Seki, Osamu; Foster, Gavin L; Schmidt, Daniela N; Mackensen, Andreas; Kawamura, Kimitaka; Pancost, Richard D (2010): Alkenone and boron based Oligocene pCO2 records. doi:10.1594/PANGAEA.732923,
Supplement to: Seki, O et al. (2010): Alkenone and boron based Pliocene pCO2 records. Earth and Planetary Science Letters, 292(1-2), 201-211, doi:10.1016/j.epsl.2010.01.037
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The Pliocene period is the most recent time when the Earth was globally significantly (~3°C) warmer than today. However, the existing pCO2 data for the Pliocene are sparse and there is little agreement between the various techniques used to reconstruct palaeo-pCO2. Moreover, the temporal resolution of the published records does not allow a robust assessment of the role of declining pCO2 in the intensification of the Northern Hemisphere Glaciation (INHG) and a direct comparison to other proxy records are lacking. For the first time, we use a combination of foraminiferal (delta11B) and organic biomarker (alkenone-derived carbon isotopes) proxies to determine the concentration of atmospheric CO2 over the past 5 Ma. Both proxy records show that during the warm Pliocene pCO2 was between 330 and 400 ppm, i.e. similar to today. The decrease to values similar to pre-industrial times (275-285 ppm) occurred between 3.2 Ma and 2.8 Ma - coincident with the INHG and affirming the link between global climate, the cryosphere and pCO2.
Median Latitude: 8.935197 * Median Longitude: -68.291053 * South-bound Latitude: 3.719100 * West-bound Longitude: -86.444500 * North-bound Latitude: 12.744000 * East-bound Longitude: -42.908100
Date/Time Start: 1994-02-13T16:45:00 * Date/Time End: 2002-05-22T19:20:00
154-925E * Latitude: 4.204280 * Longitude: -43.488900 * Date/Time Start: 1994-02-13T16:45:00 * Date/Time End: 1994-02-14T04:00:00 * Elevation: -3053.0 m * Penetration: 54.5 m * Recovery: 55.65 m * Location: North Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 54.5 m cored; 0 m drilled; 102.1 % recovery
154-926A * Latitude: 3.719100 * Longitude: -42.908100 * Date/Time Start: 1994-02-19T11:30:00 * Date/Time End: 1994-02-21T10:30:00 * Elevation: -3610.0 m * Penetration: 327 m * Recovery: 334.92 m * Location: North Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 35 cores; 327 m cored; 0 m drilled; 102.4 % recovery
154-927B * Latitude: 5.462900 * Longitude: -44.480600 * Date/Time Start: 1994-03-01T15:54:00 * Date/Time End: 1994-03-03T15:00:00 * Elevation: -3327.0 m * Penetration: 261.5 m * Recovery: 267.53 m * Location: North Atlantic Ocean * Campaign: Leg154 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 28 cores; 261.5 m cored; 0 m drilled; 102.3 % recovery