2013
DOI: 10.1073/pnas.1307031110
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Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins

Abstract: Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect is challenging to assess due to the diverse processes controlling the release of various organic carbon (OC) pools from heterogeneous Arctic landscapes. Here, by radiocarbon dating various terrestrial OC components in fluvially and coastally integrated estuarine sediments, we present a unique framework for deconvoluting the contrasting mobilization mechanisms of surface vs. deep (permafrost) carb… Show more

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Cited by 195 publications
(245 citation statements)
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“…Nevertheless, field data show that NPP in the highly productive Chukchi Sea is one to two orders of magnitude higher (up to 200-400 g C m −2 yr −1 ) than in the oligotrophic Laptev Sea and western part of the East Siberian Sea (Walsh et al, 1989;Sorokin and Sorokin, 1996). Thus, the proposed NPP increase based on interpretation of satellite data must be validated with observational data (Heim et al, 2013;Fichot et al, 2013). Meanwhile, the observed increase in the Lena River discharge of up to 37 % (2008) since the 1990s suggests that increased levels of annual primary production could be explained by an increasing load of humic acids delivered to shelf water; the color resulting from the presence of CDOM in this water mimics the color resulting from the presence of Chl a when seen from space.…”
Section: Biogeosciencesmentioning
confidence: 99%
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“…Nevertheless, field data show that NPP in the highly productive Chukchi Sea is one to two orders of magnitude higher (up to 200-400 g C m −2 yr −1 ) than in the oligotrophic Laptev Sea and western part of the East Siberian Sea (Walsh et al, 1989;Sorokin and Sorokin, 1996). Thus, the proposed NPP increase based on interpretation of satellite data must be validated with observational data (Heim et al, 2013;Fichot et al, 2013). Meanwhile, the observed increase in the Lena River discharge of up to 37 % (2008) since the 1990s suggests that increased levels of annual primary production could be explained by an increasing load of humic acids delivered to shelf water; the color resulting from the presence of CDOM in this water mimics the color resulting from the presence of Chl a when seen from space.…”
Section: Biogeosciencesmentioning
confidence: 99%
“…POC represents an earlier phase of OM transformation associated with poorly defined compositional changes such as aggregation/disaggregation of particles, incorporation of older and more degraded material, and recombination of organic compounds (Cooper et al, 2005). In the BKB, major POC sources include soil and yedoma- borne terrestrial OC and OC mobilized to the water column by coastal and bottom erosion Karlsson et al, 2011;Feng et al, 2013).…”
Section: Biogeochemical Signatures Of Organic Matter Degradation In Smentioning
confidence: 99%
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“…Because of sizeable carbon storage in frozen soils of Siberia (Botch et al, 1995;Krementski et al, 2003;Frey and Smith, 2007;Beilman et al, 2009;Tarnocai et al, 2009;Gentsch et al, 2015), the warming in this region is especially important for global projections of the carbon balance on the planet (Smith et al, 2004;Frey and Smith, 2005;Feng et al, 2013). In this regard, permafrostbearing part of Western Siberia Lowland (WSL) is highly sensitive to soil warming, due to (i) the dominance of discontinuous, sporadic, and intermittent permafrost coverage compared to continuous and discontinuous permafrost of central and eastern Siberia and Canada High Arctic; (ii) the surface layer temperature of the WSL permafrost is often between 0 and −2 • C, which is warmer than in other regions of the world (Romanovsky et al, 2010); (iii) essentially flat area of the WSL and high impact of flooding and thermokarst development; and, most importantly, (iv) high stock of ancient and recent organic carbon in the form of partially frozen peat deposits of 1 to 4 m thickness.…”
Section: Introductionmentioning
confidence: 99%