FN Archimer Export Format
PT J
TI Distributions and stoichiometry of dissolved nitrogen and phosphorus in the iron-fertilized region near Kerguelen (Southern Ocean)
BT 
AF BLAIN, S.
   CAPPAROS, J.
   GUENEUGUES, A.
   OBERNOSTERER, I.
   ORIOL, L.
AS 1:1,2;2:1,2;3:1,2;4:1,2;5:1,2;
FF 1:;2:;3:;4:;5:;
C1 Univ Paris 06, Sorbonne Univ, Lab Oceanog Microbienne, Observ Oceanol,UMR7621, F-66650 Banyuls Sur Mer, France.
   CNRS, UMR7621, Lab Oceanog Microbienne, Observ Oceanol, F-66650 Banyuls Sur Mer, France.
C2 UNIV PARIS 06, FRANCE
   CNRS, FRANCE
IN DOAJ
IF 3.7
TC 30
UR https://archimer.ifremer.fr/doc/00292/40343/38883.pdf
   https://archimer.ifremer.fr/doc/00292/40343/38884.pdf
   https://archimer.ifremer.fr/doc/00292/40343/71315.pdf
LA English
DT Article
CR ANTARES 3
   MD 188 / KEOPS 2
   OISO 8
   OISO1
   OISO2
   OISO3-NIVMER98
   OISO4 (VT 46)
   OISO5 (VT 49)
   VT 105 / OISO 17
   VT 108 / OISO-18
   VT 114 / OISO-19
   VT 117 / OISO-20
   VT 120 / OISO-21
   VT 125 / KEOPS2_MOOR
   VT 127 / OISO-22
   VT 136 / OISO-23
   VT 51 / OISO 6
   VT 57 / OISO 9
   VT 60 / CARAUS - OISO 10
   VT 62 / CARAUS - OISO 11
   VT 79 / OISO 12
   VT 80 / OISO 13
   VT 81 / OISO 14
   VT 85 / OISO 15
   VT 94 / OISO 16
BO Marion Dufresne
AB During KEOPS2 (Kerguelen Ocean and Plateau Compared Study 2), we determined dissolved inorganic and organic nitrogen and phosphorus species in the naturally fertilized region of Kerguelen Island (Southern Ocean). Above 150 m, stations were clearly separated by the polar front (PF), with concentrations of NO3-, NO2- and PO43- overall lower north of the PF than south. Though less pronounced, a similar trend was detectable for dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP). At all stations offshore and above the plateau, a subsurface maximum of NH4+ was observed between 50 and 150 m. We examined nutrient stoichiometry by calculating the linear combination N* = [NO3-]-16 [PO43-]. The majority of stations and depths revealed N* close to -3 mu M; however, for surface waters north of the PF, N* increased up to 6 mu M. This suggests a preferential uptake of PO43- versus NO3- by fast-growing diatoms. Using the tracer TNxs = [TDN]-16[TDP] (TDN, total dissolved nitrogen; TDP, total dissolved phosphorus) revealed that the dissolved organic fraction significantly contributed to changes in TNxs. TNxs values were negative for most stations and depths, and relatively constant in the 0-500m layer. As for N*, the stations north of the PF had higher TNxs in the 0-100m layer. We discuss this stoichiometric anomaly with respect to possible external sources and sinks of N and P. Additional data collected in February 2013 at two sites revealed the occurrence of a subsurface minimum of N* located just below the pycnocline, which denotes a layer where remineralization of particulate organic matter with low N: P ratio P, possibly associated with preferential remineralization of P versus N, persists throughout the season.
PY 2015
PD JAN
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 12
IS 2
UT 000348982200024
BP 623
EP 635
DI 10.5194/bg-12-623-2015
ID 40343
ER

EF