A 1.46-million-year record of atmospheric CO2 from sedimentary leaf wax


A great deal of effort is now focused on reconstructing atmospheric CO2 during periods of lower polar ice volume to better constrain carbon cycling under conditions similar to those expected in the future. Here we reconstruct the past 1,460,000 years of atmospheric CO2 by taking advantage of the unique relationship between CO2 concentration and leaf wax δ13C value resulting from changes in the distribution of plant functional types in East India. We find that CO2 variability is tightly coupled with variability of global ice volume and deep-ocean circulation on glacial–interglacial timescales. However, unexpectedly, interglacial CO2 concentrations were lower before the mid-Pleistocene transition (MPT; 900,000 years ago) than after it, despite the smaller continental ice volume. In contrast, CO2 covaried continuously with deep-ocean carbon isotopes. A shift in the relative phase of CO2 and ice volume cycles occurred during the MPT. These findings suggest that deep-ocean circulation controlled the long-term CO2 trend, and the interaction between CO2, continental ice, and deep-ocean circulation was reorganized during the MPT.

DOI https://doi.pangaea.de/10.1594/PANGAEA.937828
Related Identifier IsDocumentedBy https://cmgds.marine.usgs.gov/catalog/spcmsc/Foram_Mg_Ca_metadata.faq.html
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.937828
Creator Yamamoto, Masanobu (ORCID: 0000-0003-1312-825X); Clemens, Steven C ORCID logo; Seki, Osamu; Tsuchiya, Yuko; Huang, Yongsong ORCID logo; O'ishi, Ryouta; Abe-Ouchi, Ayako ORCID logo
Publisher PANGAEA
Publication Year 2024
Funding Reference Japan Society for the Promotion of Science https://doi.org/10.13039/501100001691 Crossref Funder ID 19H05595 https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H05595 JSPS KAKENHI
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints); https://creativecommons.org/licenses/by/4.0/
OpenAccess false
Resource Type Dataset
Format text/tab-separated-values
Size 5904 data points
Discipline Earth System Research
Spatial Coverage (85.735W, 19.084S, 85.735E, 19.084N); Bay of Bengal
Temporal Coverage Begin 2015-01-10T22:25:00Z
Temporal Coverage End 2015-01-12T00:05:00Z