Data Description

Citation:
Barcelos e Ramos, J et al. (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, Joana; Biswas, Haimanti; Schulz, Kai Georg; LaRoche, Julie; Riebesell, Ulf (2007): Effect of rising atmospheric carbon dioxide on the marine nitrogen fixer Trichodesmium. Global Biogeochemical Cycles, 21, doi:10.1029/2006GB002898
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.
Project(s):
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 treatment *Exp trtmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
2Salinity *SalBarcelos e Ramos, Joana *
3Temperature, water *Temp°CBarcelos e Ramos, Joana *
4Carbonate system computation flag *CSC flagNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
5pH *pHNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *Total scale
6Alkalinity, total *ATµmol/kgBarcelos e Ramos, Joana *Titration potentiometric, 794 Basic Titrino (Metrohm) *
7Carbon, inorganic, dissolved *DICµmol/kgBarcelos e Ramos, Joana *Automated segmented-flow analyzer (Quaatro) *
8Carbon dioxide *CO2µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
9Carbonate ion *[CO3]2-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
10Bicarbonate ion *[HCO3]-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
11Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
12Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
13Aragonite saturation state *Omega ArgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
14Calcite saturation state *Omega CalNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
15Carbon, organic, particulate *POCµmol/lBarcelos e Ramos, Joana *Gas chromatography (EURO EA Elemental Analyser, EUROVECTOR) *
16Nitrogen, organic, particulate *PONµmol/lBarcelos e Ramos, Joana *Gas chromatography (EURO EA Elemental Analyser, EUROVECTOR) *
17Phosphorus, organic, particulate *POPµmol/lBarcelos e Ramos, Joana *Spectrophotometry *
18Nitrogen fixation rate, per cell *N2 fixfmol/#/hBarcelos e Ramos, Joana *Determined by acetylene reduction assay using a gas chromatograph *
19Chlorophyll a per cell *Chl apg/#Barcelos e Ramos, Joana *Measured *
20Nitrogen per cell *N cellpmolBarcelos e Ramos, Joana *
21Carbon per cell *C cellpmolBarcelos e Ramos, Joana *
22Phosphate per cell *PO4 cellpmolBarcelos e Ramos, Joana *
23Trichodesmium cells *Trichod cells#/lBarcelos e Ramos, Joana *Counting *
License:
Size:
414 data points

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