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Personal profile

Research interests

UKRI Future Leaders Fellow 'Fate of ocean oxygenation in a warming world'

My research interests are in the application and interpretation of foraminiferal isotope and trace metals and flow vigour proxies, to study the interaction between the biogeochemical cycles, large-scale ocean circulation and climate change in the past. My current projects focus on the development and application of proxy methods to reconstruct oxygen concentrations of seawater in the geological past. Since the 1960s the oceans have lost ~2% of their oxygen, a trend expected to accelerate in relation with global warming. Future deoxygenation, along with overfishing, threatens the sustainability of economically important fisheries and marine ecosystems and will impact global biogeochemical cycles. However, predictions of the future are hampered by a poor understanding of the longer-term natural oxygen cycle. Application of proxy methods to reconstruct oxygen concentrations in the past gives us an opportunity to extend our knowledge of the longer term oxygen cycle, and help improve predictions of future oxygen level changes.

The material we use to develop proxy methods and past time-series involves the shells of microorganisms called foraminifera. Some species float near the ocean surface, called planktonic foraminifera, and can be used to assess the presence of subsurface oxygen minimum zones, seawater temperatures, etc. Species that live on or in sediments at the bottom of the ocean are termed benthic foraminifera and can be used to reconstruct bottom water oxygen concentrations and ventilation. I have been extracting foraminifera from sediments from the International Ocean Discovery Program to determine if there have been changes in the natural extent and intensity of the Atlantic Ocean, the shallow Pacific Ocean OMZ oxygen minimum (or 'dead') zones (e.g. areas where oxygen levels are too low to support aerobic life) over the last glacial-interglacial cycle (e.g. last ca. 130,000 years).

As part of future research we will look at utilizing organic carbon in foraminifera to understand past ocean productivity, carbon cycling and climate change.

External positions

University of Oxford

1 Dec 201630 Sep 2018

Fingerprint Dive into the research topics where Babette Hoogakker is active. These topic labels come from the works of this person. Together they form a unique fingerprint.

marine isotope stage Earth & Environmental Sciences
bottom water Earth & Environmental Sciences
Holocene Earth & Environmental Sciences
oxygen Earth & Environmental Sciences
benthic foraminifera Earth & Environmental Sciences
sediment core Earth & Environmental Sciences
seawater Earth & Environmental Sciences
water mass Earth & Environmental Sciences

Co Author Network Recent external collaboration on country level. Dive into details by clicking on the dots.

Research Output 2003 2020

I/Ca in epifaunal benthic foraminifera: A semi-quantitative proxy for bottom water oxygen in a multi-proxy compilation for glacial ocean deoxygenation

Lu, W., Rickaby, R. E. M., Hoogakker, B. A. A., Rathburn, A. E., Burkett, A. M., Dickson, A. J., Martínez-Méndez, G., Hillenbrand, C-D., Zhou, X., Thomas, E. & Lu, Z., 13 Jan 2020, In : Earth and Planetary Science Letters. 533, 116055.

Research output: Contribution to journalArticle

benthic foraminifera
bottom water

Early Cenozoic Decoupling of Climate and Carbonate Compensation Depth Trends

Greene, S. E., Ridgwell, A., Kirtland Turner, S., Schmidt, D. N., Pälike, H., Thomas, E., Greene, L. K. & Hoogakker, B. A. A., Jun 2019, In : Paleoceanography and Paleoclimatology. 34, 6, p. 930-945 16 p.

Research output: Contribution to journalArticle

Open Access
weathering rate

Global sea-surface iodide observations, 1967-2018

Chance, R. J., Tinel, L., Sherwen, T., Baker, A. R., Bell, T., Brindle, J., Campos, M. L. A. M., Croot, P., Ducklow, H., Peng, H., Hopkins, F., Hoogakker, B., Hughes, C., Jickells, T. D., Loades, D., Macaya, D. A. R., Mahajan, A. S., Malin, G., Phillips, D., Roberts, I. & 9 others, Roy, R., Sarkar, A., Sinha, A. K., Song, X., Winkelbauer, H., Wuttig, K., Yang, M., Peng, Z. & Carpenter, L. J., 26 Nov 2019, In : Scientific Data. 6, 286.

Research output: Contribution to journalArticle

Open Access
Oceans and Seas

Glacial expansion of oxygen-depleted seawater in the eastern tropical Pacific

Hoogakker, B. A. A., Lu, Z., Umling, N., Jones, L., Zhou, X., Rickaby, R. E. M., Thunell, R., Cartapanis, O. & Galbraith, E., 17 Oct 2018, In : Nature. 562, 7727, p. 410-413 4 p.

Research output: Contribution to journalLetter

Open Access

Calibration of the carbon isotope composition (δ13C) of benthic foraminifera

Schmittner, A., Bostock, H. C., Cartapanis, O., Curry, W. B., Filipsson, H. L., Galbraith, E. D., Gottschalk, J., Herguera, J. C., Hoogakker, B., Jaccard, S. L., Lisiecki, L. E., Lund, D. C., Martínez-Méndez, G., Lynch-Stieglitz, J., Mackensen, A., Michel, E., Mix, A. C., Oppo, D. W., Peterson, C. D., Repschläger, J. & 3 others, Sikes, E. L., Spero, H. J. & Waelbroeck, C., Jun 2017, In : Paleoceanography. 32, 6, p. 512-530 19 p.

Research output: Contribution to journalArticle

benthic foraminifera
carbon isotope
biological pump
dissolved inorganic carbon


Philip Leverhulme Prize 2018

Babette Hoogakker (Recipient), 13 Mar 2019

Prize: Prize (including medals and awards)

Earth science

Activities 2017 2017

  • 1 Membership of peer review panel

Natural Environment Research Council (External organisation)

Babette Hoogakker (Member)
2017 → …

Activity: MembershipMembership of peer review panel