FN Archimer Export Format
PT J
TI A call for refining the role of humic-like substances in the oceanic iron cycle
BT 
AF Whitby, Hannah
   Planquette, Helene
   Cassar, Nicolas
   Bucciarelli, Eva
   Osburn, Christopher L.
   Janssen, David J.
   Cullen, Jay T.
   González, Aridane G.
   Völker, Christoph
   Sarthou, Geraldine
AS 1:9,10;2:1;3:1,2;4:10;5:3;6:4,5;7:6;8:1,7;9:8;10:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 CNRS, Univ Brest, IRD, Ifremer, LEMAR, F-29280, Plouzané, France
   Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, NC, 27708, USA
   Marine, Earth, and Atmospheric Sciences, NC State University, Raleigh, NC, 27695, USA
   Institute of Ocean Sciences, Fisheries and Oceans Canada, 9860 W Saanich Rd, Sidney, BC, V8L 5T5, Canada
   University of Bern, Institute of Geological Sciences & Oeschger Center for Climate Change Research, Baltzerstrasse 1-3 3012, Bern, Switzerland
   School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, BC, V8P 5C2, Canada
   Instituto de Oceanografía y Cambio Global, IOCAG. Universidad de Las Palmas de Gran Canaria, ULPGC, Parque Científico Tecnológico de Taliarte, 35214, Telde, Spain
   Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570, Bremerhaven, Germany
   University of Liverpool, Liverpool, UK
   CNRS, Univ Brest, IRD, Ifremer, LEMAR, F-29280, Plouzané, France
C2 CNRS, FRANCE
   UNIV DUKE, USA
   UNIV N CAROLINA STATE, USA
   MPO, CANADA
   UNIV BERN, SWITZERLAND
   UNIV VICTORIA, CANADA
   IOCAG, SPAIN
   INST A WEGENER, GERMANY
   UNIV LIVERPOOL, UK
   UBO, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-europe
   copubli-int-hors-europe
IF 4.379
TC 36
UR https://archimer.ifremer.fr/doc/00622/73388/72598.pdf
   https://archimer.ifremer.fr/doc/00622/73388/72599.pdf
   https://archimer.ifremer.fr/doc/00622/73388/72600.xlsx
LA English
DT Article
CR GEOVIDE
BO Pourquoi pas ?
AB Primary production by phytoplankton represents a major pathway whereby atmospheric CO2 is sequestered in the ocean, but this requires iron, which is in scarce supply. As over 99% of iron is complexed to organic ligands, which increase iron solubility and microbial availability, understanding the processes governing ligand dynamics is of fundamental importance. Ligands within humic-like substances have long been considered important for iron complexation, but their role has never been explained in an oceanographically consistent manner. Here we show iron co-varying with electroactive humic substances at multiple open ocean sites, with the ratio of iron to humics increasing with depth. Our results agree with humic ligands composing a large fraction of the iron-binding ligand pool throughout the water column. We demonstrate how maximum dissolved iron concentrations could be limited by the concentration and binding capacity of humic ligands, and provide a summary of the key processes that could influence these parameters. If this relationship is globally representative, humics could impose a concentration threshold that buffers the deep ocean iron inventory. This study highlights the dearth of humic data, and the immediate need to measure electroactive humics, dissolved iron and iron-binding ligands simultaneously from surface to depth, across different ocean basins. 
PY 2020
PD APR
SO Scientific Reports
SN 2045-2322
PU Springer Science and Business Media LLC
VL 10
IS 1
UT 000528012400025
DI 10.1038/s41598-020-62266-7
ID 73388
ER

EF