2 PhD positions, paleoceanography/sediment geochemistry - Lausanne, Switzerland

Two full-time PhD positions in Southern Ocean paleoceanography/sediment geochemistry are available at the Institute of Earth Sciences, Faculty of Geosciences and Environment, University of Lausanne, Switzerland.


Expected start date is 1 January 2021 or upon mutual agreement.

Contract length is one year, renewable two + one years, maximum four years.


The Marine and Sediment Biogeochemistry Group (to be constituted in the course of the summer) at the University of Lausanne has openings for two PhD students. The PhD projects, which are part of a recently funded grant from the Swiss National Science Foundation, are dedicated to investigate the causes and effects of changes in Southern Ocean circulation over the late Pleistocene.

(Subproject A): Will involve documenting the consequences of Fe fertilization on marine export production and carbon sequestration in the SW Indian Ocean across the last glacial cycle. Specifically, this project aims to better understand the sensitivity of marine export production in two contrasted environments in the SW Indian sector of the Southern Ocean. In particular, this project will focus on understanding the mechanisms controlling to sequestration of remineralized carbon as a result of changing surface ocean (micro)nutrient availability and ocean circulation using a suite of geochemical methods, including isotope geochemistry (U-Th, Pb and Nd isotope systematics) and sedimentology (sortable silt). The project will be conducted in collaboration with researchers from the University of Bordeaux (Dr. Xavier Crosta) and the Max Planck Institute for Chemistry in Mainz (Dr. Alfredo Martínez-García).

(Subproject B): Will involve constraining past changes in remineralized carbon sequestration in Southern Ocean subsurface water masses across the last glacial cycle. In detail, this project aims to document changes in carbon sequestration in the ocean subsurface in relation to changes in the formation rate of subsurface waters in the Weddell Sea across the last glacial cycle. Specifically, the project aims to constrain the sensitivity of Weddell Sea deep water production to climate and assess the leverage subsurface ocean ventilation bears on the air-sea partitioning of CO2. The project will include the application of novel sediment geochemistry tools, combining U-Th, Pb and Nd isotope systems and the determination of total sedimentary redox capacity. The project will be conducted in collaboration with researchers from GEOMAR, Kiel (Dr. Marcus Gutjahr) and the Alfred Wegener Institut (AWI), Bremerhaven (Dr. Walter Geibert).


Successful candidates should have a strong background in isotope geochemistry and/or paleoceanography/sedimentology, and hold a Master's degree in Earth/Climate Sciences or any related discipline.


- 100% of the engagement will be dedicated to research.
- 15% of the engagement (optional) will be dedicated to teaching assistance in relation to Bachelors and Masters courses in sedimentology or related fields.


The deadline for applications is 15 August 2020.

Please, send your full application in Word or PDF, including (i) a cover letter clarifying your overall motivation for entering a PhD program; (ii) your CV; (iii) transcripts of grades obtained in the Bachelor’s and Master’s degrees; and (iii) the names, telephone numbers, and email addresses of at least two referees.

Apply here: https://career5.successfactors.eu/career?career%5fns=job%5flisting&company=universitdP&navBarLevel=JOB%5fSEARCH&rcm%5fsite%5flocale=en%5fUS&career_job_req_id=15687&selected_lang=en_US&jobAlertController_jobAlertId=&jobAlertController_jobAlertName=&_s.crb=GjZIJLieWsaKtuImwMcC6S2%2ftBBnGTTo04gpbg1MF4Q%3d

Applications will only be accepted via the link above.

Further information

Questions can be emailed to Prof. Samuel Jaccard: This email address is being protected from spambots. You need JavaScript enabled to view it.