scholarly journals Novel lipid biomarkers for detecting microbial oxidation of methane in the environment

10.33540/801 ◽  
2021 ◽  
Author(s):  
◽  
Nadine Talea Smit
Keyword(s):  
Lipid Biomarkers ◽  
Microbial Oxidation ◽  
Oxidation Of Methane

scholarly journals Carbon and sulfur back flux during anaerobic microbial oxidation of methane and coupled sulfate reduction

2011 ◽  
Vol 108 (52) ◽  
pp. E1484-E1490 ◽  
Author(s):  
T. Holler ◽  
G. Wegener ◽  
H. Niemann ◽  
C. Deusner ◽  
T. G. Ferdelman ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Microbial Oxidation ◽  
Oxidation Of Methane

Microbial oxidation of methane in the sediments of central and southern Baikal

Microbiology ◽  
2014 ◽  
Vol 83 (6) ◽  
pp. 773-781 ◽  
Author(s):  
N. V. Pimenov ◽  
G. V. Kalmychkov ◽  
M. B. Veryasov ◽  
P. A. Sigalevich ◽  
T. I. Zemskaya
Keyword(s):  
Microbial Oxidation ◽  
Oxidation Of Methane

scholarly journals Measurement of microbial oxidation of methane in lake water

1974 ◽  
Vol 19 (3) ◽  
pp. 519-524 ◽  
Author(s):  
John W. M. Rudd ◽  
R. D. Hamilton ◽  
N. E. R. Campbell
Keyword(s):  
Lake Water ◽  
Microbial Oxidation ◽  
Oxidation Of Methane

A novel 1D thermo-hydro-biogeochemical hydrate model to assess the full benthic environmental impact of methane gas hydrate dissociation

2021 ◽  
Author(s):  
Maria De La Fuente ◽  
Sandra Arndt ◽  
Tim Minshul ◽  
Héctor Marín-Moreno
Keyword(s):  
Environmental Impact ◽  
Gas Hydrate ◽  
Transport Processes ◽  
Anaerobic Oxidation Of Methane ◽  
Anaerobic Oxidation ◽  
Microbial Oxidation ◽  
Saturation State ◽  
Hydrate Dissociation ◽  
Oxidation Of Methane ◽  
The Impact

<p>Large quantities of methane (CH<sub>4</sub>) are stored in gas hydrates at shallow depths within marine sediments. These reservoirs are highly sensitive to ocean warming and if destabilized could lead to significant CH<sub>4</sub> release and global environmental impacts. However, the existence of such a positive feedback loop has recently been questioned as efficient CH<sub>4 </sub>sinks within the sediment-ocean continuum likely mitigate the impact of gas hydrate-derived CH<sub>4</sub> emissions on global climate. In particular, benthic anaerobic oxidation of methane (AOM) represents an important CH<sub>4 </sub>sink capable of completely consuming CH<sub>4</sub> fluxes before they reach the seafloor. However, the efficiency of this benthic biofilter is controlled by a complex interplay of multiphase methane transport and microbial oxidation processes and is thus highly variable (0-100%). In addition, AOM potentially enhances benthic alkalinity fluxes with important, yet largely overlooked implications for ocean pH, saturation state and CO<sub>2</sub> emissions. As a consequence, the full environmental impact of hydrate-derived CH<sub>4</sub> release to the ocean-atmosphere system and its feedbacks on global biogeochemical cycles and climate still remain poorly quantified. To the best our knowledge, currently available modelling tools to assess the benthic CH<sub>4</sub> sink and its environmental impact during hydrate dissociation do not account for the full complexity of the problem. Available codes generally do not explicitly resolve the dynamics of the microbial community and thus fail to represent transient changes in AOM biofilter efficiency and windows of opportunity for CH<sub>4</sub> escape. They also highly simplify the representation of  multiphase CH<sub>4 </sub>transport processes and gas hydrate dynamics and rarely assess the influence of hydrate-derived CH<sub>4</sub> fluxes on benthic-pelagic alkalinity and dissolved inorganic carbon fluxes. To overcome these limitations, we have developed a novel 1D thermo-hydro-biogeochemical hydrate model that improve the quantitative understanding of the benthic CH<sub>4</sub> sink and benthic carbon cycle-climate feedbacks in response to methane hydrate dissociation caused by temperature and sea-level perturbations. Our mathematical model builds on previous thermo-hydraulic hydrate simulators, expanding them to include the dominant microbial processes affecting CH<sub>4</sub> fluxes in a consistent and coupled mathematical formulation. The micro-biogeochemical reaction network accounts for the main redox reactions (i.e., aerobic degradation, organoclastic sulphate reduction (OSR), methanogenesis and aerobic-anaerobic oxidation of methane (AeOM-AOM)), carbonate dissolution/precipitation and equilibrium reactions that drive biogeochemical dynamics in marine hydrate-bearing sediments . In particular, the AOM rate is expressed as a bioenergetic rate law that explicitly accounts for biomass dynamics. Finally, the model allows tracking the carbon isotope signatures of all dissolved and solid carbon species. In this talk we will present the model structure for the multiphase-multicomponent hydrate system, describe the specific constitutive and reaction equations used in the formulation, discuss the numerical strategy implemented and illustrate the potential capabilities of the model.</p>

scholarly journals Ecosystem function and services provided by the deep sea

2014 ◽  
Vol 11 (14) ◽  
pp. 3941-3963 ◽  
Author(s):  
A. R. Thurber ◽  
A. K. Sweetman ◽  
B. E. Narayanaswamy ◽  
D. O. B. Jones ◽  
J. Ingels ◽  
...  
Keyword(s):  
Deep Sea ◽  
Deep Ocean ◽  
Life Forms ◽  
Small Scale ◽  
Nutrient Regeneration ◽  
Microbial Oxidation ◽  
Global Functioning ◽  
Oxidation Of Methane ◽  
Deep Ocean Water ◽  
The Impact

Abstract. The deep sea is often viewed as a vast, dark, remote, and inhospitable environment, yet the deep ocean and seafloor are crucial to our lives through the services that they provide. Our understanding of how the deep sea functions remains limited, but when treated synoptically, a diversity of supporting, provisioning, regulating and cultural services becomes apparent. The biological pump transports carbon from the atmosphere into deep-ocean water masses that are separated over prolonged periods, reducing the impact of anthropogenic carbon release. Microbial oxidation of methane keeps another potent greenhouse gas out of the atmosphere while trapping carbon in authigenic carbonates. Nutrient regeneration by all faunal size classes provides the elements necessary for fueling surface productivity and fisheries, and microbial processes detoxify a diversity of compounds. Each of these processes occur on a very small scale, yet considering the vast area over which they occur they become important for the global functioning of the ocean. The deep sea also provides a wealth of resources, including fish stocks, enormous bioprospecting potential, and elements and energy reserves that are currently being extracted and will be increasingly important in the near future. Society benefits from the intrigue and mystery, the strange life forms, and the great unknown that has acted as a muse for inspiration and imagination since near the beginning of civilization. While many functions occur on the scale of microns to meters and timescales up to years, the derived services that result are only useful after centuries of integrated activity. This vast dark habitat, which covers the majority of the globe, harbors processes that directly impact humans in a variety of ways; however, the same traits that differentiate it from terrestrial or shallow marine systems also result in a greater need for integrated spatial and temporal understanding as it experiences increased use by society. In this manuscript we aim to provide a foundation for informed conservation and management of the deep sea by summarizing the important role of the deep sea in society.

Sign in / Sign up

Export Citation Format

Share Document