Methane production and oxidation in Santa Barbara Basin sediments

Kosiur, David R.; Warford, Ann L.

doi:10.1016/0302-3524(79)90054-9

Cited by 61 publications

(30 citation statements)

References 17 publications

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“…It is likely that the maximum concentration we report here is not the actual maximum for the site, as methane maxima usually occur close to the base of the sulfate reduction zone (approximately 2 mbsf, see below), a depth interval for which we have no methane data. Maximum methane concentrations of 9500, 12,300, and 10,700 µmol/L have been recorded at 2.7, 3.8, and 5.7 mbsf, respectively, in SBB sediments (Barnes and Goldberg, 1976;Warford et al, 1979;Kosiur and Warford, 1979;Doose and Kaplan 1981). These were related to pore water concentrations of sulfate, which decreased from 27.6 mmol/L at the surface to 0 between 1.5-2 mbsf Doose and Kaplan, 1981), concomitant with an increase in reduced sulfur species Schimmelmann and Kastner, 1993).…”

Section: Resultsmentioning

confidence: 95%

Bacterial Profiles in Deep Sediments of the Santa Barbara Basin, Site 893

Cragg¹,

Parkes²,

Fry³

et al. 1995

Proceedings of the Ocean Drilling Program

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Bacterial depth profiles were obtained from high-organic-load sediments (water depth 538 m) to a depth of 68.28 m below seafloor. Using the Acridine Orange Direct Count (AODC) technique, near-surface bacterial populations were 1.27 × 10 9 cells/ cm 3 . Numbers of bacteria decreased rapidly to 4.77 × 10 6 cells/cm 3 at 12 mbsf and then more slowly to 2.51 × 10 6 cells/cm 3 at 68.28 mbsf (505-fold decrease). Dividing cells represented approximately 10% of the total count but decreased at a greater rate (850-fold). There was an abrupt change in the rate of total bacterial population decrease at approximately 13 mbsf. Bacterial numbers were strongly correlated (P « 0.002) with total organic carbon. Near-surface concentrations of organic carbon rapidly decreased from approximately 3.6% to 2.0% at 13 mbsf, and thereafter remained at 1.5%-2.0% to the base of the core at 68.28 mbsf, indicating a high level of recalcitrance. The changes in the rate of bacterial population decrease with depth may be a response to increasingly recalcitrant organic carbon. High levels of methane (4100 µmol/L) were found at 9.0 mbsf, although the maximum concentration present in the sediment at this site may be in an unsampled horizon above this depth. At greater depth, methane concentrations were still high (>IOOO µmol/L), and although this area has many seeps of oil and gas, the C|/C 2+ ratios indicate a biogenic rather than a fhermogenic source.This work represents the first detailed microbiological analysis of deep sediment layers from the Santa Barbara Basin.

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Section: Resultsmentioning

confidence: 95%

Bacterial Profiles in Deep Sediments of the Santa Barbara Basin, Site 893

Cragg¹,

Parkes²,

Fry³

et al. 1995

Proceedings of the Ocean Drilling Program

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“…Biological experiments with deep oceanic sediments have been confined to the upper few meters of the sedimentary column, because samples were recovered by gravity corers. Kosiur and Warford (1979) found methanogenic activity in sediment from the upper 3.3 meters of the Santa Barbara Basin, and Belyaev and Laurinavichus (1977) reported activity in the surface sediment in the Gulf of California (Fig. 1).…”

Section: Introductionmentioning

confidence: 92%

Methanogenic Activity in Sediment from Leg 64, Gulf of California

Oremland¹,

Culbertson²,

Simoneit³

1982

Initial Reports of the Deep Sea Drilling Project

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We detected methanogenic bacterial activity in 6 of 12 sediment samples from Deep Sea Drilling Project (DSDP) locations in the Gulf of California.When samples were incubated anaerobically for three weeks at temperatures of 10 or 22°C, we found activity to sediment depths of about 12 meters. The methanogenic bacteria were inhibited by CHC1 3 or 2-bromoethanesulfonic acid and were generally stimulated by H 2 .

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“…Kosiur and Warford (1979) concluded from changes in specific activity of 14CH4 and 14C0, produced from [ 14C]acetate and [ 14C]lactate that anaerobic methane oxidation occurs in marine sediments. In situ rates of methane oxidation in marine sediments have been measured by the use of [14C]methane (Reeburgh 1980;Iversen and Blackburn 198 1;Devol 1983).…”

mentioning

confidence: 99%

Anaerobic methane oxidation rates at the sulfate‐methane transition in marine sediments from Kattegat and Skagerrak (Denmark)1

Iversen

Jørgensen

1985

Limnology & Oceanography

511

274

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Concomitant radiotracer measurements were made of in situ rates of sulfate reduction and anaerobic methane oxidation in 2-3-m-long sediment cores. Methane accumulated to high concentrations (> 1 mM CH,) only below the sulfate zone, at 1 m or deeper in the sediment. Sulfate reduction showed a broad maximum below the sediment surface and a smaller, narrow maximum at the sulfate-methane transition. Methane oxidation was low (0.002-0.1 nmol CH, cm-3 d-l) throughout the sulfate zone and showed a sharp maximum at the sulfate-methane transition, coinciding with the sulfate reduction maximum. Total anaerobic methane oxidation at two stations was 0.83 and 1.16 mmol CH4 m-2 d-* , ofwhich 96% was confined to the sulfate-methane transition. All the methane that was calculated to diffuse up into the sulfate-methane transition was oxidized in this zone. The methane oxidation was equivalent to 10% of the electron donor requirement for the total measured sulfate reduction. A third station showed high sulfate concentrations at all depths sampled and the total methane oxidation was only 0.0 13 mmol m-2 d-l.From direct measurements of rates, concentration gradients, and diffusion coefficients, simple calculations were made of sulfate and methane fluxes and of methane production rates.

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Methane production and oxidation in Santa Barbara Basin sediments

Cited by 61 publications

References 17 publications

Bacterial Profiles in Deep Sediments of the Santa Barbara Basin, Site 893

Bacterial Profiles in Deep Sediments of the Santa Barbara Basin, Site 893

Methanogenic Activity in Sediment from Leg 64, Gulf of California

Anaerobic methane oxidation rates at the sulfate‐methane transition in marine sediments from Kattegat and Skagerrak (Denmark)1

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