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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). 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.
Project(s):
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: North Atlantic Ocean * Campaign: Leg108 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 4 cores; 31.2 m cored; 0 m drilled; 100 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1AGEAgeka BPGeocode
2Sample code/labelSample labelHönisch, BärbelODP sample designation
3Globigerinoides ruber white, d18OG. ruber w d18Oper mil PDBHönisch, Bärbel250-300 µm
4delta 11Bd11Bper mil SRMHönisch, BärbelGlobigerinoides sacculifer, 515-865 µm
5CommentCommentHönisch, Bärbeld11B, TRITON at LDEO data were corrected for a -1.1 offset between data measured at LDEO and NBS at SUNY SB
6pHpHHönisch, BärbelCalculatedSWS
7Error, absoluteError a±Hönisch, BärbelCalculatedpH, uncertainty
8Globigerinoides ruber white, Magnesium/Calcium ratioG. ruber w Mg/CaHönisch, BärbelICP-AES, Inductively coupled plasma - atomic emission spectroscopymmol/mol, 250-300 µm
9Sea surface temperature, annual meanSST (1-12)°CHönisch, BärbelCalculated from Mg/Ca ratios
10Sea surface temperature, annual meanSST (1-12)°CHönisch, BärbelCalculated from Mg/Ca ratiossalinity corrected
11SalinitySalHönisch, BärbelCalculated
12Alkalinity, totalATµmol/kgHönisch, BärbelCalculatedconstant
13Alkalinity, totalATµmol/kgHönisch, BärbelCalculatedvarying 4%
14Alkalinity, totalATµmol/kgHönisch, BärbelCalculatedvarying 8%
15Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHönisch, BärbelCalculatedconstant alkalinity
16Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHönisch, BärbelCalculatedSST salinity corrected
17Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHönisch, BärbelCalculatedvarying alkalinity 4%
18Partial pressure of carbon dioxide, standard deviationpCO2 std dev±Hönisch, BärbelCalculateduncertainty
19Partial pressure of carbon dioxide (water) at sea surface temperature (wet air)pCO2water_SST_wetµatmHönisch, BärbelCalculatedvarying alkalinity 8%
Size:
978 data points

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