The department of Ocean Systems (OCS) is looking for an enthusiastic and motivated Postdoc candidate to work on rapid climate changes in the past using novel statistical tools. We are looking for a candidate with either a background in paleoceanography/paleoclimatology and a keen interest in novel statistical tools or, alternatively, a candidate with a background in statistics/mathematics and a keen interest in paleoceanography/paleoclimatology. This position is part of a larger project designed to use the sediment record as archive to assess whether an Earth system has a tipping point, determine processes involved, and elucidate whether we can forecast tipping points. The project is part of the Vidi Talent Programme scheme funded by NWO awarded to Dr Rick Hennekam. The position is offered for a period of 24 months, working in close collaboration with other experts at NIOZ, GFZ Potsdam, Wageningen University, Waterloo University, and McGill University.
ROYAL NIOZ
NWO-NIOZ Royal Netherlands Institute for Sea Research is the Dutch national oceanographic institute and principally performs academically excellent multidisciplinary, fundamental, and frontier applied marine research addressing important scientific and societal questions pertinent to the functioning of the ocean and seas. NIOZ includes the National Marine research Facilities (NMF) department that operates a fleet of research vessels and the national pool of large seagoing equipment, and supports excellence in multidisciplinary marine research, education, and policy development.
THE DEPARTMENT
Researchers in the Department of Ocean Systems (OCS) study open-ocean processes from a variety of disciplines including physical and chemical oceanography, marine geology, paleoceanography and deep-sea ecology. We investigate the past and present ocean in order to assess its future role in the Earth system. We collect data during oceanographic research cruises and conduct experiments both at sea and in the laboratory at our home base on Texel. The department carries out work in diverse environments all around the globe, from the Antarctic to the Arctic, and from the Caribbean to the North Sea.
THE PROJECT
Abrupt and irreversible changes, known as tipping points, in Earth's systems are a growing concern for scientists, policymakers, and the general public. Several components of our planet may cross these thresholds due to human activities leading, e.g., to sudden polar ice loss, swift changes in ocean circulation, or abrupt oxygen loss in ocean areas. Predicting such responses is crucial to mitigate sudden, unwanted effects on humanity. However, we often lack the observational time series needed to determine whether Earth's systems contain tipping points.
To address this knowledge gap, the NWO-funded Vidi project ‘TIP-TOP’ aims to use sediment records as archives to assess whether an Earth system has a tipping point, determine the processes involved, and elucidate whether we can forecast these tipping points. We will develop and apply a novel approach on new and existing sedimentary paleo-records to identify potential tipping-point behavior in such systems. This will enable more accurate predictions of these systems' responses and provide a general approach to improve tipping-point risk assessments for other Earth systems using sediments.
The postdoc position will primarily focus on the statistical tools to better understand and predict tipping points. The project is led by NIOZ, with partners from Wageningen University, ETH Zürich, GFZ Potsdam, Waterloo University, and McGill University.
THE POSITION
Your role in the TIP-TOP project will involve applying and developing new statistical tools to forecast and predict tipping-point behavior in Earth systems using sediment records. You will collaborate with leading experts in the mathematics of tipping points from Wageningen University, Waterloo University, and McGill University. This collaboration will help you gain knowledge in statistical approaches, including machine learning, to understand abrupt and complex system responses from paleo records.
Specifically, you will apply these tools to reconstructed high-resolution paleo-records of Mediterranean marine (de)oxygenation and North African ecosystem changes, which are part of another work package in the TIP-TOP project. Some of this sediment material still needs to be retrieved, so if the starting date permits, you can likely join an already scheduled research expedition with the Dutch research vessel R/V Pelagia in February 2025 to collect sediment cores near NW Africa. In collaboration with partners (e.g., from Utrecht University) we also aim to model these system responses to better understand the underlying processes.
You will lead and contribute to peer-reviewed publications, share your results online with the research community, as well as present the project results at international conferences, while also actively working together with a PhD student whose project focuses on high-resolution reconstruction of abrupt climatic changes.
