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- Title
Atmospheric CO<sub>2</sub> estimates for the Miocene to Pleistocene based on foraminiferal δ<sup>11</sup>B at Ocean Drilling Program Sites 806 and 807 in the Western Equatorial Pacific.
- Authors
Guillermic, Maxence; Misra, Sambuddha; Eagle, Robert; Tripati, Aradhna
- Abstract
Constraints on the evolution of atmospheric CO2 levels throughout Earth's history are foundational to our understanding of past variations in climate. Despite considerable effort, estimates of past CO2 levels do not always converge and therefore new records and proxies are valuable. Here we reconstruct atmospheric CO2 values across major climate transitions over the past 17 million years using the boron isotopic composition (δ11B) of planktic foraminifera from 89 samples obtained from two sites in the West Pacific Warm Pool, Ocean Drilling Program (ODP) Sites 806 and 807. These sites are in a region that today is in equilibrium with the atmosphere and are thought to have been in equilibrium with the atmosphere for the interval studied. We use high-precision multi-collector inductively29 coupled plasma mass spectrometry and show that data from these sites can reproduce the ice core record. Estimates of early Miocene pCO2 are generally higher than published reconstructions from other sites, while values for the Pliocene and Pleistocene are more similar to other datasets. We find evidence for reductions in pCO2 of ~280 µatm during the Middle Miocene Climate Transition, ~270 µatm during Pliocene Glacial Intensification, and ~50 µatm during the Mid-Pleistocene Climate Transition. There is possible evidence for a larger reduction in glacial pCO2 during the Mid-Pleistocene Transition compared to interglacial pCO2, and a minimum in pCO2 during glacial MIS 30. Our results are consistent with a coupling between pCO2, temperature and ice sheet expansion throughout the past 17 million years. Highlights: In this study, we are able to accurately reproduce pCO2 data from ice cores using δ11B data from ODP Sites 806 and 807, demonstrating the fidelity of our approach. We therefore apply the same framework to older samples to create a long-term pH and pCO2 reconstruction for the past 17 million years. We find major increases in surface water pH and decreases in atmospheric pCO2 were associated with decreased temperature in the Western Equatorial Pacific, including associated with major episodes of ice sheet expansion in the high latitudes, providing more robust quantitative constraints on the past coupling between pCO2, temperature, and cryosphere stability.
- Subjects
INDUCTIVELY coupled plasma mass spectrometry; ICE cores; ICE sheets; BORON isotopes; WATER; CRYOSPHERE
- Publication
Climate of the Past Discussions, 2021, p1
- ISSN
1814-9324
- Publication type
Article
- DOI
10.5194/cp-2020-158P