Data Description

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Citation:
Beaufort, L et al. (2011): Seawater carbonate chemistry and Emiliania huxleyi mass and size, 2011. doi:10.1594/PANGAEA.767576,
Supplement to: Beaufort, Luc; Probert, Ian; de Garidel-Thoron, Thibault; Bendif, E M; Ruiz-Pino, Diana; Metzi, N; Goyet, Catherine; Buchet, N; Coupel, P; Grelaud, Michaël; Rost, Björn; Rickaby, Rosalind EM; de Vargas, Colomban (2011): Sensitivity of coccolithophores to carbonate chemistry and ocean acidification. Nature, 476, 80-83, doi:10.1038/nature10295
Abstract:
About one-third of the carbon dioxide (CO2) released into the atmosphere as a result of human activity has been absorbed by the oceans, where it partitions into the constituent ions of carbonic acid. This leads to ocean acidification, one of the major threats to marine ecosystems and particularly to calcifying organisms such as corals, foraminifera and coccolithophores. Coccolithophores are abundant phytoplankton that are responsible for a large part of modern oceanic carbonate production. Culture experiments investigating the physiological response of coccolithophore calcification to increased CO2 have yielded contradictory results between and even within species. Here we quantified the calcite mass of dominant coccolithophores in the present ocean and over the past forty thousand years, and found a marked pattern of decreasing calcification with increasing partial pressure of CO2 and concomitant decreasing concentrations of CO3. Our analyses revealed that differentially calcified species and morphotypes are distributed in the ocean according to carbonate chemistry. A substantial impact on the marine carbon cycle might be expected upon extrapolation of this correlation to predicted ocean acidification in the future. However, our discovery of a heavily calcified Emiliania huxleyi morphotype in modern waters with low pH highlights the complexity of assemblage-level responses to environmental forcing factors.
Project(s):
Coverage:
Median Latitude: -3.131324 * Median Longitude: 41.478767 * South-bound Latitude: -71.833000 * West-bound Longitude: -142.250000 * North-bound Latitude: 43.683000 * East-bound Longitude: 146.400000
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
1Sample ID *IDBeaufort, Luc *
2LATITUDE *LatitudeGeocode
3LONGITUDE *LongitudeGeocode
4Age, dated *Age datedkaBeaufort, Luc *
5Emiliania huxleyi, weight *E. huxleyi WpgBeaufort, Luc *Estimated by measuring brightness in cross-polarized light (birefringence) *
6Emiliania huxleyi, weight, standard error *E. huxleyi W std e±Beaufort, Luc *
7Emiliania huxleyi, diameter *E. huxleyi diamµmBeaufort, Luc *Measured and/or detected by SYRACO software *
8Replicates *N#Beaufort, Luc *
9Salinity *SalBeaufort, Luc *CTD, SEA-BIRD SBE 911plus *
10Temperature, water *Temp°CBeaufort, Luc *CTD, SEA-BIRD SBE 911plus *
11Alkalinity, total *ATµmol/kgBeaufort, Luc *Titration potentiometric *
12Total carbon *TCµmol/kgBeaufort, Luc *Titration potentiometric *
13pH *pHBeaufort, Luc *Calculated using CO2SYS *Sea water scale
14Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmBeaufort, Luc *Calculated using CO2SYS *
15Carbonate ion *[CO3]2-µmol/kgBeaufort, Luc *Calculated using CO2SYS *
16Carbonate system computation flag *CSC flagNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
17pH *pHNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *Total scale
18Carbon dioxide *CO2µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
19Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) *pCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
20Fugacity of carbon dioxide (water) at sea surface temperature (wet air) *fCO2water_SST_wetµatmNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
21Bicarbonate ion *[HCO3]-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
22Carbonate ion *[CO3]2-µmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
23Total carbon *TCµmol/kgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
24Aragonite saturation state *Omega ArgNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
25Calcite saturation state *Omega CalNisumaa, Anne-Marin *Calculated using seacarb after Nisumaa et al. (2010) *
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