If you made any changes in Pure these will be visible here soon.

Personal profile

Research interests

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 Fingerprint is based on mining the text of the person's scientific documents to create an index of weighted terms, which defines the key subjects of each individual researcher.

marine isotope stage Earth & Environmental Sciences
Holocene Earth & Environmental Sciences
bottom water Earth & Environmental Sciences
sediment core Earth & Environmental Sciences
seawater Earth & Environmental Sciences
interglacial Earth & Environmental Sciences
North Atlantic Deep Water 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 2018

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
File
Seawater
Oxygen
Water
Ice
Proxy

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 othersSikes, 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
calibration
biological pump
dissolved inorganic carbon

Erratum: Oxygen depletion recorded in upper waters of the glacial Southern Ocean

Lu, Z., Hoogakker, B. A. A., Hillenbrand, C. D., Zhou, X., Thomas, E., Gutchness, K. M., Lu, W., Jones, L. & Rickaby, R. E. M., 26 Apr 2016, In : Nature Communications. 7, 11531.

Research output: Contribution to journalComment/debate

Open Access

Expanded oxygen minimum zones during the late Paleocene-early Eocene: Hints from multiproxy comparison and ocean modeling

Zhou, X., Thomas, E., Winguth, A. M. E., Ridgwell, A., Scher, H., Hoogakker, B. A. A., Rickaby, R. E. M. & Lu, Z., 1 Dec 2016, In : Paleoceanography. 31, 12, p. 1532-1546 15 p.

Research output: Contribution to journalArticle

Open Access
Paleocene
oxygenation
Eocene
bottom water
oxygen

Millennial changes in North Atlantic oxygen concentrations

Hoogakker, B. A. A., Thornalley, D. J. R. & Barker, S., 15 Jan 2016, In : Biogeosciences. 13, 1, p. 211-221 11 p.

Research output: Contribution to journalArticle

Open Access
File
bottom water
oxygen
water
oceans
Ocean Drilling Program

Prizes

Philip Leverhulme Prize 2018

Babette Hoogakker (Recipient), 13 Mar 2019

Prize: Prize (including medals and awards)

Earth science