Seawater carbonate chemistry and dissolved organic matter dynamics during an oligotrophic ocean acidification experiment using large-scale mesocosms (KOSMOS 2014) ...

• Main Authors: Zark, Maren, Broda, Nadine, Hornick, Thomas, Grossart, Hans-Peter, Riebesell, Ulf, Dittmar, Thorsten
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Coast and continental shelf; Entire community; Field experiment; Mesocosm or benthocosm; North Atlantic; Other studied parameter or process; Pelagos; Temperate; Event label; Type of study; Day of experiment; Sample code/label; DATE/TIME; Carbon, organic, dissolved; Nitrogen, total dissolved; Carbon, inorganic, dissolved; Alkalinity, total; Salinity; Temperature, water; Carbonate system computation flag; pH; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Partial pressure of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Calcite saturation state; Mesocosm experiment; Calculated using seacarb after Nisumaa et al. 2010; KOSMOS_2014; Ocean Acidification International Coordination Centre OA-ICC; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.958964; https://doi.pangaea.de/10.1594/PANGAEA.958964

Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting changes in carbon storage capacity of the ocean, thus, may cause feedbacks on the global carbon cycle. Previous experiments studying OA effects on the DOM pool under natural conditions, however, were mostly conducted in temperate and coastal eutrophic areas. Here, we report on OA effects on the existing and newly produced DOM pool during an experiment in the subtropical North Atlantic Ocean at the Canary Islands during an (1) oligotrophic phase and (2) after simulated deep water upwelling. The last is a frequently occurring event in this region controlling nutrient and phytoplankton dynamics. We manipulated nine large-scale mesocosms with a gradient of pCO2 ranging from 350 up to 1,030 μatm and monitored the DOM ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2022) 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 2023-05-15. ...