Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011gecoa..75.5283d&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 75, Issue 18, p. 5283-5295.
Other
Scientific paper
We report here the silicon isotopic composition (δ 30 Si) of dissolved silicon (DSi) from 42 surface water samples from the Drake Passage, the Weddell Gyre, other areas south of the Southern Boundary of the Antarctic Circumpolar Current (ACC), and the ACC near the Kerguelen Plateau, taken between the beginning of February and the end of March 2007. From the beginning to end of the cruise (ANTXXIII/9), DSi diminished in the Antarctic by 50 μmol L -1 while concentrations of nitrate + nitrite and phosphate showed no net decline, indicating that the high seasonal Si/N removal ratios well known for the Southern Ocean may be more related to the strength of the silicate pump in the Southern Ocean than to the instantaneous Si/N uptake ratio of diatoms. The δ 30 Si of DSi in samples containing more than 20 μM DSi were strongly negatively correlated to DSi concentrations, supporting the use of δ 30 Si as a proxy for DSi removal. The "open system" fractionation observed, &z.epsiv; = -1.2 ± 0.11‰, agrees well with results from previous work in other areas, and the estimate of the initial δ 30 Si of DSi of +1.4‰ is not far off observations of the δ 30 Si of DSi in Winter Water (WW) in this area. Results were used to model DSi draw down in the past from the δ 30 Si of sediment cores, although isotopic fractionation during silica dissolution appeared to influence the δ 30 Si of some surface water samples, inviting further study of this phenomenon.
Bescont Pierre
Croguennoc Alice
de La Rocha Christina L.
Ponzevera Emmanuel
No associations
LandOfFree
The silicon isotopic composition of surface waters in the Atlantic and Indian sectors of the Southern Ocean does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The silicon isotopic composition of surface waters in the Atlantic and Indian sectors of the Southern Ocean, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The silicon isotopic composition of surface waters in the Atlantic and Indian sectors of the Southern Ocean will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1400830