Biogeochemistry of the Russian Arctic. Kara Sea: Research results under the SIRRO project, 1995–2003

Галимов, Э. М.; Kodina, L. A.; Stepanets, Oleg; Korobeinik, G S

doi:10.1134/s0016702906110012

Cited by 89 publications

(25 citation statements)

References 23 publications

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“…Both of these plant-derived components likely consist of OC that was in long-term storage in permafrost or peats, with the component in the surface layers having incorporated some additional, young plant OC that contains bomb 14 C, which causes the measured signature to become more positive. The d 13 C signature is more depleted than is usual for C 3 plants (Sharp, 2007), although Galimov et al (2006) estimated depleted d 13 C values for terrigenous OC in the nearby Yenisey River system of À27.2& to À29.1&, values that are more depleted than most plants, though still enriched versus our estimate. The aquatic endmember for both surface and "mixing" layers has a modern radiocarbon signature (D 14 C init = +77.9& and +106.1&, respectively) and a relatively enriched d 13 C value (À27.8&) in the mixing layers.…”

Section: Mixing Of Oc Sources In Sedimentscontrasting

confidence: 48%

“…The Ob' River exports 3.69 Â 10 6 t/year total OC (TOC; Telang et al, 1991), with about 90% of this TOC being DOC and only 10% POC (0.36 Â 10 6 t/year; Rachold et al, 2004;Galimov et al, 2006). However, export of sediments from Siberian rivers is predicted to increase by 30-122% by 2100 (Gordeev, 2006), which should also increase export of POC (Gordeev and Kravchishina, 2009).…”

Section: Study Sitementioning

confidence: 93%

“…The river also carries "flotsam" from the extensive peat bogs upstream (Walker, 1998). The algal community in the freshwater reaches of the estuary consists primarily of diatoms and green algae (Galimov et al, 2006), which may be similar to the organisms growing in the river or floodplain lakes. Fossil sources of OC (kerogen) appear to be minimal in this river system (van Dongen et al, 2008), presumably because the long storage times of sediments in intermediate floodplains and marshes (Meade et al, 2000;Gordeev, 2006) facilitate loss of such OC from the sedimentary matrix (e.g., Blair et al, 2004).…”

Section: Study Sitementioning

confidence: 99%

“…POC in the Ob' River is presumed to derive mostly from plants and soils (Rachold et al, 2004), although few studies have addressed this question directly for this river. Galimov et al (2006) used stable carbon isotopes to estimate that 70% of the POC in the nearby Yenisey River derived from terrigenous sources, with the remaining 30% from algae. Likewise, Fernandes and Sicre (2000) estimated that shelf sediments offshore from the Ob' contained 70% terrigenous carbon based on higher plant wax n-alkane concentrations, whereas Unger et al (2005) found low C/N ratios of suspended sediments near the river mouth collected in June and inferred that the riverine POC derived from primarily algal sources.…”

Section: Study Sitementioning

confidence: 99%

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A depositional history of particulate organic carbon in a floodplain lake from the lower Ob’ River, Siberia

Dickens

Baldock

Kenna

et al. 2011

Geochimica et Cosmochimica Acta

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Section: Mixing Of Oc Sources In Sedimentscontrasting

confidence: 48%

Section: Study Sitementioning

confidence: 93%

Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

See 2 more Smart Citations

A depositional history of particulate organic carbon in a floodplain lake from the lower Ob’ River, Siberia

Dickens

Baldock

Kenna

et al. 2011

Geochimica et Cosmochimica Acta

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“…With respect to CH 4 , it is likely that rivers are at or above equilibrium with the atmosphere and that higher concentrations are obtained during ice cover. Assuming river concentrations of 10-200 nmol/L (Semiletov et al 1996, Galimiov et al 2006, together with a total river inflow of 3253 km 3 /yr , implies an input of 1 to 11 Gg CH 4 /yr to the Arctic Ocean from rivers. River plumes may be locally important for CH 4 surface concentrations (e.g., see Shakhova et al 2005, Shakhova andSemiletov 2007), but they contribute little to the Arctic Ocean budget.…”

