Anaerobic methane oxidation: Rate depth distributions in Skan Bay sediments

Reeburgh, William S.

doi:10.1016/0012-821x(80)90021-7

Cited by 286 publications

(149 citation statements)

References 27 publications

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“…Sediment distributions were measured in two cores, one from the shelf (BS5-1) and one from the deep basin (BSK-2). A concave-up methane distribution in the shelf core showed that anaerobic methane oxidation (Reeburgh, 1980) was occurring, and a small methane concentration gradient in the portion of the core above the anaerobic methane oxidation zone permitted calculation of a methane flux of 0.2 mol m À2 yr À1 . Methane concentrations lower than adjacent overlying water concentrations observed in the deep basin core, as well as methane oxidation rate measurements using 14 C-CH 4 showed that the deep sediments must be consuming methane from the adjacent overlying waters.…”

Section: Methane Budgetmentioning

confidence: 99%

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Reeburgh

Tyler

Carroll

2006

Deep Sea Research Part II: Topical Studies in Oceanography

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We report measurements of d 13 C-CH 4 and d 2 H-CH 4 at a central station in the Black Sea. We considered the Black Sea as a ''biogeochemical bucket'' and the single station as a basin-wide integrator of processes affecting methane. Considering the rapid (3.6-18 yr) turnover of methane and the similarity of these stable isotope distributions to the methane concentration and oxidation rate profiles [Reeburgh, Ward, Whalen, Sandbeck, Kilpatrick, Kerkhof, 1991. Black Sea methane geochemistry. Deep-Sea Research 38, S1189-S1210], it appears that methane is being added approximately as fast as it is being oxidized. Methane can be thought of as ''running in place'' in the Black Sea water column.Recent reports of extensive vents on the northern side of the Black Sea suggest that they might be a methane source capable of effectively balancing the Black Sea methane budget. Unfortunately, we have limited information on basin-wide seep fluxes and cannot identify them with stable isotope measurements. Methane oxidation (and accompanying isotope fractionation) is so extensive that the water-column stable isotope measurements provide little information on methane sources. Future measurements of 14 C-CH 4 should permit partitioning Black Sea methane sources into fossil and recent components. r

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Section: Methane Budgetmentioning

confidence: 99%

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Reeburgh

Tyler

Carroll

2006

Deep Sea Research Part II: Topical Studies in Oceanography

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“…2), zooplankton guts and fecal pellet microenvironments likely provide ≤ 1% of the total source of CH 4 to the water column. At the shelf station, the CH 4 concentration measured in a sediment core displayed a concave up distribution which shows that AOM is occurring [43]. A small positive CH 4 concentration gradient between the surface sediments and the water column indicates that sediments on the shelf are a source of CH 4 to the water column.…”

Section: Introductionmentioning

confidence: 95%

Basin-wide estimates of the input of methane from seeps and clathrates to the Black Sea

Kessler

Reeburgh

Southon

et al. 2006

Earth and Planetary Science Letters

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Numerous methane-emitting bottom features, such as seeps, methane clathrate hydrates (clathrates), and mud volcanoes, have been identified recently in the Black Sea. The fluxes of methane from these sources averaged over large spatial scales are unknown. Here we take advantage of the fact that the Black Sea is a semi-enclosed basin with restricted deep water circulation to establish firstorder estimates of basin-wide fluxes of methane from these sources to the water column and atmosphere. First, we measured the natural radiocarbon content of methane ( 14 C-CH 4 ) dissolved in the water column and emitted from seeps. The 14 C-CH 4 results showed that the dominant source of methane to the water column is emitted from seeps and a smaller source is diagenetically produced in relatively modern sediments. The 14 C-CH 4 results were then used to partition a basin-wide total methane budget; this analysis estimated the basin-wide flux of methane from seeps and clathrates to the water column to be 3.60 to 4.28 Tg yr − 1 . Second, a geochemical box model was used to calculate possible distributions of methane inputs from seeps and clathrates as well as provide additional estimates of the basin-wide flux of methane from seeps and clathrates to the water column (4.95 to 5.65 Tg yr − 1 ).

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“…In marine sediments, anaerobic methane oxidation is the dominant pathway for methane consumption (Blair and Aller, 1995;Borowski et al, 1996;Burns, 1998;Iverson and Jørgensen, 1985;Reeburgh, 1980), and consequently, the flux of methane to the atmosphere from marine sediments is small compared to other sources (Reeburgh, 1996). However, it is unclear whether this has always been true or if this process can be disrupted by future climate change, and thus, it is important to understand the mechanism of anaerobic methane oxidation.…”

Section: Introductionmentioning

confidence: 99%

Archaeal lipids in Mediterranean cold seeps: molecular proxies for anaerobic methane oxidation

Pancost

Hopmans

Damsté

2001

Geochimica et Cosmochimica Acta

267

175

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Abstract-We investigated the distributions and ␦ 13 C values of biomarkers for Archaea associated with anaerobic methane oxidation in disparate settings throughout two Eastern Mediterranean mud dome fields. All major classes of archaeal lipids are present in the studied sediments, including isoprenoid glycerol diethers, isoprenoid glycerol dialkyl glycerol tetraethers, and irregular isoprenoid hydrocarbons. Of the compounds present, many, including a novel glycerol tetraether and sn-3-hydroxyarchaeol, have not been previously reported for settings in which methane oxidation is presumed to occur. Archaeal lipids are depleted in 13 C, indicating that the Archaea from which they derive are either directly or indirectly involved with methane consumption. The most widespread archaeal lipids are archaeol, PMI, and glycerol tetraethers, and these compounds are present at all active sites. However, archaeal lipid abundances and distributions are highly variable; ratios of crocetane, PMI, and hydroxyarchaeol relative to archaeol vary from 0 to 6.5, from 0 to 2, and from 0 to 1, respectively. These results suggest that archaeal communities differ amongst the sites examined. In addition, carbon isotopic variability amongst archaeal biomarkers in a given mud breccia can be as large as 24 ‰, suggesting that even at single sites multiple archaeal species perform or are supported by anaerobic methane oxidation.

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Anaerobic methane oxidation: Rate depth distributions in Skan Bay sediments

Cited by 286 publications

References 27 publications

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Stable carbon and hydrogen isotope measurements on Black Sea water-column methane

Basin-wide estimates of the input of methane from seeps and clathrates to the Black Sea

Archaeal lipids in Mediterranean cold seeps: molecular proxies for anaerobic methane oxidation

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