scholarly journals Anaerobic oxidation of methane: an underappreciated aspect of methane cycling in peatland ecosystems?

2010 ◽  
Vol 7 (5) ◽  
pp. 7945-7983 ◽  
Author(s):  
K. A. Smemo ◽  
J. B. Yavitt
Keyword(s):  
Large Body ◽  
Conclusive Evidence ◽  
Future Research ◽  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
Ch4 Oxidation ◽  
Oxidation Of Methane ◽  
Ch4 Production

Abstract. Despite a large body of literature on microbial anaerobic oxidation of methane (AOM) in marine sediments and saline waters and its importance to the global methane (CH4) cycle, until recently little work has addressed the potential occurrence and importance of AOM in non-marine systems. This is particularly true for peatlands, which represent both a massive sink for atmospheric CO2 and a significant source of atmospheric CH4. Our knowledge of this process in peatlands is inherently limited by the methods used to study CH4 dynamics in soil and sediment and the assumption that there are no anaerobic sinks for CH4 in these systems. Studies suggest that AOM is CH4-limited and difficult to detect in potential CH4 production assays against a background of CH4 production. In situ rates also might be elusive due to background rates of aerobic CH4 oxidation and the difficulty in separating net and gross process rates. Conclusive evidence for the electron acceptor in this process has not been presented. Nitrate and sulfate are both plausible and favorable electron acceptors, as seen in other systems, but there exist theoretical issues related to the availability of these ions in peatlands and only circumstantial evidence suggests that these pathways are important. Iron cycling is important in many wetland systems, but recent evidence does not support the notion of CH4 oxidation via dissimilatory Fe(III) reduction or a CH4 oxidizing archaea in consortium with an Fe(III) reducer. Calculations based on published rates demonstrate that AOM might be a significant and underappreciated constraint on the global CH4 cycle, although much about the process in unknown, in vitro rates may not relate well to in situ rates, and projections based on those rates are fraught with uncertainty. We suggest electron transfer mechanisms, C flow and pathways, and quantifying in situ peatland AOM rates as the highest priority topics for future research.

scholarly journals Anaerobic oxidation of methane: an underappreciated aspect of methane cycling in peatland ecosystems?

2011 ◽  
Vol 8 (3) ◽  
pp. 779-793 ◽  
Author(s):  
K. A. Smemo ◽  
J. B. Yavitt
Keyword(s):  
Large Body ◽  
Conclusive Evidence ◽  
Future Research ◽  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
Ch4 Oxidation ◽  
Oxidation Of Methane ◽  
Ch4 Production

Abstract. Despite a large body of literature on microbial anaerobic oxidation of methane (AOM) in marine sediments and saline waters and its importance to the global methane (CH4) cycle, until recently little work has addressed the potential occurrence and importance of AOM in non-marine systems. This is particularly true for peatlands, which represent both a massive sink for atmospheric CO2 and a significant source of atmospheric CH4. Our knowledge of this process in peatlands is inherently limited by the methods used to study CH4 dynamics in soil and sediment and the assumption that there are no anaerobic sinks for CH4 in these systems. Studies suggest that AOM is CH4-limited and difficult to detect in potential CH4 production assays against a background of CH4 production. In situ rates also might be elusive due to background rates of aerobic CH4 oxidation and the difficulty in separating net and gross process rates. Conclusive evidence for the electron acceptor in this process has not been presented. Nitrate and sulfate are both plausible and favorable electron acceptors, as seen in other systems, but there exist theoretical issues related to the availability of these ions in peatlands and only circumstantial evidence suggests that these pathways are important. Iron cycling is important in many wetland systems, but recent evidence does not support the notion of CH4 oxidation via dissimilatory Fe(III) reduction or a CH4 oxidizing archaea in consortium with an Fe(III) reducer. Calculations based on published rates demonstrate that AOM might be a significant and underappreciated constraint on the global CH4 cycle, although much about the process is unknown, in vitro rates may not relate well to in situ rates, and projections based on those rates are fraught with uncertainty. We suggest electron transfer mechanisms, C flow and pathways, and quantifying in situ peatland AOM rates as the highest priority topics for future research.

scholarly journals Anaerobic Methane Oxidation in High-Arctic Alaskan Peatlands as a Significant Control on Net CH4 Fluxes

Soil Systems ◽  
2019 ◽  
Vol 3 (1) ◽  
pp. 7 ◽  
Author(s):  
Kimberley Miller ◽  
Chun-Ta Lai ◽  
Randy Dahlgren ◽  
David Lipson
Keyword(s):  
Global Climate ◽  
Average Rate ◽  
High Arctic ◽  
Reaction Rate Constant ◽  
Anaerobic Oxidation Of Methane ◽  
Ambient Conditions ◽  
Oxidation Of Methane ◽  
Ch4 Production ◽  
Shallow Soils

