson, ÖrjanStockholms universitet,Institutionen för miljövetenskap och analytisk kemi(Swepub:su)ogust (author)
Stockholms universitetInstitutionen för miljövetenskap och analytisk kemi (creator_code:org_t)

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In:Organic Geochemistry: Elsevier BV91, s. 16-300146-63801873-5290

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NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...

Articles in the publication: Organic Geochemi ...

By the university: Stockholm University

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