FN Archimer Export Format
PT J
TI Diapycnal oxygen supply to the tropical North Atlantic oxygen minimum zone
BT 
AF FISCHER, T.
   BANYTE, D.
   BRANDT, P.
   DENGLER, M.
   KRAHMANN, G.
   TANHUA, T.
   VISBECK, Martin
AS 1:1;2:1;3:1;4:1;5:1;6:1;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 GEOMAR, Helmholtz Ctr Ocean Res, Kiel, Germany
C2 GEOMAR, GERMANY
IF 3.753
TC 30
UR https://archimer.ifremer.fr/doc/00129/24029/21985.pdf
   https://archimer.ifremer.fr/doc/00129/24029/93141.pdf
LA English
DT Article
CR GEOMAR4
BO L'Atalante
AB The replenishment of consumed oxygen in the open ocean oxygen minimum zone (OMZ) off West Africa in the tropical North Atlantic Ocean is studied, with a focus on oxygen transport across density surfaces (diapycnal flux). The latter is obtained from a large observational set of oxygen profiles and diapycnal mixing data from years 2008 to 2010. Diapycnal mixing is inferred from different sources: a large scale tracer release experiment, microstructure profiles, and shipboard acoustic current measurements plus density profiles. The average diapycnal diffusivity in the study area is 1 × 10−5 m2 s−1. No significant vertical gradient of average diapycnal diffusivities exists in the depth interval from 150 to 500 m. The diapycnal flux is found to contribute substantially to the oxygen supply of the OMZ. Within the OMZ core, 1.5 µmol kg−1 a−1 of oxygen is supplied via diapycnal mixing, contributing about a third of the total demand. The oxygen that is contributed via diapycnal mixing originates from oxygen that has been laterally supplied within the overlying Central Water layer by advective and eddy fluxes. Due to the existence of a separate shallow oxygen minimum at about 100 m depth throughout most of the study area, there is no direct net vertical oxygen flux from the surface layer of the study area into the Central Water layer. Thus all oxygen supply of the OMZ is associated with remote pathways.
PY 2013
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 10
IS 7
UT 000324617300001
BP 5079
EP 5093
DI 10.5194/bg-10-5079-2013
ID 24029
ER

EF