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Paul, Allanah J; Stuhr, Annegret; Boxhammer, Tim (2018): KOSMOS Finland 2012 mesocosm study: Phytoplankton biomass and pigment concentration, Nitrogen cycle parameters. PANGAEA,, Supplement to: Paul, Allanah J; Achterberg, Eric Pieter; Bach, Lennart Thomas; Boxhammer, Tim; Czerny, Jan; Haunost, Mathias; Schulz, Kai Georg; Stuhr, Annegret; Riebesell, Ulf (2016): No observed effect of ocean acidification on nitrogen biogeochemistry in a summer Baltic Sea plankton community. Biogeosciences, 13(13), 3901-3913,

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Nitrogen fixation by filamentous cyanobacteria supplies significant amounts of new nitrogen (N) to the Baltic Sea. This balances N loss processes such as denitrification and anammox, and forms an important N source supporting primary and secondary production in N-limited post-spring bloom plankton communities. Laboratory studies suggest that filamentous diazotrophic cyanobacteria growth and N2-fixation rates are sensitive to ocean acidification, with potential implications for new N supply to the Baltic Sea. In this study, our aim was to assess the effect of ocean acidification on diazotroph growth and activity as well as the contribution of diazotrophically fixed N to N supply in a natural plankton assemblage. We enclosed a natural plankton community in a summer season in the Baltic Sea near the entrance to the Gulf of Finland in six large-scale mesocosms (volume ∼ 55m3) and manipulated fCO2 over a range relevant for projected ocean acidification by the end of this century (average treatment fCO2: 365–1231µatm).
Related to:
Paul, Allanah J; Schulz, Kai Georg; Achterberg, Eric Pieter; Hellemann, Dana; Nausch, Monika; Boxhammer, Tim; Bach, Lennart Thomas; Trense, Yves (2016): KOSMOS Finland 2012 mesocosm study: carbonate chemistry, particulate and dissolved matter pools, and phytoplankton community composition using marker pigments (CHEMTAX). PANGAEA,
Latitude: 59.858330 * Longitude: 23.258330
Date/Time Start: 2012-06-19T00:00:00 * Date/Time End: 2012-08-04T00:00:00
KOSMOS_2012_Tvaerminne * Latitude: 59.858330 * Longitude: 23.258330 * Date/Time: 2012-06-12T00:00:00 * Method/Device: Mesocosm experiment (MESO)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimePaul, Allanah JGeocode
2Day of experimentDOEdayPaul, Allanah J
3Mesocosm labelMeso labelPaul, Allanah J
4PhasePhasePaul, Allanah J
5Chaetoceros sp., biomass as carbonChaetoceros sp. Cµg/lStuhr, Annegret
6Skeletonema marinoiS. marinoi#/lStuhr, Annegretµg/l
7Aphanizomenon flos-aquae, biomass as carbonA. flos-aquae Cµg/lStuhr, Annegret
8AphanizophyllAphanizoµg/lBoxhammer, Tim
9δ15Nδ15N‰ airPaul, Allanah Jsuspended particulate material
10δ15Nδ15N‰ airBoxhammer, Timsinking particulate material
11Nitrogen fixation rateN2 fixnmol/l/dayPaul, Allanah J
1870 data points

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