FN Archimer Export Format
PT J
TI The effect of temperature on the release of silicon, iron and manganese into seawater from resuspended sediment particles
BT 
AF Liao, Wen-Hsuan
   Planquette, Helene
   Moriceau, Brivaela
   Lambert, Christophe
   Desprez de Gesincourt, Floriane
   Laurenceau-Cornec, Emmanuel
   Sarthou, Geraldine
   Gorgues, Thomas
AS 1:1,2,3;2:1;3:1;4:1;5:1;6:1;7:1;8:4;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 CNRS, Univ Brest, IRD, Ifremer, LEMAR, Plouzané, France
   Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan
   Department of Ocean Systems (OCS), Royal Netherlands Institute for Sea Research (NIOZ), Texel, The Netherlands
   LOPS, IUEM, IRD, Ifremer, CNRS, Université de Brest, Brest, France
C2 CNRS, FRANCE
   UNIV NATL CHENG KUNG, TAIWAN
   NIOZ, NETHERLANDS
   IRD, FRANCE
UM LOPS
   LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-int-hors-europe
IF 5
TC 2
UR https://archimer.ifremer.fr/doc/00835/94671/102068.pdf
   https://archimer.ifremer.fr/doc/00835/94671/102257.pdf
   https://archimer.ifremer.fr/doc/00835/94671/102258.xlsx
LA English
DT Article
CR HERMINE
   MD 145 / KEOPS
BO Pourquoi pas ?
   Marion Dufresne
DE ;Sediment;Fe isotopes;Temperature;GEOTRACES
AB Sediments are considered to be refractory materials with limited influences on dissolved iron (dFe) pool in the ocean. However, recent field observations and laboratory experiments suggest that iron released from resuspended sediment particles and transported from continental margins is prone to fertilize large areas of the world ocean. Here we conducted a dissolution experiment to quantify the amount of dFe released from two types of resuspended sediments (silicate and calcite-rich) to open ocean surface seawater under two temperatures (5 and 15 °C). We followed pH, dissolved oxygen (dO2), phosphate, silicate, dissolved Fe and Mn concentrations (dFe and dMn), and bacterial abundance over 250 days. Extremely low and undetectable phosphate concentrations (< 50 pmol kg-1) were measured throughout the duration of the experiment, causing limited bacteria growth and stable pH and dissolved O2 concentrations under all conditions. Silicate and dFe concentrations increased through time and high temperature (15 °C) induced more iron dissolution from the two sediments than low temperature (5 °C). Temperature had no effect on the dissolution of Mn. Our results further show that Fe and Mn are not released concurrently from the sediment source and that their distribution can be very different. Scavenging of Fe likely caused a decrease of dFe observed during the experiment, which was probably linked to the formation of Mn oxides. We also observed elevated dissolved Fe isotope ratios after dissolution, around +0.16 to +0.27 ‰. Isotopically heavy Fe was released from sediments to the dissolved pool during the dissolution but no difference in Fe isotope ratios was observed between the two temperature conditions. The Fe isotope fractionation can likely be attributed to ligand complexation and scavenging of Fe. These two mechanisms can be important factors not only in controlling the amount of Fe released from sediments but also in fractionating Fe isotopes at the sediment-seawater boundary. 
PY 2023
PD JUL
SO Geochimica Et Cosmochimica Acta
SN 0016-7037
PU Elsevier BV
VL 351
UT 000998292400001
BP 1
EP 13
DI 10.1016/j.gca.2023.04.014
ID 94671
ER

EF