Seawater carbonate chemistry and particulate organic particles during a semicontinuous batch culture experiment with Trichodesmium IMS101, 2007, supplement to: Barcelos e Ramos, Joana; Biswas, Haimanti; Schulz, Kai Georg; LaRoche, Julie; Riebesell, Ulf (2007): Effect of rising atmospheric carbon dioxide on the marine nitrogen fixer Trichodesmium. Global Biogeochemical Cycles, 21

• Main Authors: Barcelos e Ramos, Joana, Biswas, Haimanti, Schulz, Kai Georg, LaRoche, Julie, Riebesell, Ulf
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2007
• Subjects: Bacteria; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Cyanobacteria; Laboratory experiment; Not applicable; Other metabolic rates; Pelagos; Phytoplankton; Single species; Trichodesmium sp.; Experimental treatment; Salinity; Temperature, water; Carbonate system computation flag; pH; Alkalinity, total; Carbon, inorganic, dissolved; Carbon dioxide; Carbonate ion; Bicarbonate ion; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Aragonite saturation state; Calcite saturation state; Carbon, organic, particulate; Nitrogen, organic, particulate; Phosphorus, organic, particulate; Nitrogen fixation rate, per cell; Chlorophyll a per cell; Nitrogen per cell; Carbon per cell; Phosphate per cell; Trichodesmium cells; Calculated using seacarb after Nisumaa et al. 2010; Titration potentiometric, 794 Basic Titrino Metrohm; Automated segmented-flow analyzer Quaatro; Gas chromatography EURO EA Elemental Analyser, EUROVECTOR; Spectrophotometry; Determined by acetylene reduction assay using a gas chromatograph; Measured; Counting; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Ramos; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.716818; https://doi.pangaea.de/10.1594/PANGAEA.716818

Diazotrophic (N2-fixing) cyanobacteria provide the biological source of new nitrogen for large parts of the ocean. However, little is known about their sensitivity to global change. Here we show that the single most important nitrogen fixer in today's ocean, Trichodesmium, is strongly affected by changes in CO2 concentrations. Cell division rate doubled with rising CO2 (glacial to projected year 2100 levels) prompting lower carbon, nitrogen and phosphorus cellular contents, and reduced cell dimensions. N2 fixation rates per unit of phosphorus utilization as well as C:P and N:P ratios more than doubled at high CO2, with no change in C:N ratios. This could enhance the productivity of N-limited oligotrophic oceans, drive some of these areas into P limitation, and increase biological carbon sequestration in the ocean. The observed CO2 sensitivity of Trichodesmium could thereby provide a strong negative feedback to atmospheric CO2 increase. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) 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).