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| Trull, Tw; Bray, Sg; Manganini, Sj; Honjo, S; Francois, R. |
| Sediment trap moorings were deployed from September 21, 1997 through February 21, 1998 at three locations south of Australia along 140degreesE: at similar to47degreesS in the central Subantarctic Zone (SAZ) with traps at 1060, 2050, and 3850 m depth, at similar to51degreesS in the Subantarctic Front with one trap at 3080 m, and at similar to54degreesS in the Polar Frontal Zone (PFZ) with traps at 830 and 1580 m. Particle fluxes were high at all the sites (18-32 g m(-2) yr(-1) total mass and 0.5-1.4 g organic carbon m(-2) yr(-1) at similar to1000 m, assuming minimal flux outside the sampled summer period). These values are similar to other Southern Ocean results and to the median estimated for the global ocean by Lampitt and Antia [1997], and emphasize that... |
| Tipo: Text |
Palavras-chave: Carbon cycling; Global Change: Biogeochemical processes; Oceanography: Biological and Chemical: Biogeochemical cycles; Oceanography: General. |
| Ano: 2001 |
URL: https://archimer.ifremer.fr/doc/00221/33211/31697.pdf |
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| Cardinal, D; Alleman, Ly; Dehairs, F; Savoye, N; Trull, Tw; Andre, L. |
| We analyzed delta(29) Si of dissolved silicate for eight water column profiles across the Southern Ocean ( south of Australia in spring 2001) from the Seasonal Ice Zone (SIZ) north to the Subantarctic Zone (SAZ), including the first isotopic compositions measured for Si-depleted seawaters. All profiles display mixed layer enrichments in heavy Si isotopes relative to deep water in accordance with preferential uptake of the light isotope by diatoms. As silicate levels decrease from the SIZ northward across the Polar Front Zone (PFZ) to the SAZ, surface and mesopelagic delta(29) Si signatures generally become progressively heavier, but the most Si-depleted SAZ waters do not exhibit delta(29) Si values heavier than in the PFZ. This intricacy appears to derive... |
| Tipo: Text |
Palavras-chave: Δ29Si; Δ30Si; Diatoms; Spring Southern Ocean; Fractionation factor. |
| Ano: 2005 |
URL: https://archimer.ifremer.fr/doc/00233/34424/32838.pdf |
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