Seawater carbonate chemistry and coccolithophore abundances and CaCO3 concentrations during the 2013 MedSeA mesocosm experiment


Mesocosm experiments have been fundamental to investigate the effects of elevated CO2 and ocean acidification (OA) on planktic communities. However, few of these experiments have been conducted using naturally nutrient-limited waters and/or considering the combined effects of OA and ocean warming (OW). Coccolithophores are a group of calcifying phytoplankton that can reach high abundances in the Mediterranean Sea, and whose responses to OA are modulated by temperature and nutrients. We present the results of the first land-based mesocosm experiment testing the effects of combined OA and OW on an oligotrophic Eastern Mediterranean coccolithophore community. Coccolithophore cell abundance drastically decreased under OW and combined OA and OW (greenhouse, GH) conditions. Emiliania huxleyi calcite mass decreased consistently only in the GH treatment; moreover, anomalous calcifications (i.e. coccolith malformations) were particularly common in the perturbed treatments, especially under OA. Overall, these data suggest that the projected increase in sea surface temperatures, including marine heatwaves, will cause rapid changes in Eastern Mediterranean coccolithophore communities, and that these effects will be exacerbated by OA.

In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Gattuso et al, 2021) 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 2021-05-11.

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Creator D'Amario, Barbara ORCID logo; Pérez-Mejías, Carlos ORCID logo; Grelaud, Michaël ORCID logo; Paraskevi, Pitta; Krasakopoulou, Evangelia ORCID logo; Ziveri, Patrizia ORCID logo
Publisher PANGAEA
Contributor Pitta, Paraskevi; Frangoulis, Constantin; Tsapakis, Manolis; Yang, Yan
Publication Year 2020
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Resource Type Dataset
Format text/tab-separated-values
Size 4166 data points
Discipline Earth System Research
Spatial Coverage (25.282 LON, 35.331 LAT); Sea of Crete
Temporal Coverage Begin 2013-09-01T00:00:00Z
Temporal Coverage End 2013-09-12T00:00:00Z