Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Barcelos e Ramos, Joana; Biswas, Haimanti; Schulz, Kai Georg; LaRoche, Julie; Riebesell, Ulf (2007): Seawater carbonate chemistry and particulate organic particles during a semicontinuous batch culture experiment with Trichodesmium IMS101, 2007. doi:10.1594/PANGAEA.716818,
Supplement to: Barcelos e Ramos, J et al. (2007): Effect of rising atmospheric carbon dioxide on the marine nitrogen fixer Trichodesmium. Global Biogeochemical Cycles, 21, doi:10.1029/2006GB002898

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX Citation

Abstract:
Diazotrophic (N2-fixing) cyanobacteria provide the biological source of new nitrogen for large parts of the ocean. However, little is known about their sensitivity to global change. Here we show that the single most important nitrogen fixer in today's ocean, Trichodesmium, is strongly affected by changes in CO2 concentrations. Cell division rate doubled with rising CO2 (glacial to projected year 2100 levels) prompting lower carbon, nitrogen and phosphorus cellular contents, and reduced cell dimensions. N2 fixation rates per unit of phosphorus utilization as well as C:P and N:P ratios more than doubled at high CO2, with no change in C:N ratios. This could enhance the productivity of N-limited oligotrophic oceans, drive some of these areas into P limitation, and increase biological carbon sequestration in the ocean. The observed CO2 sensitivity of Trichodesmium could thereby provide a strong negative feedback to atmospheric CO2 increase.
Comment:
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).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Experimental treatmentExp trtmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
2SalinitySalBarcelos e Ramos, Joana
3Temperature, waterTemp°CBarcelos e Ramos, Joana
4Carbonate system computation flagCSC flagNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
5pHpHNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)Total scale
6Alkalinity, totalATµmol/kgBarcelos e Ramos, JoanaTitration potentiometric, 794 Basic Titrino (Metrohm)
7Carbon, inorganic, dissolvedDICµmol/kgBarcelos e Ramos, JoanaAutomated segmented-flow analyzer (Quaatro)
8Carbon dioxideCO2µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
9Carbonate ion[CO3]2-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
10Bicarbonate ion[HCO3]-µmol/kgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
11Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
12Fugacity of carbon dioxide (water) at sea surface temperature (wet air)fCO2water_SST_wetµatmNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
13Aragonite saturation stateOmega ArgNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
14Calcite saturation stateOmega CalNisumaa, Anne-MarinCalculated using seacarb after Nisumaa et al. (2010)
15Carbon, organic, particulatePOCµmol/lBarcelos e Ramos, JoanaGas chromatography (EURO EA Elemental Analyser, EUROVECTOR)
16Nitrogen, organic, particulatePONµmol/lBarcelos e Ramos, JoanaGas chromatography (EURO EA Elemental Analyser, EUROVECTOR)
17Phosphorus, organic, particulatePOPµmol/lBarcelos e Ramos, JoanaSpectrophotometry
18Nitrogen fixation rate, per cellN2 fixfmol/#/hBarcelos e Ramos, JoanaDetermined by acetylene reduction assay using a gas chromatograph
19Chlorophyll a per cellChl apg/#Barcelos e Ramos, JoanaMeasured
20Nitrogen per cellN cellpmolBarcelos e Ramos, Joana
21Carbon per cellC cellpmolBarcelos e Ramos, Joana
22Phosphate per cellPO4 cellpmolBarcelos e Ramos, Joana
23Trichodesmium cellsTrichod cells#/lBarcelos e Ramos, JoanaCounting
Size:
414 data points

Download Data

Download dataset as tab-delimited text (use the following character encoding: )

View dataset as HTML