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|a Activation of old carbon by erosion of coastal and subsea permafrost in Arctic Siberia |h [electronic resource]. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2012-09-06. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a 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
unknown9–11. Recent Arctic warming is stronger than has been
predicted by several degrees, and is particularly pronounced over
the coastal ESAS region12,13. 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 (5762 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
44610 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
(66616 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 |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15042528/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/04/25/28/00001/FI15042528_thm.jpg |
