Organic carbon abundance and stable isotope record of sediment core RC13-259 (Table 1)

DOI

We use the isotopic composition of carbon from organic matter enclosed within diatom frustules as a proxy for paleoproductivity and paleo-dissolved carbon dioxide concentrations in ocean surface waters. A Southern Ocean record from south of the Antarctic Polar Front and spanning 430,000 years of carbon isotopic variation in diatomaceous organic matter is presented for the first time. The most refractory diatomaceous organic matter fraction was extracted and analyzed to avoid problems associated with diagenesis. The results clearly indicate cyclic changes in organic carbon isotopic ratios, with 13C depleted values associated with all of the last five glacial periods, reflecting changes in surface water properties and primary productivity. Changes in dissolved carbon dioxide concentrations are the most probable cause of these cycles, but the possible effect of seawater pH changes cannot be excluded.

Age based on Eucampia antarctica stratigraphy (Burckle and Cooke, 1983) correlated to oxygen isotopic stages (Imbrie et al., 1984)

Supplement to: Singer, Alex; Shemesh, Aldo (1995): Climatically linked carbon isotope variation during the past 430,000 years in Southern Ocean sediments. Paleoceanography, 10(2), 171-178

Identifier
DOI https://doi.org/10.1594/PANGAEA.52708
Related Identifier https://doi.org/10.1029/94PA03319
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.52708
Provenance
Creator Singer, Alex; Shemesh, Aldo
Publisher PANGAEA
Publication Year 1995
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Language English
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 170 data points
Discipline Earth System Research
Spatial Coverage (-4.930 LON, -53.880 LAT)