Alkenone and boron based Oligocene pCO2 records

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...

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Bibliographic Details
Main Authors: Seki, Osamu, Foster, Gavin L, Schmidt, Daniela N, Mackensen, Andreas, Kawamura, Kimitaka, Pancost, Richard D
Format: Dataset
Language:English
Published: PANGAEA 2010
Subjects:
154-925E
154-926A
154-927B
154-928A
154-929A
165-999A
202-1241A
Caribbean Sea
DRILL
Drilling/drill rig
Joides Resolution
Leg154
Leg165
Leg202
North Atlantic Ocean
North Pacific Ocean
Ocean Drilling Program
ODP
Pacific
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.732923
https://doi.org/10.1594/PANGAEA.732923
Description
Summary: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.

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