Effect of enhanced pCO2 levels on the production of dissolved organic carbon and transparent exopolymer particles in short-term bioassay experiments ...

• Main Authors: MacGilchrist, G A, Shi, T, Tyrrell, Toby, Richier, Sophie, Moore, C M, Dumousseaud, Cynthia, Achterberg, Eric Pieter
• Format: Dataset
• Language: English
• Published: PANGAEA 2014
• Subjects: Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Coast and continental shelf; Entire community; Laboratory experiment; North Atlantic; Open ocean; Pelagos; Phytoplankton; Temperate; Event label; Identification; Treatment; Temperature, water; Salinity; Time in hours; Carbon, inorganic, dissolved; Alkalinity, total; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Calcite saturation state; Aragonite saturation state; Nitrate; Flag; Silicate; Phosphate; Chlorophyll a; Transparent exopolymer particles as Gum Xanthan equivalents per volume; Carbon, organic, dissolved; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Experiment; Coulometric titration; Potentiometric titration; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; United Kingdom Ocean Acidification research programme UKOA; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.837464; https://doi.pangaea.de/10.1594/PANGAEA.837464

It has been proposed that increasing levels of pCO2 in the surface ocean will lead to more partitioning of the organic carbon fixed by marine primary production into the dissolved rather than the particulate fraction. This process may result in enhanced accumulation of dissolved organic carbon (DOC) in the surface ocean and/or concurrent accumulation of transparent exopolymer particles (TEPs), with important implications for the functioning of the marine carbon cycle. We investigated this in shipboard bioassay experiments that considered the effect of four different pCO2 scenarios (ambient, 550, 750 and 1000 µatm) on unamended natural phytoplankton communities from a range of locations in the northwest European shelf seas. The environmental settings, in terms of nutrient availability, phytoplankton community structure and growth conditions, varied considerably between locations. We did not observe any strong or consistent effect of pCO2 on DOC production. There was a significant but highly variable effect of ... : 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 2014-10-28. ...