Microbial Mn(IV) and Fe(III) reduction in northern Barents Sea sediments under different conditions of ice cover and organic carbon deposition

Maren Nickel, Verona Vandieken, Volker Brüchert, Bo Barker Jørgensen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Udgivelsesdato: Oct. 2008
OriginalsprogEngelsk
TidsskriftDeep Sea Research - Part II - Topical Studies in Oceanography
Vol/bind55
Udgave nummer20-21
Sider (fra-til)2390-2398
Antal sider9
ISSN0967-0645
DOI
StatusUdgivet - 1. okt. 2008
Udgivet eksterntJa

Fingeraftryk

ice cover
organic carbon
sedimentation rate
sulfate
sediment
oxidation
carbon
fjord
oxygen consumption
open ocean
primary production
seafloor
sea
oxide
ice
electron
rate
station

Citer dette

@article{0ac94ae02f6511deb0ce000ea68e967b,
title = "Microbial Mn(IV) and Fe(III) reduction in northern Barents Sea sediments under different conditions of ice cover and organic carbon deposition",
abstract = "Carbon oxidation rates and pathways were determined in two sediments at latitude 75° and 77°N southeast of Svalbard in the northern Barents Sea. Seasonal ice cover restricts primary production to few months a year, which determines the sedimentation rate of organic material to the seafloor. At one station, with seasonally extended ice cover, low organic carbon content and sedimentation rate combined with relatively high concentrations of Mn and Fe(III) oxides favored dissimilatory Fe and Mn reduction (98{\%} of anaerobic carbon oxidation) over sulfate reduction in the top 12 cm of the sediment. In contrast, in a sediment that had not been ice covered for at least 12 months and with more organic carbon and a higher sedimentation rate, sulfate reduction was the most important anaerobic electron-accepting process (>80{\%} of anaerobic carbon oxidation). In the upper 3 cm, microbial Fe and sulfate reduction occurred simultaneously, and sulfate reduction dominated at 3–12 cm. Oxygen consumption rates (1.9 and 3.7 mmol m−2 d−1) and anaerobic CO2 production rates (1.3 and 6.4 mmol m−2 d−1) of both stations were similar to rates from open-ocean sediments farther north in the Barents Sea but lower compared to those in fjords of Svalbard.",
author = "Maren Nickel and Verona Vandieken and Volker Br{\"u}chert and J{\o}rgensen, {Bo Barker}",
year = "2008",
month = "10",
day = "1",
doi = "10.1016/j.dsr2.2008.05.003",
language = "English",
volume = "55",
pages = "2390--2398",
journal = "Deep-Sea Research. Part 2: Topical Studies in Oceanography",
issn = "0967-0645",
publisher = "Pergamon Press",
number = "20-21",

}

Microbial Mn(IV) and Fe(III) reduction in northern Barents Sea sediments under different conditions of ice cover and organic carbon deposition. / Nickel, Maren; Vandieken, Verona; Brüchert, Volker; Jørgensen, Bo Barker.

I: Deep Sea Research - Part II - Topical Studies in Oceanography, Bind 55, Nr. 20-21, 01.10.2008, s. 2390-2398.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Microbial Mn(IV) and Fe(III) reduction in northern Barents Sea sediments under different conditions of ice cover and organic carbon deposition

AU - Nickel, Maren

AU - Vandieken, Verona

AU - Brüchert, Volker

AU - Jørgensen, Bo Barker

PY - 2008/10/1

Y1 - 2008/10/1

N2 - Carbon oxidation rates and pathways were determined in two sediments at latitude 75° and 77°N southeast of Svalbard in the northern Barents Sea. Seasonal ice cover restricts primary production to few months a year, which determines the sedimentation rate of organic material to the seafloor. At one station, with seasonally extended ice cover, low organic carbon content and sedimentation rate combined with relatively high concentrations of Mn and Fe(III) oxides favored dissimilatory Fe and Mn reduction (98% of anaerobic carbon oxidation) over sulfate reduction in the top 12 cm of the sediment. In contrast, in a sediment that had not been ice covered for at least 12 months and with more organic carbon and a higher sedimentation rate, sulfate reduction was the most important anaerobic electron-accepting process (>80% of anaerobic carbon oxidation). In the upper 3 cm, microbial Fe and sulfate reduction occurred simultaneously, and sulfate reduction dominated at 3–12 cm. Oxygen consumption rates (1.9 and 3.7 mmol m−2 d−1) and anaerobic CO2 production rates (1.3 and 6.4 mmol m−2 d−1) of both stations were similar to rates from open-ocean sediments farther north in the Barents Sea but lower compared to those in fjords of Svalbard.

AB - Carbon oxidation rates and pathways were determined in two sediments at latitude 75° and 77°N southeast of Svalbard in the northern Barents Sea. Seasonal ice cover restricts primary production to few months a year, which determines the sedimentation rate of organic material to the seafloor. At one station, with seasonally extended ice cover, low organic carbon content and sedimentation rate combined with relatively high concentrations of Mn and Fe(III) oxides favored dissimilatory Fe and Mn reduction (98% of anaerobic carbon oxidation) over sulfate reduction in the top 12 cm of the sediment. In contrast, in a sediment that had not been ice covered for at least 12 months and with more organic carbon and a higher sedimentation rate, sulfate reduction was the most important anaerobic electron-accepting process (>80% of anaerobic carbon oxidation). In the upper 3 cm, microbial Fe and sulfate reduction occurred simultaneously, and sulfate reduction dominated at 3–12 cm. Oxygen consumption rates (1.9 and 3.7 mmol m−2 d−1) and anaerobic CO2 production rates (1.3 and 6.4 mmol m−2 d−1) of both stations were similar to rates from open-ocean sediments farther north in the Barents Sea but lower compared to those in fjords of Svalbard.

U2 - 10.1016/j.dsr2.2008.05.003

DO - 10.1016/j.dsr2.2008.05.003

M3 - Journal article

VL - 55

SP - 2390

EP - 2398

JO - Deep-Sea Research. Part 2: Topical Studies in Oceanography

JF - Deep-Sea Research. Part 2: Topical Studies in Oceanography

SN - 0967-0645

IS - 20-21

ER -