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


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 during glacial times. A down-core planktonic I/Ca record from south of the Antarctic Polar Front (APF) suggests that minimum O2 concentrations in the upper ocean fell below 70 µmol/kg during the last two glacial periods, indicating persistent glacial O2 depletion at the heart of the carbon engine of the Earth's climate system. These new estimates of past ocean oxygenation variability may assist in resolving mechanisms responsible for the much-debated ice-age atmospheric CO2 decline.

DOI http://dx.doi.org/doi:10.1594/PANGAEA.869451
Metadata Access http://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite3&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.869451
Creator Hillenbrand, Claus-Dieter;Hoogakker, Babette A A;Rickaby, Rosalind E M;Lu, Zunli;Zhou, Xiaoli;Lu, Wanyi;Gutchess, Kristina M;Thomas, Ellen;Jones, Luke
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2016
Rights Creative Commons Attribution 3.0 Unported (CC-BY)
Language English
Resource Type Supplementary Collection of Datasets
Format application/zip
Discipline Earth System Research
Spatial Coverage (71S-62N,120W-61E)
Temporal Point 1986-03-04T11:59:59Z