I am particularly interested in determining the role of marine plankton and nutrients on the carbon cycle for the modern, past and future climate. I develop models of diverse complexity, from Earth-System models to complex ecosystem models and machine-learning predictive models combining process-based understanding with observations.

Recent projects have focused on understanding the controlling mechanisms for the ecology of diatom and calcifiers, the marine ecosystem climatic impact, marine nitrogen fixation and the spread of anoxic conditions during the Oceanic Anoxic Events of the Cretaceous.

• Exploring diatom diversity on the carbon cycle: I look at the effect of diatom size and density on the ocean carbon storage.  
• Diversity of coccolithophores: I test different ecological trade-offs for a diverse population of coccolithophores to analyse the causes and consequences of diversity and calcification on the carbon cycle and climate in the global ocean. I have recently started using machine learning approaches to determine the key species and traits driving coccolithophore ecology and develop the trait-based model Darwin to incorporate diverse coccolithophore groups.
• Cretaceous Oceanic Anoxic Events (OAEs): I analyse the interactions between the nutrient cycles (phosphorus, nitrogen and iron), climate and the cycling of carbon, oxygen and sulphur in an Earth System model (GENIE). In doing so, I evaluated the sensitivity of marine biogeochemistry to warming, increased stratification and decreased dissolved oxygen concentration.
• Marine nitrogen cycle: I investigate how the marine nitrogen cycle (including nitrogen fixation, denitrification and nitrification) can regulate marine productivity and thus climate for modern (using MITgcm) and past climates (using GENIE).
• Diversity of nitrogen fixers: Using a self-assembling ecosystem model (Darwin project), I reconstruct a diverse population of nitrogen fixers of the modern ocean to assess the impact of diversity on the nitrogen cycle and climate.