FN Archimer Export Format
PT J
TI Nitrogen fixation in the eastern Atlantic reaches similar levels in the Southern and Northern Hemisphere
BT 
AF FONSECA-BATISTA, Debany
   DEHAIRS, Frank
   RIOU, Virginie
   FRIPIAT, Francois
   ELSKENS, Marc
   DEMAN, Florian
   BRION, Natacha
   QUEROUE, Fabien
   BODE, Maya
   AUEL, Holger
AS 1:1;2:1;3:2;4:1,3;5:1;6:1;7:1;8:4;9:5;10:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Vrije Univ Brussel, Earth Syst Sci Res Grp, Analyt Environm & Geochem, Brussels, Belgium.
   Univ Toulon & Var, Aix Marseille Univ, CNR, INSU,IRD,MIO,UM 110, F-13288 Marseille, France.
   Max Planck Inst Chem, Mainz, Germany.
   IFREMER, LEMAR, CNRS, UMR 6539,UBO,IRD, Plouzane, France.
   Univ Bremen, Bremen Marine Ecol, Marine Zool, Bremen, Germany.
C2 UNIV VRIJE BRUSSEL, BELGIUM
   UNIV TOULON, FRANCE
   MAX PLANCK INST CHEM, GERMANY
   CNRS, FRANCE
   UNIV BREMEN, GERMANY
UM LEMAR
IF 2.711
TC 17
UR https://archimer.ifremer.fr/doc/00379/49009/49451.pdf
   https://archimer.ifremer.fr/doc/00379/49009/49452.pdf
   https://archimer.ifremer.fr/doc/00379/49009/49453.xlsx
   https://archimer.ifremer.fr/doc/00379/49009/49454.xlsx
LA English
DT Article
DE ;nitrogen fixation;Atlantic Ocean;primary production
AB Euphotic layer dinitrogen (N-2) fixation and primary production (PP) were measured in the eastern Atlantic Ocean (38 degrees N-21 degrees S) using N-15(2) and C-13 bicarbonate tracer incubations. This region is influenced by Saharan dust deposition and waters with low nitrogen to phosphorus (N/P) ratios originating from the Subantarctic and the Benguela upwelling system. Depth-integrated rates of N-2 fixation in the north (0 degrees N-38 degrees N) ranged from 59 to 370 mu mol N m(-2) d(-1), with the maximal value at 19 degrees N under the influence of the northwest African upwelling. Diazotrophic activity in the south (0 degrees S-21 degrees S), though slightly lower, was surprisingly close to observations in the north, with values ranging from 47 to 119 mu mol N m(-2) d(-1). Our North Atlantic N-2 fixation rates correlate well with dust deposition, while those in the South Atlantic correlate strongly with excess phosphate relative to nitrate. There, the necessary iron is assumed to be supplied from the Benguela upwelling system. When converting N-2 fixation to carbon uptake using a Redfield ratio (6.6), we find that N-2 fixation may support up to 9% of PP in the subtropical North Atlantic (20 degrees N-38 degrees N), 5% in the tropical North Atlantic (0 degrees N-20 degrees N), and 1% of PP in the South Atlantic (0 degrees S-21 degrees S). Combining our data with published data sets, we estimate an annual N input of 27.610 Tg N yr(-1) over the open Atlantic Ocean, 11% of which enters the region between 20 degrees N and 50 degrees N, 71% between 20 degrees N and 10 degrees S, and 18% between 10 degrees N and 45 degrees S. 
PY 2017
PD JAN
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU Amer Geophysical Union
VL 122
IS 1
UT 000394996400035
BP 587
EP 601
DI 10.1002/2016JC012335
ID 49009
ER

EF