Assessing the importance of terrestrial organic carbon in the CHUKCHI and Beaufort seas

Morris, David Jackson; O'connell, M. T.; Macko, Stephen A.

doi:10.1016/j.ecss.2015.06.011

Cited by 12 publications

(3 citation statements)

References 79 publications

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“…If we examined the solid phase δ 13 C‐TOC values alone in the surface sediments, there was a narrow range of δ 13 C (−22.1‰ to −23.1‰) for TOC. This result could suggest the deposition of a large fraction of marine‐derived OM on the inner shelf and slope region of the Arctic Ocean in past decades, as reported recently (Astakhov et al, ; Morris et al, ). The rapid degradation of the newly deposited OC could have resulted in the accumulation of more refractory terrestrial TOC preserved at depth in the sediments.…”

Section: Discussionsupporting

confidence: 73%

Production of Ancient Dissolved Organic Carbon in Arctic Ocean Sediment: A Pathway of Carbon Cycling in the Extreme Environment

Liu

et al. 2020

Geophysical Research Letters

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We report quantitative carbon isotope evidence showing that porewater dissolved organic carbon (DOC) is produced from different sources in Arctic Ocean sediments, resulting in dramatic changes in both δ13C and Δ14C values of DOC. The very low δ13C (−42.7‰) and Δ14C (−947‰) values measured for porewater DOC indicate that bacteria consume methane hydrate‐derived OC and convert a significant fraction of this δ13C depleted and old OC (44–97%) into DOC in the sediments of the Arctic Ocean. We suggest that the production of extremely old, methane‐derived porewater DOC (5,430–23,600 years) in Arctic Ocean sediment is an important pathway for carbon cycling that provides not only a necessary energy source for microbial communities in this extreme environment but also an ancient DOC source that could flux and contribute to the old and biologically recalcitrant DOC found in the deep ocean.

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Section: Discussionsupporting

confidence: 73%

Production of Ancient Dissolved Organic Carbon in Arctic Ocean Sediment: A Pathway of Carbon Cycling in the Extreme Environment

Liu

et al. 2020

Geophysical Research Letters

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“…End‐member mixing models developed by Thornton and McManus () and further developed by Gordon and Goni () provide a quantitative framework to assess the relative inputs of OC terr and OC mar into marine sediments. These techniques have been furthered by the introduction of Markov chain Monte Carlo (MCMC) methodologies (Li et al, ) and standalone Bayesian isotope mixing models (Arendt et al, ; Morris et al, ). These mixing models use elemental ratios and stable isotope values to separate the terrestrial and marine components; OC terr is isotopically lighter and has a high C:N ratio in comparison to OC mar (Bauer et al, ; Meyers, ; Peter et al, 1978; Redfield et al, ).…”

Section: Methodsmentioning

confidence: 99%

Sources, Sinks, and Subsidies: Terrestrial Carbon Storage in Mid‐latitude Fjords

Smeaton

Austin

2017

JGR Biogeosciences

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Fjords are recognized as globally important sites for the burial and long‐term storage of carbon (C) within sediments. The proximity of fjords to the terrestrial environment in combination with their geomorphology and hydrography results in the fjordic sediments being subsidized with organic carbon (OC) from the terrestrial environment. It has been well documented that terrestrial OC (OCterr) is an important component of coastal sediments, yet our understanding of the quantity of OCterr stored in these sediments remains poorly constrained. Utilizing Bayesian isotopic sediment fingerprinting techniques to the surface sediments of Loch Sunart, we estimate that 42.0 ± 10.1% of the OC is terrestrial in origin. Through combining these outputs with sedimentary OC stock estimates, we have calculated that the surface sediments (0–15 cm) hold 0.1 megaton (Mt) OCterr and estimate that the postglacial sediment held within the fjord contains 3.96 Mt OCterr. When these totals are compared to the quantity of OC stored in the adjacent terrestrial environment, it is clear that the fjord's catchment stores a greater amount of OCterr in the form of vegetation and soil. Though when normalized for area the results suggest that the marine sediments are a more effective long‐term store of OCterr than the adjacent terrestrial environment. This striking result highlights the importance of the terrestrial environment as a source of OC to the coastal ocean and that the OCterr subsidy to the marine sediments is a significant mechanism for the long‐term storage of OC in coastal marine sediments.

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“…Низкие значения этого показателя в зообентосе (сопоставимые с зоопланктоном) в западной части моря, с одной стороны, указывают на зависимость бентоса от продукции из пелагиали, с другой -связаны с увеличением доли терригенного органического вещества. Такая же ситуация отмечена и для западной Арктики, где источником органического вещества донных осадков является на 50-70 % продукция фитопланктона пелагиали, на 25-35 % -продукция ледового цветения и 15 % углерода продуцируется с осадками терригенного происхождения [Morris et al, 2015] 3), варьируют от 15,2 до 19,3 ‰ и от -20,8 до -15,9 ‰ (табл. 3), что свидетельствует о значительном разнообразии способов питания и состава рационов.…”

Section: результаты и их обсуждениеunclassified

Trophic characteristics of zooplankton and zoobenthos in certain water masses in the western Chukchi Sea, by δ<sup>15</sup>N and δ<sup>13</sup>С data

Gorbatenko,

Melnikov

2023

Izv. Tihookean. naučno-issled. rybohoz. centra

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To compare trophic characteristics for pelagic and bottom communities of zooplankton and zoobenthos in the western Chukchi Sea, isotopic composition of carbon and nitrogen (δ13С and δ15N) is determined for three different types of water masses. The main area of the southwestern part of the sea (to the south of 71оN) is occupied by the surface and subsurface water masses invaded from the Bering Sea with relatively high δ13C and low δ15N values. The cold Arctic waters prevail in the northwestern area. The western periphery of the sea is inﬂuenced by the water masses from the East Siberian Sea transported by the alongshore Siberian Current, distinguished by signiﬁcantly lowered δ13С values and somewhat (by 1–3 ‰) increased δ15N values. A stable difference in the carbon isotopic composition between zooplankton and benthic invertebrates is revealed in the southwestern Chukchi Sea that means that the benthic organisms are based mainly on the bottom food chain, with a minimal input of organic matter from the water column. In the area inﬂuenced by the water masses from the East Siberian Sea, benthic invertebrates have the lowest values of δ13С comparable to those of zooplankton that is a sign of organic sediments from the water column utilization, partly terrigenous in origin. The role of primary producers for plankton and benthos in the northwestern Chukchi Sea has not been fully elucidated and requires additional studies. However, the main trophic base for the benthic community is assumed there to be organic matter removed from the water column, originated mainly from ice algae.

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Assessing the importance of terrestrial organic carbon in the CHUKCHI and Beaufort seas

Cited by 12 publications

References 79 publications

Production of Ancient Dissolved Organic Carbon in Arctic Ocean Sediment: A Pathway of Carbon Cycling in the Extreme Environment

Production of Ancient Dissolved Organic Carbon in Arctic Ocean Sediment: A Pathway of Carbon Cycling in the Extreme Environment

Sources, Sinks, and Subsidies: Terrestrial Carbon Storage in Mid‐latitude Fjords

Trophic characteristics of zooplankton and zoobenthos in certain water masses in the western Chukchi Sea, by δ<sup>15</sup>N and δ<sup>13</sup>С data

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