Seawater carbonate chemistry, processes and elements during experiments with planktonic foraminifera Orbulina universa, 2004, supplement to: Russell, Ann D; Hönish, Bärbel; Spero, Howard J; Lea, David W (2004): Effects of seawater carbonate ion concentration and temperature on shell U, Mg, and Sr in cultured planktonic foraminifera. Geochimica et Cosmochimica Acta, 68(21), 4347-4361

• Main Authors: Russell, Ann D, Hönish, Bärbel, Spero, Howard J, Lea, David W
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2004
• Subjects: Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Calcification/Dissolution; Chromista; Foraminifera; Growth/Morphology; Heterotrophic prokaryotes; Laboratory experiment; Not applicable; Open ocean; Orbulina universa; Pelagos; Single species; Temperate; Sample ID; Species; Radiation, photosynthetically active; Carbonate system computation flag; Salinity; Temperature, water; 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; Carbon, inorganic, dissolved; Alkalinity, total; Aragonite saturation state; Calcite saturation state; Calcite, dissolved; Foraminifera, planktic, size average; Foraminifera, planktic, mass per shell; Foraminifera, planktic, wall thickness; Magnesium/Calcium ratio; Strontium/Calcium ratio; Uranium/Calcium ratio; Experiment; Calculated using seacarb after Nisumaa et al. 2010; Coulometric titration; Potentiometric open-cell titration; Measured; European network of excellence for Ocean Ecosystems Analysis EUR-OCEANS; European Project on Ocean Acidification EPOCA; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.721890; https://doi.pangaea.de/10.1594/PANGAEA.721890

We investigate the sensitivity of U/Ca, Mg/Ca, and Sr/Ca to changes in seawater [CO3[2-]] and temperature in calcite produced by the two planktonic foraminifera species, Orbulina universa and Globigerina bulloides, in laboratory culture experiments. Our results demonstrate that at constant temperature, U/Ca in O. universa decreases by 25 +/- 7% per 100 µmol [CO3[2-]] kg**-1, as seawater [CO3[2-]] increases from 110 to 470 µmol kg**-1. Results from G. bulloides suggest a similar relationship, but U/Ca is consistently offset by ~+40% at the same environmental [CO3[2-]]. In O. universa, U/Ca is insensitive to temperature between 15°C and 25°C. Applying the O. universa relationship to three U/Ca records from a related species, Globigerinoides sacculifer, we estimate that Caribbean and tropical Atlantic [CO3[2-]] was 110 +/- 70 µmol kg**-1 and 80 +/- 40 µmol kg**-1 higher, respectively, during the last glacial period relative to the Holocene. This result is consistent with estimates of the glacial-interglacial change in surface water [CO3[2-]] based on both modeling and on boron isotope pH estimates. In settings where the addition of U by diagenetic processes is not a factor, down-core records of foraminiferal U/Ca have potential to provide information about changes in the ocean's carbonate concentration. : 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).