FN Archimer Export Format
PT J
TI A first assessment of organic carbon burial in the West Gironde Mud Patch (Bay of Biscay)
BT 
AF Dubosq, Nicolas
   Schmidt, Sabine
   Walsh, J.P.
   Grémare, Antoine
   Gillet, Hervé
   Lebleu, Pascal
   Poirier, Dominique
   Perello, Marie-Claire
   Lamarque, Bastien
   Deflandre, Bruno
AS 1:1;2:2;3:3;4:1;5:1;6:1;7:1;8:1;9:1;10:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Univ. Bordeaux, CNRS, EPOC, EPHE, UMR 5805, F-33615, Pessac, France
   CNRS, Univ. Bordeaux, EPOC, EPHE, UMR 5805, F-33615, Pessac, France
   Coastal Resources Center, University of Rhode Island, Kingstown, RI 02881, USA
C2 UNIV BORDEAUX, FRANCE
   CNRS, FRANCE
   UNIV RHODE ISLAND, USA
IF 2.629
TC 6
UR https://archimer.ifremer.fr/doc/00688/80054/83057.pdf
LA English
DT Article
CR JERICOBENT
   JERICOBENT-1
BO Côtes De La Manche
DE ;Sediment accumulation rate;Organic carbon burial;West Gironde Mud Patch;Bay of Biscay;Continental shelf
AB On the Bay of Biscay continental shelf, there are several mid-shelf mud patches including La Grande Vasière to the north, the West Gironde Mud Patch (WGMP) off the Gironde estuary and the Basque Mud Patch close to the Spanish border. In general, these deposits are several meters thick and cover coarser substrate. Questions remain about their storage capability for fine particles and carbon. This work investigates the sedimentation of the WGMP in order to develop a first estimate of organic carbon (OC) burial. Interface sediment cores were collected at nine stations along two cross-shelf transects in October–November 2016. X-radiograph imaging and grain-size analyses were used to characterize sedimentary structures. 210Pbxs depth profiles were established to calculate sediment (SAR) and mass (MAR) accumulation rates. Sedimentary structures indicate episodic sandy inputs overlying older deposits at proximal sites, and relatively continuous sedimentation at seaward locations. On the outer-central portion of the northern transect, a maximum SAR (0.47 cm yr−1) was observed, suggesting a depocenter. On the southern transect, excluding two stations where sedimentary inputs appear massive but sporadic, the SARs are lower (<0.3 cm yr−1). Quantitative estimates of OC burial rates increase seaward with a maximum of 45 gC m−2 yr−1. To evaluate carbon loading independent of grain-size variability, OC values were normalized to surface area of sediments (SA). Interestingly, a qualitative comparison of OC burial efficiencies using the OC/SA ratio highlights three groups of sites (low, medium and relatively high OC burial efficiency) which are likely related both to different sedimentary environments and variable deposition conditions linked to local environmental conditions and depth. This work highlights the likely control of hydrodynamic intensity and sedimentary inputs on the amount of OC stored in the WGMP sediments. 
PY 2021
PD MAY
SO Continental Shelf Research
SN 0278-4343
PU Elsevier BV
VL 221
UT 000651263700002
DI 10.1016/j.csr.2021.104419
ID 80054
ER

EF