Atmospheric CO2 estimates for the Miocene to Pleistocene based on foraminiferal $δ^{11}$B at Ocean Drilling Program Sites 806 and 807 in the Western Equatorial Pacific

Guillermic, Maxence; Misra, Sambuddha; Eagle, Robert; Tripati, Aradhna

doi:10.5194/cp-18-183-2022

Title: Atmospheric CO₂ estimates for the Miocene to Pleistocene based on foraminiferal $$δ^{11}$$B at Ocean Drilling Program Sites 806 and 807 in the Western Equatorial Pacific

Journal Article · 01 February 2022 · Climate of the Past (Online)

DOI: https://doi.org/10.5194/cp-18-183-2022 · OSTI ID:1981297

Guillermic, Maxence ^[1]; Misra, Sambuddha ^[2]; Eagle, Robert ^[3]; Tripati, Aradhna ^[3]

University of California, Los Angeles, CA (United States); Institut Universitaire Européen de la Mer Plouzane (France); University of California – Los Angeles, Los Angeles, CA 90095 USA
Indian Institute of Science, Bengaluru (India); University of Cambridge (United Kingdom)
University of California, Los Angeles, CA (United States); Institut Universitaire Européen de la Mer Plouzane (France)

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, records vary in their temporal and spatial coverage and 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 16 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, measured using high-precision multi-collector inductively coupled plasma mass spectrometry. We compare our results to published data from ODP Site 872, also in the Western Equatorial Pacific, that goes back to 22 million years ago. These sites are in a region that today is near equilibrium with the atmosphere and are thought to have been in equilibrium with the atmosphere for the interval studied. We show that δ¹¹B data from this region are consistent with other boron-based studies. The data show evidence for elevated pCO₂ during the Middle Miocene and Early to Middle Pliocene, and reductions in pCO₂ of ~200 ppm during the Middle Miocene Climate Transition, ~250 ppm during Pliocene Glacial Intensification and ~50 ppm during the Mid-Pleistocene Climate Transition. During the Mid-Pleistocene Transition there is a minimum pCO₂ at marine isotopic stage (MIS) 30. Our results are consistent with a coupling between pCO₂, temperature and ice sheet expansion from the Miocene to the late Quaternary.

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Research Organization:: University of California, Los Angeles, CA (United States)

Sponsoring Organization:: French government; International Association of GeoChemistry (IAGC); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0010288

OSTI ID:: 1981297

Journal Information:: Climate of the Past (Online), Journal Name: Climate of the Past (Online) Journal Issue: 2 Vol. 18; ISSN 1814-9332

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Atmospheric CO2 estimates for the Miocene to Pleistocene based on foraminiferal $$δ^{11}$$B at Ocean Drilling Program Sites 806 and 807 in the Western Equatorial Pacific

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Title: Atmospheric CO₂ estimates for the Miocene to Pleistocene based on foraminiferal $$δ^{11}$$B at Ocean Drilling Program Sites 806 and 807 in the Western Equatorial Pacific