FN Archimer Export Format
PT J
TI Labile Fe(II) concentrations in the Atlantic sector of the Southern Ocean along a transect from the subtropical domain to the Weddell Sea Gyre
BT 
AF SARTHOU, G.
   BUCCIARELLI, Eva
   CHEVER, Fanny
   HANSARD, S. P.
   GONZALEZ-DAVILA, M.
   SANTANA-CASIANO, J. M.
   PLANCHON, F.
   SPEICH, Sabrina
AS 1:1,2;2:1,2;3:1,2;4:3;5:4;6:4;7:1,2;8:1,5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Univ Europeenne Bretagne, Brest, France.
   IUEM,Univ Brest, CNRS, IRD, LEMAR UMR6539, F-29280 Plouzane, France.
   Florida Geol Survey, Tallahassee, FL 32301 USA.
   Univ Las Palmas Gran Canaria, Dept Quim, Fac Ciencias Mar, Las Palmas Gran Canaria 35017, Spain.
   Univ Brest, CNRS, IRD,IFREMER, IUEM,LPO UMR6523, F-29238 Brest, France.
C2 UBO, FRANCE
   UBO, FRANCE
   FLORIDA GEOL SURVEY, USA
   UNIV LAS PALMAS GRAN CANARIA, SPAIN
   UBO, FRANCE
IN DOAJ
IF 3.859
TC 28
TU Centre national de la recherche scientifique
   Institut de recherche pour le développement
   Institut français de recherche pour l'exploitation de la mer
   Service Hydrographique et Océanographique de la Marine
   Université de Bretagne Occidentale
   Université de Bretagne-Sud
UR https://archimer.ifremer.fr/doc/00048/15918/13345.pdf
LA English
DT Article
CR MD 166 / BONUS-GOODHOPE
BO Marion Dufresne
AB Labile Fe(II) distributions were investigated in the Sub-Tropical South Atlantic and the Southern Ocean during the BONUS-GoodHope cruise from 34 to 57 degrees S (February-March 2008). Concentrations ranged from below the detection limit (0.009 nM) to values as high as 0.125 nM. In the surface mixed layer, labile Fe(II) concentrations were always higher than the detection limit, with values higher than 0.060nM south of 47 degrees S, representing between 39% and 63% of dissolved Fe (DFe). Apparent biological production of Fe(II) was evidenced. At intermediate depth, local maxima were observed, with the highest values in the Sub-Tropical domain at around 200 m, and represented more than 70% of DFe. Remineralization processes were likely responsible for those sub-surface maxima. Below 1500 m, concentrations were close to or below the detection limit, except at two stations (at the vicinity of the Agulhas ridge and in the north of the Weddell Sea Gyre) where values remained as high as similar to 0.030-0.050 nM. Hydrothermal or sediment inputs may provide Fe(II) to these deep waters. Fe(II) half life times (t(1/2)) at 4 degrees C were measured in the upper and deep waters and ranged from 2.9 to 11.3 min, and from 10.0 to 72.3 min, respectively. Measured values compared quite well in the upper waters with theoretical values from two published models, but not in the deep waters. This may be due to the lack of knowledge for some parameters in the models and/or to organic complexation of Fe(II) that impact its oxidation rates. This study helped to considerably increase the Fe(II) data set in the Ocean and to better understand the Fe redox cycle.
PY 2011
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 8
IS 9
UT 000295375700004
BP 2461
EP 2479
DI 10.5194/bg-8-2461-2011
ID 15918
ER

EF