Vertical distribution of methane oxidation and methanotrophic response to elevated methane concentrations in stratified waters of the Arctic fjord Storfjorden (Svalbard, Norway)
TLDR
In this article, a combination of radio-tracer-based incubation assays, stable C-CH4 isotope measurements, and molecular tools (16S rRNA gene Denaturing Gradient Gel Electrophoresis (DGGE) fingerprinting, pmoA- and mxaF gene analyses) were used to investigate the bacterially mediated aerobic methane oxidation (MOx) in the Arctic fjord Storfjorden (Svalbard).Abstract:
. The bacterially mediated aerobic methane oxidation (MOx) is a key mechanism in controlling methane (CH4) emissions from the world's oceans to the atmosphere. In this study, we investigated MOx in the Arctic fjord Storfjorden (Svalbard) by applying a combination of radio-tracer-based incubation assays (3H-CH4 and 14C-CH4), stable C-CH4 isotope measurements, and molecular tools (16S rRNA gene Denaturing Gradient Gel Electrophoresis (DGGE) fingerprinting, pmoA- and mxaF gene analyses). Storfjorden is stratified in the summertime with melt water (MW) in the upper 60 m of the water column, Arctic water (ArW) between 60 and 100 m, and brine-enriched shelf water (BSW) down to 140 m. CH4 concentrations were supersaturated with respect to the atmospheric equilibrium (about 3–4 nM) throughout the water column, increasing from ∼20 nM at the surface to a maximum of 72 nM at 60 m and decreasing below. MOx rate measurements at near in situ CH4 concentrations (here measured with 3H-CH4 raising the ambient CH4 pool byread more
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The interaction of climate change and methane hydrates
TL;DR: The synergy between warming climate and gas hydrate dissociation feeds a popular perception that global warming could drive catastrophic methane releases from the contemporary gas hydrates reservoir as mentioned in this paper, but no conclusive proof that hydrate-derived methane is reaching the atmosphere now, but more observational data and improved numerical models will better characterize the climate-hydrate synergy in the future.
Journal ArticleDOI
Micro-aerobic bacterial methane oxidation in the chemocline and anoxic water column of deep south-Alpine Lake Lugano (Switzerland)
Jan Blees,Helge Niemann,Christine B. Wenk,Jakob Zopfi,Carsten J. Schubert,Mathias K. Kirf,Mauro Veronesi,Carmen Hitz,Moritz F. Lehmann +8 more
TL;DR: In this article, seasonal variations in the vertical distribution of methane concentration, methane oxidation rates, and lipid biomarkers in the northern basin of Lake Lugano were measured, and it was shown that the conspicuous methane concentration gradients are primarily driven by (micro-)aerobic methane oxidation (MOx) below the chemocline.
Journal ArticleDOI
Widespread methane seepage along the continental margin off Svalbard - from Bjørnøya to Kongsfjorden
Susan Mau,Miriam Römer,Marta E Torres,Ingeborg Bussmann,Thomas Pape,Ellen Damm,Patrizia Geprägs,Paul Wintersteller,Chieh-Wei Hsu,Markus Loher,Gerhard Bohrmann +10 more
TL;DR: Findings of a much broader seepage area extending from 74° to 79° are reported, where more than a thousand gas discharge sites were imaged as acoustic flares, and it is postulate that the gas ascends along this fracture zone.
Journal ArticleDOI
Reviews and syntheses: Four decades of modeling methane cycling in terrestrial ecosystems
Xiaofeng Xu,Xiaofeng Xu,Xiaofeng Xu,Fengming Yuan,Paul J. Hanson,Stan D. Wullschleger,Peter E. Thornton,William J. Riley,Xia Song,Xia Song,David E. Graham,Changchun Song,Hanqin Tian +12 more
TL;DR: In this paper, the authors summarize 40 terrestrial CH4 models to characterize their strengths and weaknesses and suggest a roadmap for future model improvement and application, with an emphasis on improving and validating individual CH4 processes over depth and horizontal space.
Journal ArticleDOI
Effects of climate change on methane emissions from seafloor sediments in the Arctic Ocean: A review
Rachael H. James,Philippe Bousquet,Ingeborg Bussmann,Matthias Haeckel,Rolf Kipfer,Rolf Kipfer,Ira Leifer,Helge Niemann,Ilia Ostrovsky,Jacek Piskozub,Gregor Rehder,Tina Treude,Lisa Vielstädte,Jens Greinert,Jens Greinert,Jens Greinert +15 more
TL;DR: In this paper, the principal physical and biogeochemical processes that regulate methane fluxes across the seabed, the fate of this methane in the water column, and potential for its release to the atmosphere are reviewed.
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