FN Archimer Export Format
PT J
TI Impact of inorganic particles of sedimentary origin on global dissolved iron and phytoplankton distribution
BT 
AF Beghoura, H.
   Gorgues, Thomas
   Aumont, Olivier
   Planquette, Helene
   Tagliabue, A.
   Auger, P.‐A.
AS 1:1;2:1;3:2;4:3;5:4;6:1,5;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ. Brest, CNRS, IRD, Ifremer, Laboratoire d’Océanographie Physique et Spatiale (LOPS), IUEM Brest, France
   Sorbonne Université, UPMC Université Paris VI, CNRS, IRD, MNHN, UMR7159 LOCEAN‐IPSL Paris ,France
   Laboratoire des Sciences de l’Environnement Marin (LEMAR), CNRS, UBO, IRD, Ifremer Plouzané ,France
   Department of Earth, Ocean & Ecological Sciences, School of Environmental Sciences University of Liverpool Liverpool, UK
   Instituto Milenio de Oceanografía (IMO) and Escuela de Ciencias del Mar Pontificia Universidad Católica de Valparaíso Valparaíso ,Chile
C2 UBO, FRANCE
   IRD, FRANCE
   CNRS, FRANCE
   UNIV LIVERPOOL, UK
   UNIV VALPARAISO, CHILE
UM LOPS
   LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-int-hors-europe
IF 3.559
TC 8
UR https://archimer.ifremer.fr/doc/00591/70270/68330.pdf
LA English
DT Article
AB Iron is known to be the limiting nutrient for the phytoplankton growth over ~40% of the global ocean and to impact the structure of marine ecosystems. Dissolved iron (DFe) is assumed to be the only form available to phytoplankton while particulate iron (PFe) has mostly been considered for its role in the biogenic iron remineralization and induced scavenging. Therefore, most studies focused on the nature of DFe external sources to the ocean (i.e. aeolian dust, riverine fluxes, hydrothermal sources and sediment) and their quantification, which still remain uncertain. Among these external sources, the sedimentary sources have been shown to be underestimated. Moreover, the iron supply from sediments has been documented to be often larger in the particle fraction. Here, we test the impacts of an iron sediment source of inorganic particulate iron (PFeInorg) on global DFe and phytoplankton distribution. We use experimentally acquired knowledge to test a parameterization of a PFeInorg pool in a global biogeochemical model and compare with published indirect estimation. Depending on the parameterization of its dissolution and sinking speed, the PFeInorg can noticeably enrich water masses in DFe during its transport from the sediment to the open ocean, notably in regions not usually accessible to external DFe inputs. Indeed, the fact that DFe is prone to scavenging, reduces the impact of equivalent Fe inputs from sediments in the dissolved form in those regions far from the sediment sources. PFeInorg thereby has the potential to fuel the phytoplankton growth in offshore regions impacting the coastal‐offshore chlorophyll gradient. 
PY 2019
PD DEC
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU American Geophysical Union (AGU)
VL 124
IS 12
UT 000511331600007
BP 8626
EP 8646
DI 10.1029/2019JC015119
ID 70270
ER

EF