Hönisch, Bärbel; Hemming, N Gary; Archer, David E; Siddall, Mark; McManus, Jerry F (2009): B- and O-isotope and Mg/Ca ratios of planktonic foraminifera and estimates of salinity, alkalinity and pCO2 for ODP Hole 108-668B (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.721741, Supplement to: Hönisch, B et al. (2009): Atmospheric Carbon Dioxide Concentration Across the Mid-Pleistocene Transition. Science, 324(5934), 1551-1554, https://doi.org/10.1126/science.1171477
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Abstract:
The dominant period of Pleistocene glacial cycles changed during the mid-Pleistocene from 40,000 years to 100,000 years, for as yet unknown reasons. Here we present a 2.1-million-year record of sea surface partial pressure of CO2 (PCO2), based on boron isotopes in planktic foraminifer shells, which suggests that the atmospheric partial pressure of CO2 (pCO2) was relatively stable before the mid-Pleistocene climate transition. Glacial PCO2 was ~31 microatmospheres higher before the transition (more than 1 million years ago), but interglacial PCO2 was similar to that of late Pleistocene interglacial cycles (<450,000 years ago). These estimates are consistent with a close linkage between atmospheric CO2 concentration and global climate, but the lack of a gradual decrease in interglacial PCO2 does not support the suggestion that a long-term drawdown of atmospheric CO2 was the main cause of the climate transition.
Other version:
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
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 | Globigerinoides ruber white, δ18O | G. ruber w δ18O | ‰ PDB | Hönisch, Bärbel | 250-300 µm | |
| 4 | δ11B | δ11B | ‰ SRM | Hönisch, Bärbel | Globigerinoides sacculifer, 515-865 µm | |
| 5 | Comment | Comment | Hönisch, Bärbel | d11B, TRITON at LDEO data were corrected for a -1.1 offset between data measured at LDEO and NBS at SUNY SB | ||
| 6 | pH | pH | Hönisch, Bärbel | Calculated | SWS | |
| 7 | Error, absolute | Error a | ± | Hönisch, Bärbel | Calculated | pH, uncertainty |
| 8 | Globigerinoides ruber white, Magnesium/Calcium ratio | G. ruber w Mg/Ca | Hönisch, Bärbel | Inductively coupled plasma atomic emission spectroscope (ICP-AES) | mmol/mol, 250-300 µm | |
| 9 | Sea surface temperature, annual mean | SST (1-12) | °C | Hönisch, Bärbel | Calculated from Mg/Ca ratios | |
| 10 | Sea surface temperature, annual mean | SST (1-12) | °C | Hönisch, Bärbel | Calculated from Mg/Ca ratios | salinity corrected |
| 11 | Salinity | Sal | Hönisch, Bärbel | Calculated | ||
| 12 | Alkalinity, total | AT | µmol/kg | Hönisch, Bärbel | Calculated | constant |
| 13 | Alkalinity, total | AT | µmol/kg | Hönisch, Bärbel | Calculated | varying 4% |
| 14 | Alkalinity, total | AT | µmol/kg | Hönisch, Bärbel | Calculated | varying 8% |
| 15 | Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) | pCO2water_SST_wet | µatm | Hönisch, Bärbel | Calculated | constant alkalinity |
| 16 | Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) | pCO2water_SST_wet | µatm | Hönisch, Bärbel | Calculated | SST salinity corrected |
| 17 | Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) | pCO2water_SST_wet | µatm | Hönisch, Bärbel | Calculated | varying alkalinity 4% |
| 18 | Partial pressure of carbon dioxide, standard deviation | pCO2 std dev | ± | Hönisch, Bärbel | Calculated | uncertainty |
| 19 | Partial pressure of carbon dioxide (water) at sea surface temperature (wet air) | pCO2water_SST_wet | µatm | Hönisch, Bärbel | Calculated | varying alkalinity 8% |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
978 data points