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Environmental controls on the Emiliania huxleyi calcite mass ArchiMer
Horigome, M. T.; Ziveri, P.; Grelaud, M.; Baumann, K. -h.; Marino, G.; Mortyn, P. G..
Although ocean acidification is expected to impact (bio) calcification by decreasing the seawater carbonate ion concentration, [CO32-], there is evidence of nonuniform response of marine calcifying plankton to low seawater [CO32-]. This raises questions about the role of environmental factors other than acidification and about the complex physiological responses behind calcification. Here we investigate the synergistic effect of multiple environmental parameters, including seawater temperature, nutrient (nitrate and phosphate) availability, and carbonate chemistry on the coccolith calcite mass of the cosmopolitan coccolithophore Emiliania huxleyi, the most abundant species in the world ocean. We use a suite of surface (late Holocene) sediment samples from...
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Ano: 2014 URL: https://archimer.ifremer.fr/doc/00274/38486/36954.pdf
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Planktic foraminifer and coccolith contribution to carbonate export fluxes over the central Kerguelen Plateau ArchiMer
Rembauville, M.; Meilland, J.; Ziveri, P.; Schiebel, R.; Blain, S.; Salter, I..
We report the contribution of planktic foraminifers and coccoliths to the particulate inorganic carbon (PIC) export fluxes collected over an annual cycle (October 2011/September 2012) on the central Kerguelen Plateau in the Antarctic Zone (AAZ) south of the Polar Front (PF). The seasonality of PIC flux was decoupled from surface chlorophyll a concentration and particulate organic carbon (POC) fluxes and was characterized by a late summer (February) maximum. This peak was concomitant with the highest satellite-derived sea surface PIC and corresponded to a Emiliania huxleyi coccoliths export event that accounted for 85% of the annual PIC export. The foraminifer contribution to the annual PIC flux was much lower (15%) and dominated by Turborotalita...
Tipo: Text Palavras-chave: Foraminifer; Coccoliths; Export; Carbonate counter-pump; Kerguelen Plateau; Southern Ocean.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00421/53249/54722.pdf
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