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Singer, Alex; Shemesh, Aldo (1995): Organic carbon abundance and stable isotope record of sediment core RC13-259 (Table 1). PANGAEA,, Supplement to: Singer, A; Shemesh, A (1995): Climatically linked carbon isotope variation during the past 430,000 years in Southern Ocean sediments. Paleoceanography, 10(2), 171-178,

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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.
Latitude: -53.880000 * Longitude: -4.930000
Date/Time Start: 1970-12-20T00:00:00 * Date/Time End: 1970-12-20T00:00:00
Minimum DEPTH, sediment/rock: 0.20 m * Maximum DEPTH, sediment/rock: 16.50 m
RC13-259 * Latitude: -53.880000 * Longitude: -4.930000 * Date/Time: 1970-12-20T00:00:00 * Elevation: -1754.0 m * Recovery: 17.54 m * Campaign: RC13 * Basis: Robert Conrad * Method/Device: Piston corer (PC)
Age based on Eucampia antarctica stratigraphy (Burckle and Cooke, 1983) correlated to oxygen isotopic stages (Imbrie et al., 1984)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Carbon, organic, totalTOC%Singer, Alex
4δ13C, organic carbonδ13C Corg‰ PDBSinger, Alex
5δ13C, standard deviationδ13C std dev±Singer, Alex
170 data points

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