Hönisch, Bärbel; Hemming, N Gary (2005): B-isotope and Mg/Ca ratios of planktonic foraminifera from ODP Hole 108-668B and esimates of salinity, alkalinity and pCO2 (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.712921, Supplement to: Hönisch, B; Hemming, NG (2005): Surface ocean pH response to variations in pCO2 through two full glacial cycles. Earth and Planetary Science Letters, 236(1-2), 305-314, https://doi.org/10.1016/j.epsl.2005.04.027
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Abstract:
Knowledge of past atmospheric pCO2 is important for evaluating the role of greenhouse gases in climate forcing. Ice core records show the tight correlation between climate change and pCO2, but records are limited to the past ~900 kyr. We present surface ocean pH and pCO2 data, reconstructed from boron isotopes in planktonic foraminifera over two full glacial cycles (0-140 and 300-420 kyr). The data co-vary strongly with the Vostok pCO2-record and demonstrate that the coupling between surface ocean chemistry and the atmosphere is recorded in marine archives, allowing for quantitative estimation of atmospheric pCO2 beyond the reach of ice cores.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 4.768700 * Longitude: -20.927000
Date/Time Start: 1986-04-14T11:30:00 * Date/Time End: 1986-04-15T04:45:00
Minimum Elevation: -2693.5 m * Maximum Elevation: -2693.5 m
Event(s):
108-668B * Latitude: 4.768700 * Longitude: -20.927000 * Date/Time Start: 1986-04-14T11:30:00 * Date/Time End: 1986-04-15T04:45:00 * Elevation: -2693.5 m * Penetration: 31.2 m * Recovery: 31.21 m * Location: South Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 31.2 m cored; 0 m drilled; 100 % recovery
Comment:
Continental ice volume effect on d18Oseawater and sea level was derived from Waelbroeck et al. (2002, doi:10.1016/S0277-3791(01)00101-9). Model 1 uses the deconvolution of foraminiferal d18O and Mg/Ca to yield local salinity, Model 2 uses the theoretical concentration of salt due to changing sea level. Ages are derived from correlation of the ODP 668B oxygen isotope stratigraphy with the Vostok gas age scale. Boron data are acceptable if >=3. Note that ages of samples 19-22 were estimated by extending the linear correlation between the Vostok gas age scale and the sedimentation rate in ODP 668B.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | AGE | Age | ka BP | Geocode | ||
| 2 | Sample code/label | Sample label | Hönisch, Bärbel | DSDP/ODP/IODP sample designation | ||
| 3 | δ11B | δ11B | ‰ SRM | Hönisch, Bärbel | Thermal Ionization Mass Spectrometry (TIMS) | Geochemical proxy data, 50 shells Globigerinoides sacculifer 515-865 m fraction |
| 4 | δ11B, standard deviation | δ11B std dev | ± | Hönisch, Bärbel | Thermal Ionization Mass Spectrometry (TIMS) | Geochemical proxy data |
| 5 | Number | No | Hönisch, Bärbel | Geochemical proxy data | ||
| 6 | pH | pH | Hönisch, Bärbel | Calculated | Geochemical proxy data, SWS | |
| 7 | Globigerinoides ruber, Magnesium/Calcium ratio | G. ruber Mg/Ca | mmol/mol | Hönisch, Bärbel | Inductively coupled plasma - mass spectrometry (ICP-MS) | Geochemical proxy data, 44-73 shells G. ruber white 250-300 m size fraction |
| 8 | Magnesium/Calcium ratio, standard deviation | Mg/Ca std dev | ± | Hönisch, Bärbel | Inductively coupled plasma - mass spectrometry (ICP-MS) | Geochemical proxy data |
| 9 | Sea surface temperature, annual mean | SST (1-12) | °C | Hönisch, Bärbel | Calculated from Mg/Ca ratios (Dekens et al. 2002) | Geochemical proxy data |
| 10 | Mass | Mass | µg | Hönisch, Bärbel | weight/shell | |
| 11 | δ18O, water | δ18O H2O | ‰ SMOW | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 1, relative sea level change | |
| 12 | Salinity | Sal | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 1 | ||
| 13 | Alkalinity, total | AT | µmol/kg | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 1 | |
| 14 | Carbon dioxide, partial pressure | pCO2 | ppmv | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 1 | |
| 15 | Sea level variation | Sea lev var | m | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 2, relative sea level. | |
| 16 | Salinity | Sal | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 2 | ||
| 17 | Alkalinity, total | AT | µmol/kg | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 2 | |
| 18 | Carbon dioxide, partial pressure | pCO2 | ppmv | Hönisch, Bärbel | Salinity and alkalinity reconstruction Model 2 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
308 data points