FN Archimer Export Format
PT J
TI Open-ocean convection process: A driver of the winter nutrient supply and the spring phytoplankton distribution in the Northwestern Mediterranean Sea
BT 
AF SEVERIN, Tatiana
   KESSOURI, Faycal
   REMBAUVILLE, Mathieu
   SANCHEZ-PEREZ, Elvia Denisse
   ORIOL, Louise
   CAPARROS, Jocelyne
   PUJO-PAY, Mireille
   GHIGLIONE, Jean-Francois
   D'ORTENZIO, Fabrizio
   TAILLANDIER, Vincent
   MAYOT, Nicolas
   DE MADRON, Xavier Durrieu
   ULSES, Caroline
   ESTOURNEL, Claude
   CONAN, Pascal
AS 1:1,2;2:3,4;3:1;4:1;5:1;6:1;7:1;8:1;9:5;10:5;11:5;12:6;13:3;14:3;15:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;
C1 UPMC Univ Paris 06, Sorbonne Univ, CNRS, Lab Oceanog Microbienne LOMIC,Observ Oceanol, Banyuls Sur Mer, France.
   Univ Texas Austin, Marine Sci Inst, Port Aransas, TX USA.
   Univ Toulouse, CNRS, Lab Aerol, Toulouse, France.
   Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Math Sci, Los Angeles, CA USA.
   UPMC Univ Paris 06, Sorbonne Univ, INSU CNRS, LOV, Villefranche Sur Mer, France.
   Univ Perpignan, CNRS, CEFREM, Perpignan, France.
C2 UNIV PARIS 06, FRANCE
   UNIV TEXAS AUSTIN, USA
   UNIV TOULOUSE, FRANCE
   UNIV CALIF LOS ANGELES, USA
   UNIV PARIS 06, FRANCE
   UNIV PERPIGNAN, FRANCE
IF 2.711
TC 16
UR https://archimer.ifremer.fr/doc/00466/57754/60026.pdf
   https://archimer.ifremer.fr/doc/00466/57754/60027.pdf
LA English
DT Article
CR DEWEX-MERMEX 2013 LEG1
   DEWEX-MERMEX 2013 LEG2
   MOOSE-GE
BO Le Suroît
AB This study was a part of the DeWEX project (Deep Water formation Experiment), designed to better understand the impact of dense water formation on the marine biogeochemical cycles. Here, nutrient and phytoplankton vertical and horizontal distributions were investigated during a deep open-ocean convection event and during the following spring bloom in the Northwestern Mediterranean Sea (NWM). In February 2013, the deep convection event established a surface nutrient gradient from the center of the deep convection patch to the surrounding mixed and stratified areas. In the center of the convection area, a slight but significant difference of nitrate, phosphate and silicate concentrations was observed possibly due to the different volume of deep waters included in the mixing or to the sediment resuspension occurring where the mixing reached the bottom. One of this process, or a combination of both, enriched the water column in silicate and phosphate, and altered significantly the stoichiometry in the center of the deep convection area. This alteration favored the local development of microphytoplankton in spring, while nanophytoplankton dominated neighboring locations where the convection reached the deep layer but not the bottom. This study shows that the convection process influences both winter nutrients distribution and spring phytoplankton distribution and community structure. Modifications of the convection's spatial scale and intensity (i.e., convective mixing depth) are likely to have strong consequences on phytoplankton community structure and distribution in the NWM, and thus on the marine food web. Plain Language Summary The deep open-ocean convection in the Northwestern Mediterranean Sea is an important process for the formation and the circulation of the deep waters of the entire Mediterranean Sea, but also for the local spring phytoplankton bloom. In this study, we showed that variations of the convective mixing depth induced different supply in nitrate, phosphate and silicate, and thus different nutrients ratios in the surface waters. These variations could be the result of pore water release loaded in nutrients because of the sediment resuspension enhanced by the bottom-reached mixing. Because of this phenomenon, the slightly higher silicate concentrations in the center of the convection area favored diatoms development in spring. Modifications of this process because of the climate change could then have some consequences on the phytoplankton community structure and thus on the entire marine food web. 
PY 2017
PD JUL
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU Amer Geophysical Union
VL 122
IS 6
UT 000407088800007
BP 4587
EP 4601
DI 10.1002/2016JC012664
ID 57754
ER

EF