FN Archimer Export Format
PT J
TI High variability of particulate organic carbon export along the North Atlantic GEOTRACES section GA01 as deduced from 234Th fluxes
BT 
AF LEMAITRE, Nolwenn
   PLANCHON, Frederic
   PLANQUETTE, Helene
   DEHAIRS, Frank
   FONSECA-BATISTA, Debany
   ROUKAERTS, Arnout
   DEMAN, Florian
   TANG, Yi
   MARIEZ, Clarisse
   SARTHOU, Geraldine
AS 1:1,2,3;2:2;3:2;4:3;5:3,4;6:3;7:3;8:5,6;9:2;10:2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Swiss Fed Inst Technol, Inst Geochem & Petrol, Dept Earth Sci, Zurich, Switzerland.
   IUEM, UMR 6539, Lab Sci Environm Marin LEMAR, Technopole Brest Iroise, F-29280 Plouzane, France.
   Vrije Univ Brussel, Analyt Environm & Geochem, Earth Syst Sci Res Grp, Brussels, Belgium.
   Dalhousie Univ, Oceanog Dept, Halifax, NS, Canada.
   CUNY, Grad Ctr, Earth & Environm Sci, New York, NY USA.
   CUNY, Queens Coll, Sch Earth & Environm Sci, New York, NY 10021 USA.
C2 ETH ZURICH, SWITZERLAND
   UBO, FRANCE
   UNIV VRIJE BRUSSEL, BELGIUM
   UNIV DALHOUSIE, CANADA
   UNIV CITY NEW YORK, USA
   UNIV CITY NEW YORK, USA
UM LEMAR
IN DOAJ
IF 3.951
TC 19
UR https://archimer.ifremer.fr/doc/00465/57664/59860.pdf
   https://archimer.ifremer.fr/doc/00465/57664/59861.pdf
   https://archimer.ifremer.fr/doc/00465/57664/59862.pdf
   https://archimer.ifremer.fr/doc/00465/57664/59863.pdf
LA English
DT Article
CR GEOVIDE
BO Pourquoi pas ?
AB In this study we report particulate organic carbon (POC) export fluxes for different biogeochemical basins in the North Atlantic as part of the GEOTRACES GA01 expedition (GEOVIDE, May–June 2014). Surface POC export fluxes were deduced by combining export fluxes of total Thorium-234 (234Th) with the ratio of POC to 234Th of sinking particles at the depth of export. Particles were collected in two size classes ( > 53 and 1–53µm) using in situ pumps and the large size fraction was considered representative of sinking material. Surface POC export fluxes revealed latitudinal variations between provinces, ranging from 1.4mmolm−2d−1 in the Irminger basin, where the bloom was close to its maximum, to 12mmolm−2d−1 near the Iberian Margin, where the bloom had already declined. In addition to the state of progress of the bloom, variations of the POC export fluxes were also related to the phytoplankton size and community structure. In line with previous studies, the presence of coccolithophorids and diatoms appeared to enhance the POC export flux, while the dominance of picophytoplankton cells, such as cyanobacteria, resulted in lower fluxes. The ratio of POC export to primary production (PP) strongly varied regionally and was generally low ( ≤ 14%), except at two stations located near the Iberian Margin (35%) and within the Labrador basin (38%), which were characterized by unusual low in situ PP. We thus conclude that during the GEOVIDE cruise, the North Atlantic was not as efficient in exporting carbon from the surface, as reported earlier by others. Finally, we also estimated the POC export at 100m below the surface export depth to investigate the POC transfer efficiencies. This parameter was also highly variable amongst regions, with the highest transfer efficiency at sites where coccolithophorids dominated. 
PY 2018
PD NOV
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 15
IS 21
UT 000449028700001
BP 6417
EP 6437
DI 10.5194/bg-15-6417-2018
ID 57664
ER

EF