FN Archimer Export Format
PT J
TI Determination of the distribution of dissolved organic carbon in the Indian sector of the Southern Ocean
BT 
AF WIEBINGA, CJ
   DE BAAR, HJW
AS 1:1;2:1;
FF 1:;2:;
C1 Netherlands Inst Sea Res, NL-1790 AB Den Burg, Netherlands.
C2 INST SEA RESEARCH (NIOZ), NETHERLANDS
IF 1.798
TC 42
UR https://archimer.ifremer.fr/doc/00100/21113/18933.pdf
LA English
DT Article
CR ANTARES 2-MD78/ANTARFIX 4
BO Marion Dufresne
DE ;dissolved organic carbon (DOC);apparent oxygen utilization (AOU);bacterioplankton;mineralisation
AB During France JGOFS campaign ANTARES 2 (R.V. Marion Dufresne), samples were taken along a section of the 62 degrees E meridian from 49 degrees to 66 degrees S. The high temperature catalytic oxidation (HTCO) method was used to determine the concentration of dissolved organic carbon (DOC). The analyses were conducted both on-board ship and after the cruise in the laboratory. Collecting and storing acidified samples for post-cruise analysis induced no significant differences. The use of two separate but identical channels on the carbon analyzer increased the number of samples analysed per day and allowed independent monitoring of the instrument blank and the calibration of the detector response. The mixed layer concentrations of organic carbon varied from about 52 mu M C in the Antarctic Divergence (64 degrees S) to about 63 mu M C in the Polar Frontal Zone (49 degrees S). Vertical profiles showed a slight, but significant, decrease in organic carbon below the mixed layer, to about 42 mu M C below 2000 m across the transect. The homogeneity and low concentration of organic carbon in deep water is consistent with values recently reported for the equatorial Atlantic and Pacific Ocean and supports the evidence for a constant deep water DOC concentration. In addition, this provides a verification of the instrument performance, thus validating observed DOC data trends and allowing a comparison with the 'modern' DOC literature. In general, the organic carbon concentration in the mixed layer was lower than previously published data of the main ocean basins, which might -reflect the low chlorophyll a concentration (< 0.5 mu g/l) encountered in this region. Along the 62 degrees E meridian section, organic carbon showed a trend with corresponding measurements of phytoplankton biomass and bacterial production, underlining the dependence of bacterial growth on a pool of 'freshly' produced DOG. Organic carbon was found to exhibit a weak inverse trend versus apparent oxygen utilization (AOU). This suggests that only a small part of the oxygen consumption is due to the mineralisation of DOG. (C) 1998 Elsevier Science B.V. All rights reserved.
PY 1998
PD AUG
SO Marine Chemistry
SN 0304-4203
PU Elsevier Science Bv
VL 61
IS 3-4
UT 000074361800007
BP 185
EP 201
DI 10.1016/S0304-4203(98)00014-0
ID 21113
ER

EF