FN Archimer Export Format
PT J
TI Processes Driving Iron and Manganese Dispersal From the TAG Hydrothermal Plume (Mid-Atlantic Ridge): Results From a GEOTRACES Process Study
BT 
AF González-Santana, David
   Planquette, Helene
   Cheize, Marie
   Whitby, Hannah
   Gourain, Arthur
   Holmes, Thomas
   Guyader, Vivien
   Cathalot, Cecile
   Pelleter, Ewan
   Fouquet, Yves
   Sarthou, Geraldine
AS 1:1;2:1;3:1,2;4:1;5:3;6:4;7:2;8:2;9:2;10:2;11:1;
FF 1:;2:;3:PDG-REM-GM-LCG;4:;5:;6:;7:PDG-REM-GM-LCG;8:PDG-REM-GM-LCG;9:PDG-REM-GM-LCG;10:PDG-REM-GM-LCG;11:;
C1 CNRS, IRD, Ifremer, LEMAR, University of Brest, Plouzané, France
   Ifremer, Géosciences Marine, LCG, Plouzané, France
   Department of Ocean Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, United Kingdom
   The Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS, Australia
C2 CNRS, FRANCE
   IFREMER, FRANCE
   UNIV LIVERPOOL, UK
   UNIV TASMANIA, AUSTRALIA
SI BREST
SE PDG-REM-GM-LCG
UM LEMAR
IN WOS Ifremer UPR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-europe
   copubli-int-hors-europe
IF 5.247
TC 13
UR https://archimer.ifremer.fr/doc/00643/75530/76431.pdf
   https://archimer.ifremer.fr/doc/00643/75530/76432.xlsx
LA English
DT Article
CR HERMINE
BO Pourquoi pas ?
DE ;iron;manganese;hydrothermal;TAG;Mid Atlantic Ridge;GEOTRACES
AB Hydrothermal vents are a recognized source of trace elements to the ocean inventory. Nevertheless, the contribution of slow-spreading ridges remains poorly resolved. To address this, high-resolution dissolved (<0.45 μm) iron (dFe) and manganese (dMn) samples were collected during the GEOTRACES HERMINE GApr07 process study at the Mid Atlantic Ridge. Samples were collected at nine stations, from the TAG vent site to 75 km south-southwest following the neutrally buoyant plume. Concentrations of dMn and dFe ranged from 71 ± 6 and 51 ± 2 nmol kg–1 right above the vent site to 0.43 ± 0.01 and 1.56 ± 0.02 nmol kg–1 at the most distal station, respectively. Using a 5-box model coupled with our data, we show that as the plume traveled away from the vent, aggregation processes controlled dFe concentrations in the first 2 km, with an aggregation rate averaging between 8.0 ± 0.6 and 0.11 ± 0.04 nmol L–1 d–1, respectively in the first and second kilometer. Aggregation, likely of small colloidal particles, led to partitioning of the size fractionated Fe pool, as 6% of the dFe was moved into the particulate size fraction. Further away, disaggregation processes became more prevalent, with rates ranging from 0.27 ± 0.02 to 0.008 ± 0.001 nmol L–1 d–1, enriching the dFe pool by 10%. The computed decrease of hydrothermal Fe within the neutrally buoyant plume was likely caused by flocculation of small Fe oxyhydroxide particles. This process resulted in Fe aggregate formation with radii estimated to range between 14 and 20 μm in the first km from TAG. Between 2 and 30 km from the vent site, the radii ranged between 2 and 4 μm. 
PY 2020
PD JUN
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 7
UT 000550282300001
DI 10.3389/fmars.2020.00568
ID 75530
ER

EF