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Dive into the research topics where Oscar Gustafsson is active.

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Featured researches published by Oscar Gustafsson.


Nature | 2012

Activation of old carbon by erosion of coastal and subsea permafrost in Arctic Siberia.

Jorien E. Vonk; Laura Sanchez-Garcia; B. E. van Dongen; Vanja Alling; Denis Kosmach; Alexander Charkin; Igor Semiletov; Oleg V. Dudarev; Natalia Shakhova; Patricia A. Roos; Timothy I. Eglinton; August Andersson; Oscar Gustafsson

The future trajectory of greenhouse gas concentrations depends on interactions between climate and the biogeosphere. Thawing of Arctic permafrost could release significant amounts of carbon into the atmosphere in this century. Ancient Ice Complex deposits outcropping along the ∼7,000-kilometre-long coastline of the East Siberian Arctic Shelf (ESAS), and associated shallow subsea permafrost, are two large pools of permafrost carbon, yet their vulnerabilities towards thawing and decomposition are largely unknown. Recent Arctic warming is stronger than has been predicted by several degrees, and is particularly pronounced over the coastal ESAS region. There is thus a pressing need to improve our understanding of the links between permafrost carbon and climate in this relatively inaccessible region. Here we show that extensive release of carbon from these Ice Complex deposits dominates (57 ± 2 per cent) the sedimentary carbon budget of the ESAS, the world’s largest continental shelf, overwhelming the marine and topsoil terrestrial components. Inverse modelling of the dual-carbon isotope composition of organic carbon accumulating in ESAS surface sediments, using Monte Carlo simulations to account for uncertainties, suggests that 44 ± 10 teragrams of old carbon is activated annually from Ice Complex permafrost, an order of magnitude more than has been suggested by previous studies. We estimate that about two-thirds (66 ± 16 per cent) of this old carbon escapes to the atmosphere as carbon dioxide, with the remainder being re-buried in shelf sediments. Thermal collapse and erosion of these carbon-rich Pleistocene coastline and seafloor deposits may accelerate with Arctic amplification of climate warming.


Atmospheric Chemistry and Physics | 2008

Source apportionment of elevated wintertime PAHs by compound-specific radiocarbon analysis

Rebecca J. Sheesley; Martin Kruså; Patricia Krecl; Christer Johansson; Oscar Gustafsson


Archive | 2003

Characterization of Siberian Arctic estuarine sediments: implications for terrestrial organic carbon transport

Liang Guo; Igor Semiletov; Oscar Gustafsson; Johan Ingri; Per Andersson; Oleg Dudarev; Derek White


Archive | 2003

Nd- and Sr isotopes in Siberian Arctic estuarine sediments: implications for sediment provenance

Per Andersson; Liang Guo; Igor Semiletov; Oscar Gustafsson; Johan Ingri; Oleg Dudarev; Derek White


Atmospheric Measurement Techniques Discussions | 2011

An algorithm for retrieving black carbon optical parameters from thermal-optical (OC/EC) instruments

August Andersson; Rebecca J. Sheesley; Elena N. Kirillova; Oscar Gustafsson


Archive | 2009

Sedimentation in the Lena river delta and adjacent part of the Laptev Sea

Alexander Charkin; Oleg Dudarev; Igor Semiletov; Jorien E. Vonk; Laura Sanchez-Garcia; Oscar Gustafsson; Per Andersson; Natalia Shakhova


Geochimica et Cosmochimica Acta | 2009

The importance of river water inflow and shelf sediment-sea water exchange in the East Siberian Sea for the Nd isotopic composition of Arctic Ocean water

Per Andersson; Don Porcelli; Johan Gelting; Fredrik Nordblad; Oscar Gustafsson; Igor Semiletov


Archive | 2010

On the Role of Missed Components of Carbon Cycling in the East Siberian Arctic Shelf

Igor Semiletov; Oleg Dudarev; M. A. Grigoriev; I. I. Pipko; Natalia Shakhova; Oscar Gustafsson; Laura Sanchez-Garcia; Vanja Alling; Jorien E. Vonk; Leif G. Anderson


Archive | 2010

On the early processing of terrestrial organic matter released to (sub-)Arctic coastal waters as deduced from biomarkers, isotopes and a simple model

Oscar Gustafsson; Jorien E. Vonk; Boudewijn F. Van Dongen; Oleg Dudarev; Igor Semiletov


Archive | 2010

Sedimentary Carbon Flux and Source Apportionment in the Laptev and East Siberian Sea: Strong Shelf Imprint of Old Organic Carbon from Coastal Erosion

Oscar Gustafsson; Jorien E. Vonk; Laura Sanchez-Garcia; Vanja Alling; Boudewijn F. Van Dongen; V. Mordukhovich; Alexander Charkin; Per Andersson; Igor Semiletov; Oleg Dudarev; Patricia A. Roos; Timothy I. Eglinton

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Igor Semiletov

Russian Academy of Sciences

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Oleg Dudarev

Russian Academy of Sciences

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Per Andersson

Swedish Museum of Natural History

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Alexander Charkin

Russian Academy of Sciences

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Natalia Shakhova

University of Alaska Fairbanks

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Johan Ingri

Luleå University of Technology

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