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| Hoppema, M.; Dehairs, F.; Navez, J.; Monnin, C.; Jeandel, C.; Fahrbach, E.; De Baar, H. J. W.. |
| The Southern Ocean data base of dissolved barium (Bad) has been augmented with two densely sampled sections across the Weddell Gyre sampled by the icebreaker FS Polarstern during February and March 2005. Bad was found to be relatively high in the surface layer as compared to the adjacent waters north (Antarctic Circumpolar Current) and east (Antarctic Zone of the Indian sector). Compared to the inflowing water into the Weddell Gyre and also to the surface water, the deep water is characterized by a significant Ba-d enrichment. Depletion of Bad in the surface layer is associated with well-known biogeochemical processes, but we speculate that also sea-ice formation leads to the extraction of Ba from solution via barite (BaSO4) precipitation. The particulate... |
| Tipo: Text |
Palavras-chave: Barium Silicate Geochemical cycle Southern Ocean; Weddell Sea. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00460/57178/59134.pdf |
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| Monnin, C.; Chavagnac, V.; Boulart, C.; Menez, B.; Gerard, M.; Gerard, E.; Pisapia, C.; Quemeneur, M.; Erauso, G.; Postec, A.; Guentas-dombrowski, L.; Payri, C.; Pelletier, B.. |
| The terrestrial hyperalkaline springs of Prony Bay (southern lagoon, New Caledonia) have been known since the nineteenth century, but a recent high-resolution bathymetric survey of the seafloor has revealed the existence of numerous submarine structures similar to the well-known Aiguille de Prony, which are also the location of high-pH fluid discharge into the lagoon. During the HYDROPRONY cruise (28 October to 13 November 2011), samples of waters, gases and concretions were collected by scuba divers at underwater vents. Four of these sampling sites are located in Prony Bay at depths up to 50 m. One (Bain des Japonais spring) is also in Prony Bay but uncovered at low tide and another (Rivière des Kaoris spring) is on land slightly above the seawater level... |
| Tipo: Text |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00240/35142/33656.pdf |
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| Monnin, C.; Jeandel, C.; Cattaldo, T.; Dehairs, F.A.. |
| This paper addresses the question of the eventual control of barium concentration in seawater by an equilibrium with barite. For this, we have used a new thermodynamic model to compute the barite saturation index of ocean waters, mainly from GEOSECS data. Our results show that equilibrium between barite and seawater is reached in a number of places: cold surface waters of the Southern Ocean, waters at intermediate depths (2000-3500 m) in the Pacific, deep waters (2000-3500 m) of the Gulf of Bengal. The only samples for which a slight barite supersaturation is found are the surface waters at GEOSECS station G89 in the Weddell Gyre. Besides these locations, the rest of the world's oceans is undersaturated, as was established by Church and Wolgemuth [Church,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aqueous solutions; Oceanography; Oceans; Saturation; Thermodynamics. |
| Ano: 1999 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=10260 |
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