Predominance of heavily calcified coccolithophores at low CaCO3 saturation during winter in the Bay of Biscay ...

• Main Authors: Smith, Helen Elizabeth Katie, Tyrrell, Toby, Charalampopoulou, Anastasia, Dumousseaud, Cynthia, Legge, Oliver J, Birchenough, Sarah, Pettit, Laura Rachel, Garley, Rebecca, Hartman, Sue E, Hartman, Mark C, Sagoo, Navjit, Daniels, Chris J, Achterberg, Eric Pieter, Hydes, D J
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Biomass/Abundance/Elemental composition; Chromista; Coast and continental shelf; Emiliania huxleyi; Field observation; Growth/Morphology; Haptophyta; North Atlantic; Open ocean; Pelagos; Phytoplankton; Single species; Temperate; Species; DATE/TIME; LATITUDE; LONGITUDE; Number of measurements; Volume; Cell density; Cell density, standard error; Confidence interval; Coccoliths, overcalcified; Silicate; Phosphate; Carbon, inorganic, dissolved; Alkalinity, total; Temperature, water; Salinity; Carbonate system computation flag; pH; Carbon dioxide; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Counting; Coulometric titration; Potentiometric titration; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.833061; https://doi.pangaea.de/10.1594/PANGAEA.833061

Coccolithophores are an important component of the Earth system, and, as calcifiers, their possible susceptibility to ocean acidification is of major concern. Laboratory studies at enhanced pCO2 levels have produced divergent results without overall consensus. However, it has been predicted from these studies that, although calcification may not be depressed in all species, acidification will produce "a transition in dominance from more to less heavily calcified coccolithophores" [Ridgwell A, et al., (2009) Biogeosciences 6:2611-2623]. A recent observational study [Beaufort L, et al., (2011) Nature 476:80-83] also suggested that coccolithophores are less calcified in more acidic conditions. We present the results of a large observational study of coccolithophore morphology in the Bay of Biscay. Samples were collected once a month for over a year, along a 1,000-km-long transect. Our data clearly show that there is a pronounced seasonality in the morphotypes of Emiliania huxleyi, the most abundant ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2014-05-28. ...