FN Archimer Export Format
PT J
TI Physical drivers of the nitrate seasonal variability in the Atlantic cold tongue
BT 
AF RADENAC, Marie-Helene
   JOUANNO, Julien
   TCHAMABI, Christine Carine
   AWO, Mesmin
   BOURLES, Bernard
   ARNAULT, Sabine
   AUMONT, Olivier
AS 1:1;2:1;3:1;4:1,2,3;5:4;6:5;7:5;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Univ Paul Sabatier, IRD, LEGOS, Observ Midi Pyrenees, F-31400 Toulouse, France.
   Univ Cape Town, Dept Oceanog, Nansen Tutu Ctr Marine Environm Res, Cape Town, South Africa.
   IRD, IRHOB, LHMC, Cotonou, Benin.
   IRD, US191 Instrumentat, Observ Geophys & Oceanog IMAGO, Technopole Pointe Diable,Moyens Analyt, Plouzane, France.
   Sorbonne Univ, MNHN, IRD, LOCEAN,CNRS, F-75005 Paris, France.
C2 UNIV TOULOUSE, FRANCE
   UNIV CAPE TOWN, SOUTH AFRICA
   IRD, BENIN
   IRD, FRANCE
   UNIV PARIS 06, FRANCE
IF 4.295
TC 13
UR https://archimer.ifremer.fr/doc/00623/73546/73808.pdf
   https://archimer.ifremer.fr/doc/00623/73546/73809.pdf
LA English
DT Article
CR EGEE/2
   PIRATA
BO Le Suroît
AB Ocean color observations show semiannual variations in chlorophyll in the Atlantic cold tongue with a main bloom in boreal summer and a secondary bloom in December. In this study, ocean color and in situ measurements and a coupled physical-biogeochemical model are used to investigate the processes that drive this variability. Results show that the main phytoplankton bloom in July-August is driven by a strong vertical supply of nitrate in May-July, and the secondary bloom in December is driven by a shorter and moderate supply in November. The upper ocean nitrate balance is analyzed and shows that vertical advection controls the nitrate input in the equatorial euphotic layer and that vertical diffusion and meridional advection are key in extending and shaping the bloom off Equator. Below the mixed layer, observations and modeling show that the Equatorial Undercurrent brings low-nitrate water (relative to off-equatorial surrounding waters) but still rich enough to enhance the cold tongue productivity. Our results also give insights into the influence of intraseasonal processes in these exchanges. The submonthly meridional advection significantly contributes to the nitrate decrease below the mixed layer. 
PY 2020
PD JAN
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 17
IS 2
UT 000512297400003
BP 529
EP 545
DI 10.5194/bg-17-529-2020
ID 73546
ER

EF