FN Archimer Export Format
PT J
TI Modelling N2 fixation related to Trichodesmium sp.: driving processes and impacts on primary production in the tropical Pacific Ocean
BT 
AF DUTHEIL, Cyril
   AUMONT, Olivier
   GORGUES, Thomas
   LORRAIN, Anne
   BONNET, Sophie
   RODIER, Martine
   DUPOUY, Cecile
   SHIOZAKI, Takuhei
   MENKES, Christophe
AS 1:1,2;2:2;3:3;4:4;5:5;6:6;7:1,5;8:7;9:1,2;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 Ctr IRD, Noumea, New Caledonia.
   Univ Paris 06, UPMC, Sorbonne Univ, LOCEAN Lab,IPSL,CNRS,IRD,MNHN, Paris, France.
   Univ Brest, CNRS, IFREMER, IRD,LOPS, Plouzane, France.
   UBO, CNRS, IFREMER, IRD,IUEM,LEMAR,UMR 6539, Plouzane, France.
   Univ Toulon & Var, Aix Marseille Univ, CNRS, INSU,IRD,MIO,UM 110, F-13288 Marseille, France.
   Univ Polynesie Francaise, IRD, IFREMER, ILM,EIO,UMR 241, Faaa, French Polynesi, Fr Polynesia.
   Japan Agcy Marine Earth Sci & Technol, Res & Dev Ctr Global Change, Yokosuka, Kanagawa, Japan.
C2 IRD, FRANCE
   UNIV PARIS 06, FRANCE
   UBO, FRANCE
   UBO, FRANCE
   UNIV TOULON, FRANCE
   UNIV POLYNESIE FRANCAISE, FRANCE
   JAMSTEC, JAPAN
UM LOPS
   LEMAR
IN DOAJ
IF 3.951
TC 14
UR https://archimer.ifremer.fr/doc/00419/53042/53979.pdf
   https://archimer.ifremer.fr/doc/00419/53042/57672.pdf
   https://archimer.ifremer.fr/doc/00419/53042/57673.pdf
LA English
DT Article
CR BIOSOPE
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   NECTALIS-1
   NECTALIS-2
   NECTALIS-3
   NECTALIS-4
   NECTALIS-5
   OUTPACE
   PANDORA
BO L'Atalante
   Alis
AB Dinitrogen fixation is now recognized as one of the major sources of bio-available nitrogen in the ocean. Thus, N2 fixation sustains a significant part of the global primary production by supplying the most common limiting nutrient for phytoplankton growth. The Oligotrophy to UlTra-oligotrophy PACific Experiment (OUTPACE) improved the data coverage of the western tropical South Pacific, an area recently recognized as a hotspot of N2 fixation. This new development leads us to develop and test an explicit N2 fixation formulation based on the Trichodesmium physiology (the most studied nitrogen fixer) within a 3-D coupled dynamical–biogeochemical model (ROMS-PISCES). We performed a climatological numerical simulation that is able to reproduce the main physical (e.g. sea surface temperature) and biogeochemical patterns (nutrient and chlorophyll concentrations, as well as N2 fixation) in the tropical Pacific. This simulation displayed a Trichodesmium regional distribution that extends from 150°E to 120°W in the south tropical Pacific, and from 120°E to 140°W in the north tropical Pacific. The local simulated maximuma were found around islands (Hawaii, Fiji, Samoa, New Caledonia, Vanuatu). We assessed that 15% of the total primary production may be due to Trichodesmium in the low-nutrient low-chlorophyll regions (LNLC) of the tropical Pacific. Comparison between our explicit and the often used (in biogeochemical models) implicit parameterization of N2 fixation showed that the latter leads to an underestimation of N2 fixation rates by about 25% in LNLC regions. Finally, we established that iron fluxes from island sediments control the spatial distribution of Trichodesmium biomasses in the western tropical South Pacific. Note, this last result does not take into account the iron supply from rivers and hydrothermal sources, which may well be of importance in a region known for its strong precipitation rates and volcanic activity. 
PY 2018
PD JUN
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 15
IS 14
UT 000439155500001
BP 4333
EP 4352
DI 10.5194/bg-15-4333-2018
ID 53042
ER

EF