Kinetics of organic carbon mineralization and methane formation in marine sediments (Aarhus Bay, Denmark)

Dale, Andrew W.; Flury, Sabine; Fossing, Henrik; Regnier, Pierre; Røy, Hans; Scholze, Caroline; Jørgensen, Bo Barker

doi:10.1016/j.gca.2019.02.033

Cited by 28 publications

(22 citation statements)

References 90 publications

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“…Finally, despite recent progress, it is still unknown what causes the discrepancy between measured and modeled SRR. Sulfate reduction in marine sediments is strongly focused, (a) toward the ocean margins with high depositional rates (Egger et al, 2018), and (b) toward the surface zone with complex bioirrigation, sediment reworking and sulfide reoxidation (Dale et al, 2019). This complexity causes a general discrepancy between modeled net rates and 35 S-measured gross rates of sulfate reduction, both on a local and a global scale (e.g., Canfield et al, 2005; Jørgensen and Parkes, 2010; Bowles et al, 2014).…”

Section: Synthesis and Future Directionsmentioning

confidence: 99%

“…This complexity causes a general discrepancy between modeled net rates and 35 S-measured gross rates of sulfate reduction, both on a local and a global scale (e.g., Canfield et al, 2005; Jørgensen and Parkes, 2010; Bowles et al, 2014). Further research on sediment reworking and irrigation by benthic fauna and on sulfide recycling is needed to reconcile SRR determined by the two approaches (Dale et al, 2019). Furthermore, enzymatic back-reaction during microbial sulfate reduction could lead to an overestimation of rates determined by the 35 S technique.…”

Section: Synthesis and Future Directionsmentioning

confidence: 99%

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The Biogeochemical Sulfur Cycle of Marine Sediments

2019

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Microbial dissimilatory sulfate reduction to sulfide is a predominant terminal pathway of organic matter mineralization in the anoxic seabed. Chemical or microbial oxidation of the produced sulfide establishes a complex network of pathways in the sulfur cycle, leading to intermediate sulfur species and partly back to sulfate. The intermediates include elemental sulfur, polysulfides, thiosulfate, and sulfite, which are all substrates for further microbial oxidation, reduction or disproportionation. New microbiological discoveries, such as long-distance electron transfer through sulfide oxidizing cable bacteria, add to the complexity. Isotope exchange reactions play an important role for the stable isotope geochemistry and for the experimental study of sulfur transformations using radiotracers. Microbially catalyzed processes are partly reversible whereby the back-reaction affects our interpretation of radiotracer experiments and provides a mechanism for isotope fractionation. We here review the progress and current status in our understanding of the sulfur cycle in the seabed with respect to its microbial ecology, biogeochemistry, and isotope geochemistry.

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Section: Synthesis and Future Directionsmentioning

confidence: 99%

Section: Synthesis and Future Directionsmentioning

confidence: 99%

The Biogeochemical Sulfur Cycle of Marine Sediments

2019

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“…Further details about the measurements and calculations of the dissolved CH 4 concentration can be found in Bange et al (2010). The mean precision of the CH 4 measurements, calculated as the median of the estimated standard errors (see David, 1951) from all triplicate measurements, was ±1.3 nM. Samples with an estimated standard error of >10 % were omitted.…”

Section: Sample Collection and Measurementmentioning

confidence: 99%

A decade of methane measurements at the Boknis Eck Time Series Station in Eckernförde Bay (southwestern Baltic Sea)

Sun

Lennartz

et al. 2020

Biogeosciences

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Abstract. Coastal areas contribute significantly to the emissions of methane (CH4) from the ocean. In order to decipher its temporal variability in the whole water column, dissolved CH4 was measured on a monthly basis at the Boknis Eck Time Series Station (BE) located in Eckernförde Bay (SW Baltic Sea) from 2006 to 2017. BE has a water depth of about 28 m, and dissolved CH4 was measured at six water depths ranging from 0 to 25 m. In general, CH4 concentrations increased with depth, indicating a sedimentary release of CH4. Pronounced enhancement of the CH4 concentrations in the bottom layer (15–25 m) was found during February, May–June and October. CH4 was not correlated with Chlorophyll a or O2 over the measurement period. Unusually high CH4 concentrations (of up to 696 nM) were sporadically observed in the upper layer (0–10 m; e.g., in November 2013 and December 2014) and coincided with major Baltic inflow (MBI) events. Surface CH4 concentrations were always supersaturated throughout the monitoring period, indicating that Eckernförde Bay is an intense but highly variable source of atmospheric CH4. We did not detect significant temporal trends in CH4 concentrations or emissions, despite ongoing environmental changes such as warming and deoxygenation in Eckernförde Bay. Overall, the CH4 variability at BE is driven by a complex interplay of various biological and physical processes.

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“…Bange et al, 1994;Upstill-Goddard et al, 2000;Borges et al, 2016). Dissolved CH 4 in coastal waters is mainly resulting from the interplay of (i) sedimentary sources such as anaerobic methanogenesis during the decomposition of organic matter (Xiao et al, 2018;Dale et al, 2019) or seepage from oi land natural gas reservoirs (Bernard et al, 1976;Hovland et al, 1993;Judd et al, 2002) and (ii) microbial CH 4 consumption which occurs under oxic conditions in the water column and under anoxic conditions in the sediments (Pimenov et al, 2013;Steinle et al, 2017;Egger et al, 2018). Only recently, Weber et al (2019) estimated the global https://doi.org/10.5194/bg-2020-107 Preprint.…”

Section: Introductionmentioning

confidence: 99%

A decade of methane measurements at the Boknis Eck Time-series Station in the Eckernförde Bay (Southwestern Baltic Sea)

Ma¹,

Sun²,

Lennartz³

et al. 2020

Preprint

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Abstract. Coastal areas contribute significantly to the emissions of methane (CH4) from the ocean. In order to decipher its temporal variability in the whole water column, dissolved CH4 was measured on a monthly basis at the Boknis Eck Time-series Station (BE) located in the Eckernförde Bay (SW Baltic Sea) from 2006 to 2017. BE has a water depth of about 28 m and dissolved CH4 was measured at six water depths ranging from 0 to 25 m. In general CH4 concentrations increased with depth, indicating a sedimentary release of CH4. Pronounced enhancement of the CH4 concentrations in the bottom layer (15–25 m) was found during February, May–June and October. CH4 was not correlated with Chlorophyll a or O2 over the measurement period. Unusually high CH4 concentrations (of up to 696 nM) were sporadically observed in the upper layer (0–10 m) (e.g. in November 2013 and December 2014) and were coinciding with Major Baltic Inflow (MBI) events. Surface CH4 concentrations were always supersaturated throughout the monitoring period, indicating that the Eckernförde Bay is an intense but highly variable source of atmospheric CH4. We did not detect significant temporal trends in CH4 concentrations or emissions, despite of ongoing environmental changes such as warming and deoxygenation in the Eckernförde Bay. Overall, the CH4 variability at BE is driven by a complex interplay of various biological and physical processes.

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Kinetics of organic carbon mineralization and methane formation in marine sediments (Aarhus Bay, Denmark)

Cited by 28 publications

References 90 publications

The Biogeochemical Sulfur Cycle of Marine Sediments

The Biogeochemical Sulfur Cycle of Marine Sediments

A decade of methane measurements at the Boknis Eck Time Series Station in Eckernförde Bay (southwestern Baltic Sea)

A decade of methane measurements at the Boknis Eck Time-series Station in the Eckernförde Bay (Southwestern Baltic Sea)

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