Seawater carbonate chemistry and environmental data, and nutrients of KOSMOS Bergen 2015 mesocosm study

DOI

The oceans' uptake of anthropogenic carbon dioxide (CO2) decreases seawater pH and alters the inorganic carbon speciation – summarized in the term ocean acidification (OA). Already today, coastal regions experience episodic pH events during which surface layer pH drops below values projected for the surface ocean at the end of the century. Future OA is expected to further enhance the intensity of these coastal extreme pH events. To evaluate the influence of such episodic OA events in coastal regions, we deployed eight pelagic mesocosms for 53 days in Raunefjord, Norway, and enclosed 56–61 m**3 of local seawater containing a natural plankton community under nutrient limited post-bloom conditions. Four mesocosms were enriched with CO2 to simulate extreme pCO2 levels of 1978-2069 μatm while the other four served as untreated controls. Here, we present results from multivariate analyses on OA-induced changes in the phyto-, micro-, and mesozooplankton community structure. Pronounced differences in the plankton community emerged early in the experiment, and were amplified by enhanced top-down control throughout the study period. The plankton groups responding most profoundly to high CO2 conditions were cyanobacteria (negative), chlorophyceae (negative), auto- and heterotrophic microzooplankton (negative), and a variety of mesozooplanktonic taxa, including copepoda (mixed), appendicularia (positive), hydrozoa (positive), fish larvae (positive), and gastropoda (negative). The restructuring of the community coincided with significant changes in the concentration and elemental stoichiometry of particulate organic matter. Results imply that extreme CO2 events can lead to a substantial reorganization of the planktonic food web, affecting multiple trophic levels from phytoplankton to primary and secondary consumers.

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.

Identifier
DOI https://doi.org/10.1594/PANGAEA.931402
Related Identifier https://doi.org/10.3389/fmars.2020.611157
Related Identifier https://doi.org/10.1594/PANGAEA.926955
Related Identifier https://doi.org/10.1594/PANGAEA.911638
Related Identifier https://cran.r-project.org/web/packages/seacarb/index.html
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.931402
Provenance
Creator Spisla, Carsten; Taucher, Jan; Bach, Lennart Thomas; Haunost, Mathias; Boxhammer, Tim; King, Andrew L; Jenkins, Bethany D; Wallace, Joselynn R; Ludwig, Andrea; Meyer, Jana; Stange, Paul; Minutolo, Fabrizio; Lohbeck, Kai T; Nauendorf, Alice; Kalter, Verena; Lischka, Silke; Sswat, Michael; Dörner, Isabel; Ismar-Rebitz, Stefanie M H; Aberle, Nicole; Yong, Jaw-Chuen; Bouquet, Jean-Marie; Lechtenbörger, Anna K; Kohnert, Peter; Krudewig, Michael; Riebesell, Ulf
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Contributor Yang, Yan
Publication Year 2021
Rights Creative Commons Attribution 4.0 International; https://creativecommons.org/licenses/by/4.0/
OpenAccess true
Representation
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 18566 data points
Discipline Earth System Research
Spatial Coverage (5.206 LON, 60.265 LAT)
Temporal Coverage Begin 2015-05-09T00:00:00Z
Temporal Coverage End 2015-06-30T00:00:00Z