Terrestrial consumption of the potent greenhouse gas methane (CH4) is a critical aspect of the future climate, as CH4 concentrations in the atmosphere are projected to play an increasingly important role in global climate forcing. Anaerobic oxidation of methane (AOM) has only recently been considered a relevant control on methane fluxes from terrestrial systems. We performed in vitro anoxic incubations of intact peat from Utqiaġvik (Barrow), Alaska using stable isotope tracers. Our results showed an average potential AOM rate of 15.0 nmol cm3 h−1, surpassing the average rate of gross CH4 production (6.0 nmol cm3 h−1). AOM and CH4 production rates were positively correlated. While CH4 production was insensitive to additions of Fe(III), there was a depth:Fe(III) interaction in the kinetic reaction rate constant for AOM, suggestive of stimulation by Fe(III), particularly in shallow soils (<10 cm). We estimate AOM would consume 25–34% of CH4 produced under ambient conditions. Soil genetic surveys showed phylogenetic links between soil microbes and known anaerobic methanotrophs in ANME groups 2 and 3. These results suggest a prevalent role of AOM to net CH4 fluxes from Arctic peatland ecosystems, and a probable link with Fe(III)-reduction.

In Situ X-ray Photoelectron Spectroscopy Detects Multiple Active Sites Involved in the Selective Anaerobic Oxidation of Methane in Copper-Exchanged Zeolites

ACS Catalysis ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 6728-6737 ◽  
Author(s):  
Luca Artiglia ◽  
Vitaly L. Sushkevich ◽  
Dennis Palagin ◽  
Amy J. Knorpp ◽  
Kanak Roy ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
X Ray ◽  
Oxidation Of Methane

In vitro cell growth of marine archaeal-bacterial consortia during anaerobic oxidation of methane with sulfate

2007 ◽  
Vol 9 (1) ◽  
pp. 187-196 ◽  
Author(s):  
Katja Nauhaus ◽  
Melanie Albrecht ◽  
Marcus Elvert ◽  
Antje Boetius ◽  
Friedrich Widdel
Keyword(s):  
Cell Growth ◽  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
Bacterial Consortia ◽  
Oxidation Of Methane

Simultaneous nitrate and sulfate dependent anaerobic oxidation of methane linking carbon, nitrogen and sulfur cycles

2021 ◽  
Vol 194 ◽  
pp. 116928
Author(s):  
Wen-Bo Nie ◽  
Jie Ding ◽  
Guo-Jun Xie ◽  
Xin Tan ◽  
Yang Lu ◽  
...  
Keyword(s):  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
Oxidation Of Methane

scholarly journals Can anaerobic oxidation of methane prevent seafloor gas escape in a warming climate?

Solid Earth ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 1541-1554 ◽  
Author(s):  
Christian Stranne ◽  
Matt O'Regan ◽  
Martin Jakobsson ◽  
Volker Brüchert ◽  
Marcelo Ketzer
Keyword(s):  
Climate Warming ◽  
Future Climate ◽  
Hydraulic Fractures ◽  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
Warming Scenario ◽  
Oxidation Of Methane ◽  
Warming Climate ◽  
Continental Slopes ◽  
Fully Coupled

Abstract. Assessments of future climate-warming-induced seafloor methane (CH4) release rarely include anaerobic oxidation of methane (AOM) within the sediments. Considering that more than 90 % of the CH4 produced in ocean sediments today is consumed by AOM, this may result in substantial overestimations of future seafloor CH4 release. Here, we integrate a fully coupled AOM module with a numerical hydrate model to investigate under what conditions rapid release of CH4 can bypass AOM and result in significant fluxes to the ocean and atmosphere. We run a number of different model simulations for different permeabilities and maximum AOM rates. In all simulations, a future climate warming scenario is simulated by imposing a linear seafloor temperature increase of 3 ∘C over the first 100 years. The results presented in this study should be seen as a first step towards understanding AOM dynamics in relation to climate change and hydrate dissociation. Although the model is somewhat poorly constrained, our results indicate that vertical CH4 migration through hydraulic fractures can result in low AOM efficiencies. Fracture flow is the predicted mode of methane transport under warming-induced dissociation of hydrates on upper continental slopes. Therefore, in a future climate warming scenario, AOM might not significantly reduce methane release from marine sediments.

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