In brief

Hi there, I’m Jens – a biogeochemist exploring how the ocean takes up and stores carbon. My work combines global CO₂ measurements in seawater with data science and model simulations.

Since 2025, I have been a Research Fellow at the Carbon to Sea initiative, where I coordinate OAEMIP – the first global ocean alkalinity enhancement model intercomparison project – to assess the potential of ocean-based carbon dioxide removal (CDR).

From 2020 to 2025, I was a Postdoc with Nicolas Gruber at ETH Zurich, where I tracked the accumulation of CO2 in the global ocean, and how this drives acidification in the ocean interior. During this time, I also documented an unexpected decline of the ocean carbon sink in 2023 during a record-breaking global marine heatwave. I further coordinated RECCAP2, bringing together over 100 scientists worldwide to better understand the changing ocean carbon sink.

Curious? Let’s dive deeper!