I/Ca and carbon and oxygen isotopes of N. pachyderma and C. cf. wuellerstorf at sediment cores PS2547-3 and JR179-TC493, supplement to: Lu, Zunli; Hoogakker, Babette A A; Hillenbrand, Claus-Dieter; Zhou, Xiaoli; Thomas, Ellen; Gutchess, Kristina M; Lu, Wanyi; Jones, Luke; Rickaby, Rosalind E M (2016): Oxygen depletion recorded in upper waters of the glacial Southern Ocean. Nature Communications, 7, 11146

Zunli Lu, Babette A A Hoogakker, Claus-Dieter Hillenbrand, Xiaoli Zhou, Ellen Thomas, Kristina M Gutchess, Wanyi Lu, Luke Jones & Rosalind E M Rickaby
Oxygen depletion in the upper ocean is commonly associated with poor ventilation and storage of respired carbon, potentially linked to atmospheric CO2 levels. Iodine to calcium ratios (I/Ca) in recent planktonic foraminifera suggest that values less than ~2.5 µmol/mol indicate the presence of O2-depleted water. Here we apply this proxy to estimate past dissolved oxygen concentrations in the near surface waters of the currently well-oxygenated Southern Ocean, which played a critical role in carbon sequestration...
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