Seawater carbonate chemistry and coccolith calcite mass of Emiliania huxleyi ...

• Main Authors: D'Amario, Barbara, Ziveri, Patrizia, Grelaud, Michaël, Oviedo, Angela Maria
• Format: Dataset
• Language: English
• Published: PANGAEA 2018
• Subjects: Chromista; Coast and continental shelf; Emiliania huxleyi; Field observation; Growth/Morphology; Haptophyta; Mediterranean Sea; Pelagos; Phytoplankton; Single species; Temperate; Event label; Type; Species; Registration number of species; Uniform resource locator/link to reference; LATITUDE; LONGITUDE; ELEVATION; Station label; Bottle number; DATE/TIME; DEPTH, water; Pressure, water; Temperature, water; Salinity; Nitrate and Nitrite; Phosphate; Oxygen; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Carbonate ion; Alkalinity, total; Radiation, photosynthetically active; Fluorescence, chlorophyll; Percentage; Coccoliths, mass; Coccoliths, length; Calcification index; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbon, inorganic, dissolved; Aragonite saturation state; Calcite saturation state; CTD/Rosette; CTD; Nutrient autoanalyzer Bran and Luebbe, AAIII; Oxygen sensor, SBE 43; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.914922; https://doi.pangaea.de/10.1594/PANGAEA.914922

To understand the response of marine calcifying organisms under high CO2 scenarios, it is critical to study their calcification patterns in the natural environment. This paper focuses on a major calcifying phytoplankton group, the coccolithophores, through the analysis of water samples collected along a W-E Mediterranean transect during two research cruises, in April 2011 (Meteor cruise M84/3) and May 2013 (MedSeA cruise 2013). The Mediterranean Sea is a marginal sea characterized by large biogeochemical gradients. Currently, it is undergoing both warming and ocean acidification, processes which are rapidly modifying species distribution and calcification. The species Emiliania huxleyi largely dominates the total coccolithophore production in present day oceans and marine basins, including the Mediterranean Sea. A series of morphometric measurements were performed on the coccoliths of this species to estimate their mass, length and calculate a calcification index (proxy for the size-normalized calcification ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2019) 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 by seacarb is 2020-04-16.Coccolith mass: for each sample, mass measurements were done with SYRACO (Beaufort and Dollfus, 2004; doi:10.1016/j.marmicro.2003.09.003) on at least 100 - 300 coccoliths and then averagedCoccolith length: for each sample, length measurements were done with SYRACO (Beaufort and Dollfus, 2004; doi:10.1016/j.marmicro.2003.09.003) on at least 100 - 300 coccoliths and then averagedCoccolith, corrected length: averaged coccolith lengths obtained from SYRACO where converted into Lc using the formula: Lc = (0.585 x coccolith length from SYRACO) + 0.4537Calcification index: Ci=Ms/Mn); Mn=coccolith ...