FN Archimer Export Format
PT J
TI The Aquitaine Shelf edge (Bay of Biscay): a primary outlet for microbial methane release
BT 
AF Dupré, Stephanie
   Loubrieu, Benoit
   Pierre, C.
   Scalabrin, Carla
   GUERIN, Charline
   Ehrhold, Axel
   Ogor, Andre
   Gautier, Emeric
   Ruffine, Livio
   Biville, Romain
   Saout, Johan
   Breton, C
   Floodpage, J.
   Lescanne, M.
AS 1:1;2:1;3:2;4:1;5:1;6:1;7:1;8:1;9:1;10:1;11:1;12:3;13:4;14:4;
FF 1:PDG-REM-GM-LAD;2:PDG-REM-GM-CTDI;3:;4:PDG-REM-GM-LCG;5:PDG-REM-GM-CTDI;6:PDG-REM-GM-LGS;7:PDG-REM-GM-CTDI;8:PDG-REM-GM-LGS;9:PDG-REM-GM-LCG;10:PDG-REM-GM-CTDI;11:PDG-REM-GM-CTDI;12:;13:;14:;
C1 IFREMER, Unité Géosciences Marines; Plouzané, France
   LOCEAN/IPSL, CNRS-IRD-MNHN-Sorbonne Université; Paris cedex 05 , France
   ECCO; France
   TOTAL SA, Centre scientifique et technique Jean-Féger; Pau cedex, France
C2 IFREMER, FRANCE
   IPSL, FRANCE
   ECCO, FRANCE
   TOTAL-CSTJF, FRANCE
SI BREST
SE PDG-REM-GM-LAD
   PDG-REM-GM-CTDI
   PDG-REM-GM-LCG
   PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-france
IF 4.72
TC 6
UR https://archimer.ifremer.fr/doc/00618/72982/72057.pdf
   https://archimer.ifremer.fr/doc/00618/72982/72058.pdf
LA English
DT Article
CR GAZCOGNE1
   GAZCOGNE2
BO Le Suroît
   Pourquoi pas ?
DE ;microbial methane;continental shelf;fluid emissions;high-resolution acoustics;Aquitaine Margin;methane-derived authigenic carbonates
AB A few thousand (2612) seeps are releasing microbial methane bubbles from the seafloor at the Aquitaine Shelf edge (Bay of Biscay) at shallow water depths (140‐220 m). This methane contributes to the formation of meter‐scale subcircular carbonate structures, which are (sub‐)outcropping over 375 km2. Based on in situ flow rate measurements and acoustic data, and assuming steady and continuous fluxes over time, the methane entering the water column is estimated to 144 Mg/yr. Microbial methane circulation has been on‐going for at least a few thousand years. This discovery highlights the importance of microbial methane generation, disconnected from deep thermogenic sources and gas hydrates, at continental shelves. The shelf edge may be viewed as a focus area for methane circulation and release and related diagenesis, all having an impact on the shaping of continental shelves and potentially on the oceanic and atmospheric carbon budget. Plain Language Summary At the Aquitaine Shelf of the Bay of Biscay (Northeast Atlantic Ocean), the recent acoustic, chemical, and visual investigations of microbial methane release at the seafloor have led to the discovery of a vast fluid system. This methane escapes as bubbles from the seafloor into the seawater at 2612 sites, all located at shallow water depths (140‐220 m) along the edge of the continental shelf. Methane‐derived authigenic carbonates that are by‐products of gas seepage cover the (sub‐)seafloor over a large area of 375 km2. These carbonates form subcircular meter‐scale pavements and mounds, less than 2 m in height above the surrounding seafloor. Based on the growth rate of authigenic carbonates, it can be inferred that methane circulation has occurred for at least a few thousand years. The amount of methane released from the Aquitaine Shelf seafloor into the water column, estimated at 144 t/yr, questions the fate of the methane in the ocean and its possible passage to the atmosphere with therefore consequent potential contribution to the oceanic and atmospheric carbon budget over time. 
PY 2020
PD APR
SO Geophysical Research Letters
SN 0094-8276
PU American Geophysical Union (AGU)
VL 47
IS 7
UT 000560367600039
DI 10.1029/2019GL084561
ID 72982
ER

EF