PhD position on Modelling of Ocean Alkalinity Dynamics

Want to advance our capabilities to predict the ocean’s future carbon uptake capacity? Join us to elucidate and model ocean alkalinity dynamics.The Department of Earth Sciences is looking for a highly motivated PhD candidate with an MSc background in Earth Sciences, Oceanography, Climate Sciences or other appropriate fields. You will work on the project ‘Ocean Alkalinity Dynamics’.Your jobOcean alkalinity plays a major role in ocean’s carbon uptake, in buffering, and in calcium carbonate production and dissolution, and it impacts and is affected by various biogeochemical processes. The processes governing ocean alkalinity act over multiple timescales (from instantaneous chemical equilibration to hundred thousand of years) and involve physical, chemical and biological processes.  Alkalinity dynamics is poorly understood and represented in present-day generation of earth system models.In this four-year study under guidance of Profs. Jack Middelburg and Henk Dijkstra, you will elucidate ocean alkalinity dynamics and develop new and improve existing models for ocean carbon cycling. The initial focus is on the alkalinity generation and consumption processes at the annual to decadal timescale and their importance for future ocean carbon update, but we invite you to share your ideas and suggestions for this innovative project in your motivation letter.This project is part of the 10-year EMBRACER research programme funded by the Dutch Research Council (NWO). At EMBRACER, we work at the very frontiers of knowledge on climate change, Earth’s climate system and climate feedbacks. The programme brings together a wide range of world-leading climate experts with the aim to address existing uncertainties about climate feedbacks at the boundaries between oceans, land, ice, and atmosphere. Our interdisciplinary approach and state-of-the-art infrastructure will bring us forward in our understanding of the impact of climate feedbacks emerging over the next decades to centuries.A personalised training programme will be set up, reflecting your training needs and career objectives. About 20% of your time will be dedicated to this training component, which includes following courses/workshops as well as training on the job in assisting in the Bachelor’s and Master’s programmes of the department at Utrecht University.Your qualitiesYou are an independent, highly motivated team player, having experience in numerical modelling, and have completed your MSc degree in Earth Sciences, Oceanography, Climate Sciences or a related discipline by the time the position starts. Furthermore, you have:

• strong and demonstrable skills in transport-reaction, ocean circulation or Earth System model(s) (shown by a relevant master research project experience or course study);
• a theoretical background and an interest in ocean biogeochemistry;
• strong analytical skills;
• excitement to explore a new research area;
• motivation to cooperate in a diverse and multidisciplinary research team;
• excellent communication skills.

Good command of Python or a similar programming language is essential. Due to the international character of our research, proficiency in spoken and written English is also essential.We highly encourage applicants from all members of our community and of diverse backgrounds to join us.Our offerWe offer:

• a fulltime position for 1 year, with an extension to a total of four years upon a successful assessment in the first year, and with the specific intent that it results in a doctorate within this period;
• a working week of 36 hours and a gross monthly salary between €2.901 and €3.707 (salary scale P under the Collective Labour Agreement for Dutch Universities (CAO NU)); 
• 8% holiday pay and 8.3% year-end bonus; 
• a pension scheme, partially paid parental leave and flexible terms of employment based on the CAO NU. 

In addition to the terms of employment laid down in the CAO NU, Utrecht University has a number of schemes and facilities of its own for employees. This includes schemes facilitating professional development, leave schemes and schemes for sports and cultural activities, as well as discounts on software and other IT products. We also offer access to additional employee benefits through our Terms of Employment Options Model. In this way, we encourage our employees to continue to invest in their growth. For more information, please visit Working at Utrecht University.About usA better future for everyone. This ambition motivates our scientists in executing their leading research and inspiring teaching. At Utrecht University, the various disciplines collaborate intensively towards major strategic themes. Our focus is on Dynamics of Youth, Institutions for Open Societies, Life Sciences and Pathways to Sustainability. Sharing science, shaping tomorrow.Utrecht University’s Faculty of Geosciences studies the Earth: from the Earth’s core to its surface, including man’s spatial and material utilisation of the Earth – always with a focus on sustainability and innovation. With 3,400 students (BSc and MSc) and 720 staff, the faculty is a strong and challenging organisation. The Faculty of Geosciences is organised in four Departments: Earth Sciences, Human Geography & Spatial Planning, Physical Geography, and Sustainable Development.The Department of Earth Sciences conducts teaching and research across the full range of the solid Earth and environmental Earth sciences, with activities in almost all areas of geology, geochemistry, geophysics, biogeology and hydrogeology. Our key research themes are Earth & Planetary Processes, Sustainable Use of the Subsurface, Planetary Health & Environment, and Climate & Life. The department hosts a highly international tenured staff of over 50 scientists and more than 110 PhD students and postdoctoral researchers. We house or have access to a wide variety of world-class laboratories, among which are UU’s Electron Microscopy Centre, the Geolab, and the Earth Simulation Lab. We also have excellent High- Performance Computing facilities. About UtrechtThe department and its facilities are located at Utrecht Science Park. Utrecht is the fourth largest city in the Netherlands with a population of nearly 360,000 and forms a hub in the middle of the country. Its historical city centre and its modern central station can easily be reached from the Science Park by public transport or by a 15-minute bicycle ride. Utrecht boasts beautiful canals with extraordinary wharf cellars housing cafés and terraces by the water, as well as a broad variety of shops and boutiques.More informationFor informal information (not for application) about this position, please contact Prof. Jack Middelburg at j.b.m.middelburg@uu.nl.Candidates for this vacancy will be recruited by Utrecht University.Apply nowAs Utrecht University, we want to be a home for everyone. We value staff with diverse backgrounds, perspectives and identities, including cultural, religious or ethnic background, gender, sexual orientation, disability or age. We strive to create a safe and inclusive environment in which everyone can flourish and contribute.You can only apply via our online procedure using the 'apply now' button. E-mail applications cannot be accepted. Include the following information in your application:

• your curriculum vitae, including (1) any courses taken that are relevant for the position, and (2) model(s) and programming language(s) you used during your study;
• academic credentials (mark sheets and degree statements);
• a letter of motivation.

No reference letters need to be submitted in your initial application. If you are short-listed, we will contact you for referees. We aim for a quick selection procedure after the application deadline of August 30th. The preferred starting date is late autumn 2025 or as soon as possible thereafter.Note that international candidates that need a visa/work permit for the Netherlands require at least four months processing time after selection and acceptance. This will be arranged with help of the International Service Desk (ISD) of our university. Finding appropriate housing in or near Utrecht is your own responsibility, but the ISD may be able to advise you therewith. In case of general questions about working and living in The Netherlands, please consult the Dutch Mobility Portal.Online screening may be part of the selection. Commercial response to this ad is not appreciated.