FN Archimer Export Format
PT J
TI Resupply of mesopelagic dissolved iron controlled by particulate iron composition
BT 
AF Bressac, M.
   Guieu, C.
   Ellwood, M. J.
   Tagliabue, A.
   Wagener, T.
   Laurenceau-Cornec, E. C.
   Whitby, Hannah
   Sarthou, Geraldine
   Boyd, P. W.
AS 1:1,2;2:2,3;3:4;4:5;5:6;6:1;7:7;8:9;9:1,8;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia
   Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, Villefranche-sur-Mer, France
   The Center for Prototype Climate Modeling, New York University in Abu Dhabi, Abu Dhabi, United Arab Emirates
   Research School of Earth Sciences, Australian National University, Canberra, Australian Capital Territory, Australia
   Department of Earth Ocean and Ecological Sciences, School of Environmental Sciences, University of Liverpool, Liverpool, UK
   Aix Marseille Université, CNRS, IRD, Université de Toulon, MIO UM 110, Marseille, France
   UMR 6539/LEMAR/IUEM, CNRS, UBO, IRD, Ifremer, Technopôle Brest Iroise, Plouzané, France
   Antarctic Climate and Ecosystems Collaborative Research Center, University of Tasmania, Hobart, Tasmania, Australia
   UMR 6539/LEMAR/IUEM, CNRS, UBO, IRD, Ifremer, Technopôle Brest Iroise, Plouzané, France
C2 UNIV TASMANIA, AUSTRALIA
   UNIV PARIS 06, FRANCE
   UNIV NEW YORK, UNITED ARAB EMIRATES
   UNIV AUSTRALIAN NATL, AUSTRALIA
   UNIV LIVERPOOL, UK
   UNIV AIX MARSEILLE, FRANCE
   UBO, FRANCE
   ACE CRC, AUSTRALIA
   CNRS, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 13.566
TC 26
UR https://archimer.ifremer.fr/doc/00589/70156/87017.pdf
LA English
DT Article
CR PEACETIME
BO Pourquoi pas ?
AB The dissolved iron supply controls half of the oceans’ primary productivity. Resupply by the remineralization of sinking particles, and subsequent vertical mixing, largely sustains this productivity. However, our understanding of the drivers of dissolved iron resupply, and their influence on its vertical distribution across the oceans, is still limited due to sparse observations. There is a lack of empirical evidence as to what controls the subsurface iron remineralization due to difficulties in studying mesopelagic biogeochemistry. Here we present estimates of particulate transformations to dissolved iron, concurrent oxygen consumption and iron-binding ligand replenishment based on in situ mesopelagic experiments. Dissolved iron regeneration efficiencies (that is, replenishment over oxygen consumption) were 10- to 100-fold higher in low-dust subantarctic waters relative to higher-dust Mediterranean sites. Regeneration efficiencies are heavily influenced by particle composition. Their make-up dictates ligand release, controls scavenging, modulates ballasting and may lead to the differential remineralization of biogenic versus lithogenic iron. At high-dust sites, these processes together increase the iron remineralization length scale. Modelling reveals that in oceanic regions near deserts, enhanced lithogenic fluxes deepen the ferricline, which alter the vertical patterns of dissolved iron replenishment, and set its redistribution at the global scale. Such wide-ranging regeneration efficiencies drive different vertical patterns in dissolved iron replenishment across oceanic provinces. 
PY 2019
PD DEC
SO Nature Geoscience
SN 1752-0894
PU Springer Science and Business Media LLC
VL 12
IS 12
UT 000499653700009
BP 995
EP 1000
DI 10.1038/s41561-019-0476-6
ID 70156
ER

EF