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| Wong, Gtf; Pai, Sc; Chung, Sw. |
| The distribution of cobalt was determined at one station in the oligotrophic western Philippine Sea that is far removed from the direct influence of any major land mass. Concentrations of cobalt (> 95 pM) in the top 150 m of water in and above the thermocline were much higher than those (about 25 pM) in the deep waters below 1000 m. Since no major river drained directly into the study area, these elevated concentrations in the surface waters could not have been sustained by a riverine input. A more likely source of cobalt to these waters might have been atmospheric deposition. Below 150 m, as a first approximation, the relationship between cobalt and salinity mimicked that between potential temperature and salinity with inflection points occurring at... |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00097/20858/18476.pdf |
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| Wong, Gtf; Dunstan, Wm; Kim, Db. |
| All nine species of marine phytoplankton tested (a cyanobacterium: Synechococcus sp., three diatoms: Chaetoceros simplex, Thalassiosira oceanica and Skeletonema costatum, two prymnesiophytes: Pleurochrysis carterae and Isochrysis galbana, a prasinophyte: Tetraselmis sp., a green alga: Dunaliella tertiolecta, and a dinoflagellate: Amphidinium carterae) were able to decompose hydrogen peroxide in the dark. Since these phytoplankton species can be found widely in a variety of marine sub-environments, this indicates that the dark decomposition of hydrogen peroxide by phytoplankton is a general phenomenon in the oceans. The decomposition rates were first order with respect to the concentration of hydrogen peroxide and biomass. The second-order rate constants... |
| Tipo: Text |
Palavras-chave: Phytoplancton marin; Peroxyde d'hydrogène; Oxydo-réduction; Marine phytoplankton; Hydrogen peroxide; Oxidation-reduction. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00322/43276/43007.pdf |
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| Wei, Cl; Wong, Gtf; Sun, Sj; Gong, Gc. |
| The distribution of extractable manganese, which is likely to be similar to dissolved manganese, in a transect from the mid-shelf of the southeastern East China Sea Shelf across the Kuroshio to the Okinawa Trough was determined in May 1991. In the surface layer above 200 m, the higher concentrations of extractable manganese (5 to 6 nM) are found at the most shoreward station. Mixing between the shelf water and the Kuroshio results in a tongue of manganese-rich water (> 3 nM) extending from the shelf into the Okinawa Trough. In contrast, the Kuroshio surface water and the upwelling Kuroshio subsurface water, both with concentrations of < 3 nM, are manganese-poor. Thus, during upwelling and frontal exchanges, manganese-poor water is imported into the... |
| Tipo: Text |
Palavras-chave: Mer de Chine Orientale; Manganèse; Kurioshio; East China Sea; Manganese; Kuroshio. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00292/40272/38640.pdf |
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