FN Archimer Export Format
PT J
TI Contribution of resuspended sedimentary particles to dissolved iron and manganese in the ocean: An experimental study
BT 
AF CHEIZE, Marie
   Planquette, H.F.
   Fitzsimmons, J.N.
   Pelleter, Ewan
   Sherrell, R.M.
   LAMBERT, Christophe
   Bucciarelli, E.
   Sarthou, G.
   Le Goff, Marion
   Liorzou, Celine
   Chéron, Sandrine
   Viollier, E.
   Gayet, Nicolas
AS 1:1,2;2:1;3:3,4;4:2;5:3;6:1;7:1;8:1;9:1;10:5;11:2;12:6;13:7;
FF 1:PDG-REM-GM-LCG;2:;3:;4:PDG-REM-GM-LCG;5:;6:;7:;8:;9:;10:;11:PDG-REM-GM-LCG;12:;13:PDG-REM-EEP-LEP;
C1 Institut Universitaire Européen de la Mer, Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR 6539 CNRS, UBO, IRD, Ifremer, Place Nicolas Copernic, 29280 Plouzané, France
   Ifremer, Centre de Brest, Géosciences Marines, Laboratoire des Cycles Géochimiques (LCG), 29280 Plouzané, France
   Department of Marine and Coastal Sciences, Department Earth and Planetary Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901-8521, United States
   Department of Oceanography, Texas A&M University, 403A Eller O&M Building, 3146 TAMU, College Station, TX 77843-3146, United States
   Institut Universitaire Européen de la Mer, Laboratoire Géosciences Océan (LGO), UMR 6538 UMS 3113, Place Nicolas Copernic, 29280 Plouzané, France
   Institut de Physique Globe de Paris, Biogéochimie Environnementale, 1, rue Jussieu, 75238 Paris cedex 05, France
   Ifremer, Centre de Brest, Laboratoire Environnement Profond, (LEP), 29280, Plouzané, France
C2 UBO, FRANCE
   IFREMER, FRANCE
   UNIV RUTGERS STATE, USA
   UNIV TEXAS A&M, USA
   CNRS, FRANCE
   IPGP, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LCG
   PDG-REM-EEP-LEP
UM LEMAR
   LGO
IN WOS Ifremer UPR
   WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 3.362
TC 22
UR https://archimer.ifremer.fr/doc/00460/57197/59166.pdf
LA English
DT Article
CR MD 145 / KEOPS
   MD 188 / KEOPS 2
BO Marion Dufresne
DE ;Suspended particle dissolution;Sediment;Iron;Manganese;Biogenic silica;Southern Ocean;Kerguelen
AB A number of trace metals play essential roles in marine ecosystem structure and biological productivity. Until recently, it has been argued that phytoplankton access primarily dissolved iron, while particulate iron was considered a refractory material with little use biologically and limited interaction with the dissolved pool. In order to assess the transfer mechanisms between sediment-sourced particulate trace metals and the dissolved pool, we conducted a 14-month incubation that reacted resuspended sediments with natural seawater, both originating from the Kerguelen area (KEOPS cruises; Southern Ocean), in the dark, and at concentrations replicating natural conditions. Three types of sediments were investigated (named BioSi, BioSi + Ca, and Basalt), mostly composed of (i) biogenic silica (bSiO2), (ii) bSiO2 and calcite, and (iii) basaltic fragments, respectively. The release of dissolved silicon (dSi), iron (dFe) and manganese (dMn) was monitored regularly throughout the incubation, as well as living bacteria density and Fe organic ligands. Depending on the origin and composition of the sediment, unique dFe and dMn fluxes were observed, including a strong decoupling between dFe and dMn. The basaltic sediment released up to 1.09 ± 0.04 nmol L−1 of dFe and 0.28 ± 0.09 nmol L−1 of dMn, while the biogenic sediments released a higher 3.91 ± 0.04 nmol L−1 and 8.03 ± 0.42 nmol L−1 of dFe and dMn, respectively. Several factors influencing the release and removal of dFe and dMn were discernable at the temporal sampling resolution of the incubation, including the structural composition of the sediment, bacterial abundance, and the formation of manganese oxides. The regular sampling over short timescales and the extended sampling over one year proved to be critical to constrain the processes and exchanges that govern the contribution of the particulate to the dissolved pools. Overall, this incubation provides a strong basis for reassessing the role of resuspended sedimentary particles in the marine biogeochemical cycles of Fe and Mn. Indeed, we show that biogenic silica, calcite-rich and basaltic particles can contribute substantial dissolved Fe and Mn to the overlying water column. In the future, the global extent of this previously overlooked external metal source should be quantified through further process studies and biogeochemical models. 
PY 2019
PD APR
SO Chemical Geology
SN 0009-2541
PU Elsevier BV
VL 511
UT 000462772400028
BP 389
EP 415
DI 10.1016/j.chemgeo.2018.10.003
ID 57197
ER

EF