Coccolitophore calcification is independent of carbonate chemistry in the tropical ocean
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AuthorsMarañón, , E. (Emilio); Balch, , W.M. (William M.); Cermeño, P. (Pedro); González, N. (Natalia); Sobrino, C. (Cristina); Fernández, A. (Ana); Huete-Ortega, M. (María); López-Sandoval, D. C. (Daffine C.); Delgado, M. (Maximino); Estrada, M. (Marta); Álvarez, M. (Marta); Fernández-Guallart, E. (Elisa); Pelejero, C. (Carles)
tropical oceanic areas
Short-term experiments indicate that seawater acidification can cause a decrease in the rate of calcification by coccolithopores, but the relationship between carbonate chemistry and coccolithophore calcification rate in natural assemblages is still unclear. During the Malaspina 2010 circumnavigation, we measured primary production, calcificatiion, coccolithophore abundance, particulate inorganic carbon (PIC) concentration, and the parameters of the carbonate system, along basin-scale transects in the tropical Atlantic, Indian and Pacific oceans. Euphotic layer-integrated calcification and mean cell-specific calcification to primary production (CP/PP) ratio was relatively invariant among ocean basins, with an overall mean value of 0.05+-0.04. Extrapoling this value to the entire ocean would result in a global pelagic calcification rate of 2.4 PtC /year. The mean PIC concentration in surface waters was 1.8 +-1.6 mgC/m3 and its turnover time averaged 20 d. We combined our data of calcif ...
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