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

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 car...

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Bibliographic Details
Main Authors: Singer, Alex, Shemesh, Aldo
Format: Dataset
Language:English
Published: PANGAEA 1995
Subjects:
AGE
Carbon
organic
total
DEPTH
sediment/rock
PC
Piston corer
RC13
RC13-259
Robert Conrad
δ13C
organic carbon
standard deviation
Antarctic
Southern Ocean
The Antarctic
Antarc*
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.52708
https://doi.org/10.1594/PANGAEA.52708
Description
Summary: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.

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