3-7 September 2018
Audimax | Kiel University
Europe/Berlin timezone

Variations in intermediate water oxygen concentrations in the equatorial Pacific over the last 140,000 years

Not scheduled
Audimax | Kiel University

Audimax | Kiel University

Christian-Albrechts-Platz 2 | 24118 Kiel | GERMANY
Poster 09 Ocean Deoxygenation - How the Past can Inform the Future


Babette Hoogakker (The Lyell Centre, Heriot-Watt University)


Intermediate waters (500 - 2000 m) from the equatorial- to North Pacific are currently hypoxic (oxygen concentrations below 120 µmol/kg), while deeper waters are well oxygenated. For the last ice-age, proxy records suggest that this trend was reversed, with well-oxygenated Pacific intermediate waters, and lower oxygenated deeper waters associated with an increased deep carbon reservoir. Here we assess changes in bottom water oxygen concentrations at an intermediate water depth from the eastern equatorial Pacific (site ODP 1242, 1360 m depth) over the last 140,000 years, to test whether intermediate water oxygen concentrations increased during glacial intervals (e.g. Marine Isotope Stages 2 and 4). We use the carbon isotope gradient between bottom water (recorded by epifaunal benthic foraminifera Cibicidoides wuellerstorfi) and pore water at the anoxic boundary (recorded by infaunal Globobulimina spp.) as a quantitatively proxy to reconstruct intermediate water oxygen concentrations at this site, following the approach of Hoogakker et al. (2015).

Email Address b.hoogakker@hw.ac.uk
Affiliation The Lyell Centre, Heriot-Watt University
Are you a SFB 754 / Future Ocean member? No
Position Senior Scientist

Primary authors

Babette Hoogakker (The Lyell Centre, Heriot-Watt University) Dr Christopher Day (Department of Earth Sciences, University of Oxford) Prof. Melanie Leng (British Geological Survey)

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