Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment

Volker Brüchert, Lisa Bröder, Joanna E. Sawicka, Tommaso Tesi, Samantha P. Joye, Xiaole Sun, Igor P. Semiletov, Vladimir A. Samarkin

Результат исследований: Материалы для журналаСтатья

1 цитирование (Scopus)

Выдержка

The Siberian Arctic Sea shelf and slope is a key region for the degradation of terrestrial organic material transported from the organic-carbon-rich permafrost regions of Siberia. We report on sediment carbon mineralization rates based on O2 microelectrode profiling; intact sediment core incubations; 35S-sulfate tracer experiments; pore-water dissolved inorganic carbon (DIC); 13CDIC; and iron, manganese, and ammonium concentrations from 20 shelf and slope stations. This data set provides a spatial overview of sediment carbon mineralization rates and pathways over large parts of the outer Laptev and East Siberian Arctic shelf and slope and allows us to assess degradation rates and efficiency of carbon burial in these sediments. Rates of oxygen uptake and iron and manganese reduction were comparable to temperate shelf and slope environments, but bacterial sulfate reduction rates were comparatively low. In the topmost 50cm of sediment, aerobic carbon mineralization dominated degradation and comprised on average 84% of the depth-integrated carbon mineralization. Oxygen uptake rates and anaerobic carbon mineralization rates were higher in the eastern East Siberian Sea shelf compared to the Laptev Sea shelf. DIC•NH4+ ratios in pore waters and the stable carbon isotope composition of remineralized DIC indicated that the degraded organic matter on the Siberian shelf and slope was a mixture of marine and terrestrial organic matter. Based on dual end-member calculations, the terrestrial organic carbon contribution varied between 32 and 36%, with a higher contribution in the Laptev Sea than in the East Siberian Sea. Extrapolation of the measured degradation rates using isotope end-member apportionment over the outer shelf of the Laptev and East Siberian seas suggests that about 16TgCyr'1 is respired in the outer shelf seafloor sediment. Of the organic matter buried below the oxygen penetration depth, between 0.6 and 1.3TgCyr'1 is degraded by anaerobic processes, with a terrestrial organic carbon contribution ranging between 0.3 and 0.5Tgyr'1.

Язык оригиналаАнглийский
Страницы (с-по)471-490
Число страниц20
ЖурналBiogeosciences
Том15
Номер выпуска2
DOI
СостояниеОпубликовано - 1 янв 2018

Отпечаток

shelf sea
mineralization
sediments
carbon
sediment
degradation
organic carbon
dissolved inorganic carbon
organic matter
oxygen
manganese
porewater
sulfate
oxic sediment
iron
rate
Arctic region
isotopes
sulfates
permafrost

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Earth-Surface Processes

Цитировать

Brüchert, V., Bröder, L., Sawicka, J. E., Tesi, T., Joye, S. P., Sun, X., ... Samarkin, V. A. (2018). Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment. Biogeosciences, 15(2), 471-490. https://doi.org/10.5194/bg-15-471-2018

Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment. / Brüchert, Volker; Bröder, Lisa; Sawicka, Joanna E.; Tesi, Tommaso; Joye, Samantha P.; Sun, Xiaole; Semiletov, Igor P.; Samarkin, Vladimir A.

В: Biogeosciences, Том 15, № 2, 01.01.2018, стр. 471-490.

Результат исследований: Материалы для журналаСтатья

Brüchert, V, Bröder, L, Sawicka, JE, Tesi, T, Joye, SP, Sun, X, Semiletov, IP & Samarkin, VA 2018, 'Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment', Biogeosciences, том. 15, № 2, стр. 471-490. https://doi.org/10.5194/bg-15-471-2018
Brüchert V, Bröder L, Sawicka JE, Tesi T, Joye SP, Sun X и соавт. Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment. Biogeosciences. 2018 Янв. 1;15(2):471-490. https://doi.org/10.5194/bg-15-471-2018
Brüchert, Volker ; Bröder, Lisa ; Sawicka, Joanna E. ; Tesi, Tommaso ; Joye, Samantha P. ; Sun, Xiaole ; Semiletov, Igor P. ; Samarkin, Vladimir A. / Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment. В: Biogeosciences. 2018 ; Том 15, № 2. стр. 471-490.
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abstract = "The Siberian Arctic Sea shelf and slope is a key region for the degradation of terrestrial organic material transported from the organic-carbon-rich permafrost regions of Siberia. We report on sediment carbon mineralization rates based on O2 microelectrode profiling; intact sediment core incubations; 35S-sulfate tracer experiments; pore-water dissolved inorganic carbon (DIC); 13CDIC; and iron, manganese, and ammonium concentrations from 20 shelf and slope stations. This data set provides a spatial overview of sediment carbon mineralization rates and pathways over large parts of the outer Laptev and East Siberian Arctic shelf and slope and allows us to assess degradation rates and efficiency of carbon burial in these sediments. Rates of oxygen uptake and iron and manganese reduction were comparable to temperate shelf and slope environments, but bacterial sulfate reduction rates were comparatively low. In the topmost 50cm of sediment, aerobic carbon mineralization dominated degradation and comprised on average 84{\%} of the depth-integrated carbon mineralization. Oxygen uptake rates and anaerobic carbon mineralization rates were higher in the eastern East Siberian Sea shelf compared to the Laptev Sea shelf. DIC•NH4+ ratios in pore waters and the stable carbon isotope composition of remineralized DIC indicated that the degraded organic matter on the Siberian shelf and slope was a mixture of marine and terrestrial organic matter. Based on dual end-member calculations, the terrestrial organic carbon contribution varied between 32 and 36{\%}, with a higher contribution in the Laptev Sea than in the East Siberian Sea. Extrapolation of the measured degradation rates using isotope end-member apportionment over the outer shelf of the Laptev and East Siberian seas suggests that about 16TgCyr'1 is respired in the outer shelf seafloor sediment. Of the organic matter buried below the oxygen penetration depth, between 0.6 and 1.3TgCyr'1 is degraded by anaerobic processes, with a terrestrial organic carbon contribution ranging between 0.3 and 0.5Tgyr'1.",
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