PhD Position in Tropical Organic Geochemistry: Modern and Ancient Microbial Drivers of Biogeochemical Cycling

PhD Position in Tropical Organic Geochemistry: Modern and Ancient Microbial Drivers of Biogeochemical Cycling

100%, Zurich, fixed-term

We are seeking a highly motivated PhD student for a multidisciplinary project spanning two groups: (i) The Surface Earth Evolution (SEE) group in the Department of Earth and Planetary Sciences at ETH Zurich, which investigates the processes that drive global climate change over human to geological timescales; and (ii) The Sustainable Agroecosystems (SAE) group in the Department of Environmental Systems Science at ETH Zurich, dedicated to ensuring healthy food supply from fields to tables for generations to come. Our collaborative efforts intertwine traditional Earth and environmental sciences, allowing us to thoroughly study the drivers and impacts of climate change and land use. We effectively integrate field-based sample collection and monitoring with laboratory-based biogeochemical measurements.

Project Background

This position is part of the SNSF-funded project titled Constraining tropical wetland greenhouse gas production today and through time: insights from Tumba-Ngiri-Maindombe, Democratic Republic of Congo (LacMai). The project aims to mechanistically understand the climatic and anthropogenic controls on greenhouse gas emissions (i.e., carbon dioxide, methane, and nitrous oxide) in Tumba-Ngiri-Maindombe, which is home to the world’s largest tropical wetland but remains largely understudied. Our approach includes sampling greenhouse gases, peatland soils, and lake sediments, followed by analysis using isotopes, biomarkers, and DNA-based methods.

The selected PhD student will lead the biomarker component of this interdisciplinary project, employing state-of-the-art organic geochemical techniques to identify and reconstruct the responses of biogeochemical cycles and microbial communities to climatic shifts over the past 12,000 years (the Holocene).

Job Description

• Perform Fieldwork: Participate in sampling expeditions to DR Congo, collecting high-resolution, pristine sediment records from Lake Mai Ndombe and adjacent peatlands while ensuring proper preservation for organic geochemical analyses.
• Describe Sediments: Collaborate with ETH's cutting-edge radiocarbon facility to build lake sediment and peat core age models, interpreting how sediment sources and accumulation rates have evolved over the Holocene.
• Reconstruct Ecosystems: Utilize ancient pollen and charcoal signals preserved in sediments to determine historic climate and landscape vegetation changes.
• Analyze Biomarkers: Extract and quantify sedimentary biomarkers indicative of specific greenhouse gas-producing and -consuming microorganisms, reconstructing how greenhouse gas cycling has evolved over time.
• Communicate Findings: Attend international conferences and workshops while writing scientific papers to share your research outcomes.

This position is integral to our research team, which comprises two PhD students, two senior scientists, and several technicians across both research groups. You will lead these tasks while receiving support from all involved PIs and researchers. This multidisciplinary environment presents a unique opportunity to learn, develop, and apply scientific skills beyond traditional organic geochemistry.

Profile

• Education: A Master's degree in geochemistry, geology, or a related field.
• Wet-lab Experience: Familiarity with geochemical and/or sedimentological techniques (e.g., organic or inorganic isotope analysis); prior experience with biomarkers or in a controlled laboratory environment is advantageous.
• Computational Skills: Experience with data reduction and analysis techniques (e.g., statistical methods, numerical models) is highly desirable.
• Remote Fieldwork: Willingness to conduct fieldwork in a remote tropical environment.
• Communication: Proficient in written and spoken English with the ability to communicate effectively in a cross-cultural environment. Knowledge of French is a plus (for fieldwork).
• Personal Attributes: Ability to work independently with flexibility, critical thinking, and a willingness to learn new skills.

Workplace

We offer an excellent, inclusive working environment, a strong international network, and an internationally competitive salary (paid according to ETH standards).

We Value Diversity and Sustainability

ETH Zurich is committed to promoting an inclusive culture. We value equal opportunity and diversity, fostering a working and learning environment that respects the rights and dignity of all staff and students. Sustainability is a core value for us as we continuously strive towards a climate-neutral future.

Curious? So Are We.

Apply online using the form below. Only applications matching the job profile will be considered.

We look forward to your application!

For any inquiries regarding the position, please contact Prof. Jordon D. Hemingway at jordon.hemingway@eaps.ethz.ch.

About ETH Zurich

ETH Zurich is a world-leading university specializing in science and technology, recognized for its excellent education, groundbreaking research, and the direct application of new knowledge into society. With over 30,000 individuals from more than 120 countries, our university promotes independent thinking and inspires excellence. Located in the heart of Europe and fostering global connections, we collaborate on developing solutions for today’s and tomorrow’s global challenges.