Quantitative analysis of anaerobic oxidation of methane (AOM) in marine sediments: A modeling perspective

Regnier, Pierre; Dale, Andy W.; Arndt, Sandra; LaRowe, Douglas E.; Mogollón, José M; Cappellen, Philippe Van

doi:10.1016/j.earscirev.2011.01.002

Cited by 173 publications

(196 citation statements)

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“…At an initial steady state, without external input of methane, the SMTZ was probably localized at a certain depth within the sediment ("passive SMTZ" of Regnier et al, 2011) while the upper part of the sediment was normally oxygenated. In a second stage, a burst of methane from below rose up into the subseafloor oxic zone.…”

Section: Element 1 Of the Elementary Sequence: Corrosion Surfacementioning

confidence: 99%

“…Later, Roberts (2001) demonstrated that seep carbonate facies were controlled by the hydrocarbon flux dynamics and by the depth of the SMTZ in the sediment (Roberts, 2001). Regnier et al (2011) showed that seep carbonates could precipitate at the seabed if the methane flux were sufficient to exceed the rate of sulfate diffusion into the sediment or within the subseafloor at diffusion rates. Paull and Ussler (2008) also reported that migrating gas could shift the SMTZ upward and precipitate a greater amount of carbonate.…”

Section: Introductionmentioning

confidence: 99%

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Mechanisms of biogenic gas migration revealed by seep carbonate paragenesis, Panoche Hills, California

Blouet¹,

Imbert²,

Foubert³

2017

Bulletin

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A comprehensive study of seep carbonates at the top of the organic-rich Maastrichtian to Danian Moreno Formation in the Panoche Hills (California) reveals the mechanisms of generation, expulsion, and migration of biogenic methane that fed the seeps. Two selected outcrops show that seep carbonates developed at the tip of sand dykes intrude up into the Moreno Formation from deeper sandbodies. Precipitation of methane-derived cements occurred in a succession of up to 10 repeated elementary sequences, each starting with a corrosion surface followed by dendritic carbonates, botryoidal aragonite, aragonite fans, and finally laminated micrite. Each element of the sequence reflects three stages. First, a sudden methane pulse extended up into the oxic zone of the sediments, leading to aerobic oxidation of methane and carbonate dissolution. Second, after consumption of the oxygen, anaerobic oxidation of methane coupled with sulfate reduction triggered carbonate precipitation. Third, progressive diminishment of the methane seepage led to the deepening of the reaction front in the sediment and the lowering of precipitation rates. Carbonate isotopes, with d 13 C as low as -51‰ Peedee belemnite, indicate a biogenic origin for the methane, whereas a one-dimensional basin model suggests that the Moreno Formation was in optimal thermal conditions for bacterial methane generation at the time of seep carbonate precipitation. Methane pulses are interpreted to reflect drainage by successive episodes of sand injection into the gas-generating shale of the Moreno Formation. The seep carbonates of the Panoche Hills can thus be viewed as a record of methane production from a biogenic source rock by multiphase hydraulic fracturing. A U T H O R S

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Section: Element 1 Of the Elementary Sequence: Corrosion Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanisms of biogenic gas migration revealed by seep carbonate paragenesis, Panoche Hills, California

Blouet¹,

Imbert²,

Foubert³

2017

Bulletin

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“…Constraining reactivity rates is crucial as it determines the sediment burial and recycling efficiencies (Martin and Bender, 1988;Soetaert et al, 1996), which allow the quantification of benthic-pelagic solute fluxes and, ultimately, feedbacks on ocean chemistry. Organic matter reactivity controls the nature and magnitude of the electron acceptor sinks from the water column: close to the sediment surface underlying oxic waters POM will be mainly respired aerobically and through denitrification, whereas deeper within the sediment it will mainly be mineralised through anaerobic pathways such as sulphate-reduction and methanogenesis (Regnier et al, 2011).…”

