(Table S1) Radiocarbon data of sediment core SO161/5 22SL


At the end of the Last Glacial Maximum (19,000 to 11,000 years ago), atmospheric carbon dioxide concentrations rose while the Delta14C of atmospheric carbon dioxide declined1, 2. These changes have been attributed to an injection of carbon dioxide with low radiocarbon activity from an oceanic abyssal reservoir that was isolated from the atmosphere for several thousand years before deglaciation3. The current understanding points to the Southern Ocean as the main area of exchange between these reservoirs4. Intermediate water formed in the Southern Ocean surrounding Antarctica would have then carried the old carbon dioxide signature to the lower-latitude oceans**5, 6. Here we reconstruct the Delta14C signature of Antarctic Intermediate Water off the coast of Chile for the past 20,000 years, using paired 14C ages of benthic and planktonic foraminifera. In contrast to the above scenario, we find that the delta14C signature of the Antarctic Intermediate Water closely matches the modelled surface ocean Delta14C, precluding the influence of an old carbon source. We suggest that if the abyssal ocean is indeed the source of the radiocarbon-depleted carbon dioxide, an alternative path for the mixing and propagation of its carbon dioxide may be required to explain the observed changes in atmospheric carbon dioxide concentration and radiocarbon activity.

UCIAMS-64329: The large error in this measurement is due to the very small sample size (15 µg C)

Supplement to: De Pol-Holz, Ricardo; Keigwin, Lloyd D; Southon, John R; Hebbeln, Dierk; Mohtadi, Mahyar (2010): No signature of abyssal carbon in intermediate waters off Chile during deglaciaition. Nature Geoscience, 3(3), 192-195

DOI https://doi.org/10.1594/PANGAEA.735788
Related Identifier https://doi.org/10.1038/ngeo745
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.735788
Creator De Pol-Holz, Ricardo ORCID logo; Keigwin, Lloyd D; Southon, John R; Hebbeln, Dierk ORCID logo; Mohtadi, Mahyar ORCID logo
Publisher PANGAEA
Publication Year 2010
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 209 data points
Discipline Earth System Research
Spatial Coverage (-73.675 LON, -36.219 LAT)
Temporal Coverage Begin 2001-12-31T13:43:00Z
Temporal Coverage End 2001-12-31T13:45:00Z