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Utrecht University

Postdoc in Ocean Acidification and the Marine Phosphorus Cycle Utrecht University in Netherlands

Degree Level

Postdoc

Field of study

Geology

Funding

Postdoctoral position for 36 months at 1.0 FTE. Gross monthly salary is between €3,706 and €5,760 (salary scale 10 under the Dutch CAO NU, based on a 38-hour working week), plus 8% holiday pay, 8.3% year-end bonus, pension scheme, partially paid parental leave, flexible employment terms, and additional benefits.

Deadline

Oct 31, 2026

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Country

Netherlands

University

Utrecht University

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Keywords

Geology
Chemistry
Environmental Science
Biology
Earth Science
Biogeochemistry

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About this position

Postdoc opportunity at Utrecht University in ocean acidification and the marine phosphorus cycle. The project, PHOSFLUX, is an NWO-funded collaboration between Utrecht University and NIOZ that investigates how ocean acidification may alter CaCO3 fluxes, phosphorus cycling, ocean fertility, and CO2 uptake.

The postdoctoral researcher will focus on biogeochemical modelling and develop a reactive-transport model for phosphorus dynamics in sinking and deposited marine snow. The work includes processes such as CaCO3 dissolution, organic matter decomposition, and adsorption/incorporation of PO4 into solid phases. The model will be tested against experimental and field data in collaboration with the project PhD student.

The position is based in the Faculty of Geosciences, Department of Earth Sciences at Utrecht University, Netherlands. The team includes Prof. Dr. Mariëtte Wolthers (Utrecht University) and Dr. Peter Kraal (NIOZ). The project combines field work in the North Atlantic Ocean, laboratory experiments, synchrotron-based analyses, and numerical modelling.

Applicants should have completed a PhD in Earth Sciences, Environmental Sciences, Biology, or a related field by the start date. Desired experience includes biogeochemistry, marine research, numerical modelling of mineral-water interactions and/or organic matter degradation, and interest in synchrotron techniques. Strong English, communication, teamwork, and willingness to travel are important.

The appointment is for 36 months at 1.0 FTE, with a gross monthly salary of €3,706–€5,760 plus holiday pay, year-end bonus, pension, and other employment benefits. The deadline is 31 October 2026, and the position can start as soon as possible, no later than 1 January 2027.

Apply through the Utrecht University vacancy page using the online application button. Submit a CV, motivation letter, and the email addresses of at least two referees. Email applications are not accepted.

Funding details

Postdoctoral position for 36 months at 1.0 FTE. Gross monthly salary is between €3,706 and €5,760 (salary scale 10 under the Dutch CAO NU, based on a 38-hour working week), plus 8% holiday pay, 8.3% year-end bonus, pension scheme, partially paid parental leave, flexible employment terms, and additional benefits.

What's required

Applicants must have successfully completed a PhD programme in Earth Sciences, Environmental Sciences, Biology or a related discipline by the time the position starts. Preferred qualifications include experience and affinity with biogeochemistry and marine research, experience in numerical modelling of mineral-water interactions and/or organic matter degradation processes, and experience or strong interest in synchrotron-based analysis techniques. Excellent written and spoken English, good communication skills, strong teamwork, willingness to travel abroad for synchrotron beamtimes, and ability to present research internationally are expected.

How to apply

Apply via the 'apply now' button on the Utrecht University vacancy page. Submit a CV, motivation letter, and the email addresses of at least two referees. Email applications are not accepted.

More information can be found here

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