Section: Reactivity Of Organic Materialsmentioning

confidence: 99%

Modelling Marine Sediment Biogeochemistry: Current Knowledge Gaps, Challenges, and Some Methodological Advice for Advancement

et al. 2018

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The benthic environment is a crucial component of marine systems in the provision of ecosystem services, sustaining biodiversity and in climate regulation, and therefore important to human society. With the contemporary increase in computational power, model resolution and technological improvements in quality and quantity of benthic data, it is necessary to ensure that benthic systems are appropriately represented in coupled benthic-pelagic biogeochemical and ecological modelling studies. In this paper we focus on five topical challenges related to various aspects of modelling benthic environments: organic matter reactivity, dynamics of benthic-pelagic boundary layer, microphytobenthos, biological transport and small-scale heterogeneity, and impacts of episodic events. We discuss current gaps in their understanding and indicate plausible ways ahead. Further, we propose a three-pronged approach for the advancement of benthic and benthic-pelagic modelling, essential for improved understanding, management and prediction of the marine environment. This includes: (A) development of a traceable and hierarchical framework for benthic-pelagic models, which will facilitate integration among models, reduce risk of bias, and clarify model limitations; (B) extended cross-disciplinary approach to promote effective collaboration between modelling and empirical scientists of various backgrounds and better involvement of stakeholders and end-users; (C) a common vocabulary for terminology used in benthic modelling, to promote model development and integration, and also to enhance mutual understanding.

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“…Regnier et al, 2011). Furthermore, they incorporate various mineral dissolution and precipitation reactions, as well as fast equilibrium sorption processes for example of NH 4 , PO 4 and metal ions (i.e.…”

Section: +mentioning

confidence: 99%

OMEN-SED 0.9: A novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models

Hülse¹,

Arndt²,

Daines³

et al. 2018

Preprint

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Abstract. We present the first version of OMEN-SED (Organic Matter ENabled SEDiment model), a new, one-dimensional analytical early diagenetic model resolving organic matter cycling and associated biogeochemical dynamics in marine sediments designed to be coupled to Earth system models. OMEN-SED explicitly describes organic matter (OM) cycling as well as associated dynamics of the most important terminal electron acceptors (i.e. O 2 , NO 3 , SO 4 ) and methane (CH 4 ), related reduced substances (NH 4 , H 2 S), macronutrients (PO 4 ) and associated pore water quantities (ALK, DIC). Its reaction network 5 accounts for the most important primary and secondary redox reactions, equilibrium reactions, mineral dissolution and precipitation, as well as adsorption and desorption processes associated with OM dynamics that affect the dissolved and solid species explicitly resolved in the model. To represent a redox-dependent sedimentary P cycle we also include a representation of the formation and burial of Fe-bound P and authigenic Ca-P minerals. Thus, OMEN-SED is able to capture the main features of diagenetic dynamics in marine sediments and, therefore, offers similar predictive abilities than a complex, numerical diagenetic 10 model. Yet, its computational efficiency allows its coupling to global Earth system models and therefore the investigation of coupled global biogeochemical dynamics over a wide range of climate relevant timescales. This paper provides a detailed description of the new sediment model, an extensive sensitivity analysis, as well as an evaluation of OMEN-SED's performance through comprehensive comparisons with observations and results from a more complex numerical model. We find solid phase and dissolved pore water profiles for different ocean depths are reproduced with good accuracy and simulated terminal electron 15 acceptor fluxes fall well within the range of globally observed fluxes. Finally, we illustrate its application in an Earth system model framework by coupling OMEN-SED to the Earth system model cGENIE and tune the OM degradation rate constants to optimise the fit of simulated benthic OM contents to global observations. We find simulated sediment characteristics of the coupled model framework, such as OM degradation rates, oxygen penetration depths and sediment-water interface fluxes are generally in good agreement with observations and in line with what one would expect on a global scale. Coupled to an 20 Earth system model, OMEN-SED is thus a powerful tool that will not only help elucidate the role of benthic-pelagic exchange processes in the evolution and, in particular, the termination of a wide range of climate events, but will also allow a direct comparison of model output with the sedimentary record -the most important climate archive on Earth. 1Geosci. Model Dev. Discuss., https://doi

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Quantitative analysis of anaerobic oxidation of methane (AOM) in marine sediments: A modeling perspective

Cited by 173 publications

References 162 publications

Mechanisms of biogenic gas migration revealed by seep carbonate paragenesis, Panoche Hills, California

Mechanisms of biogenic gas migration revealed by seep carbonate paragenesis, Panoche Hills, California

Modelling Marine Sediment Biogeochemistry: Current Knowledge Gaps, Challenges, and Some Methodological Advice for Advancement

OMEN-SED 0.9: A novel, numerically efficient organic matter sediment diagenesis module for coupling to Earth system models

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