Section: Lateral Fluxes and Fates Of Doc Dic Poc And Chmentioning

confidence: 99%

Sensitivity of the carbon cycle in the Arctic to climate change

McGuire

Anderson

Christensen

et al. 2009

Ecological Monographs

897

784

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Abstract. The recent warming in the Arctic is affecting a broad spectrum of physical, ecological, and human/cultural systems that may be irreversible on century time scales and have the potential to cause rapid changes in the earth system. The response of the carbon cycle of the Arctic to changes in climate is a major issue of global concern, yet there has not been a comprehensive review of the status of the contemporary carbon cycle of the Arctic and its response to climate change. This review is designed to clarify key uncertainties and vulnerabilities in the response of the carbon cycle of the Arctic to ongoing climatic change. While it is clear that there are substantial stocks of carbon in the Arctic, there are also significant uncertainties associated with the magnitude of organic matter stocks contained in permafrost and the storage of methane hydrates beneath both subterranean and submerged permafrost of the Arctic. In the context of the global carbon cycle, this review demonstrates that the Arctic plays an important role in the global dynamics of both CO 2 and CH 4 . Studies suggest that the Arctic has been a sink for atmospheric CO 2 of between 0 and 0.8 Pg C/yr in recent decades, which is between 0% and 25% of the global net land/ocean flux during the 1990s. The Arctic is a substantial source of CH 4 to the atmosphere (between 32 and 112 Tg CH 4 /yr), primarily because of the large area of wetlands throughout the region. Analyses to date indicate that the sensitivity of the carbon cycle of the Arctic during the remainder of the 21st century is highly uncertain. To improve the capability to assess the sensitivity of the carbon cycle of the Arctic to projected climate change, we recommend that (1) integrated regional studies be conducted to link observations of carbon dynamics to the processes that are likely to influence those dynamics, and (2) the understanding gained from these integrated studies be incorporated into both uncoupled and fully coupled carbon-climate modeling efforts.

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Different sources and degradation state of dissolved, particulate, and sedimentary organic matter along the Eurasian Arctic coastal margin

Karlsson

Gelting

Tesi

et al. 2016

Global Biogeochemical Cycles

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Thawing Arctic permafrost causes massive fluvial and erosional releases of dissolved and particulate organic carbon (DOC and POC) to coastal waters. Here we investigate how different sources and degradation of remobilized terrestrial carbon may affect large‐scale carbon cycling, by comparing molecular and dual‐isotope composition of waterborne high molecular weight DOC (>1 kD, aka colloidal OC), POC, and sedimentary OC (SOC) across the East Siberian Arctic Shelves. Lignin phenol fingerprints demonstrate a longitudinal trend in relative contribution of terrestrial sources to coastal OC. Wax lipids and cutins were not detected in colloidal organic carbon (COC), in contrast to POC and SOC, suggesting that different terrestrial carbon pools partition into different aquatic carrier phases. The Δ14C signal suggests overwhelmingly contemporary sources for COC, while POC and SOC are dominated by old C from Ice Complex Deposit (ICD) permafrost. Monte Carlo source apportionment (δ13C, Δ14C) constrained that COC was dominated by terrestrial OC from topsoil permafrost (65%) and marine plankton (25%) with smaller contribution ICD and other older permafrost stocks (9%). This distribution is likely a result of inherent compositional matrix differences, possibly driven by organomineral associations. Modern OC found suspended in the surface water may be more exposed to degradation, in contrast to older OC that preferentially settles to the seafloor where it may be degraded on a longer timescale. The different sources which partition into DOC, POC, and SOC appear to have vastly different fates along the Eurasian Arctic coastal margin and may possibly respond on different timescales to climate change.

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Biogeochemistry of the Russian Arctic. Kara Sea: Research results under the SIRRO project, 1995–2003

Cited by 89 publications

References 23 publications

A depositional history of particulate organic carbon in a floodplain lake from the lower Ob’ River, Siberia

A depositional history of particulate organic carbon in a floodplain lake from the lower Ob’ River, Siberia

Sensitivity of the carbon cycle in the Arctic to climate change

Different sources and degradation state of dissolved, particulate, and sedimentary organic matter along the Eurasian Arctic coastal margin

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