Jorge Martínez-Rey

Early Stage Researcher, CEA


Research Project: Modelling the nitrogen cycle in the ocean

Supervisor: Dr Laurent Bopp (Commissariat a l'Energie Atomique)
Secondary Supervisor: Prof Nicolas Gruber (Eidgenössische Technische Hochschule Zürich)

Project Description

Improve the representation of the marine N cycle in the PISCES ocean biogeochemical model. In particular, implementing a representation of the variability in phytoplankton N to C ratios and investigating how this may affect the response of air-sea C fluxes to climate change.

My research is focused on the current understanding of the marine N-cycle. The complexity of the N-cycle and its links with those of carbon and oxygen portray a beautiful yet challenging topic, from process parameterizations and OGCBMs to isotopic signatures and palaeorecords. Of particular interest in my work are the effects of future marine stressors such as global warming, ocean deoxygenation and ocean acidification on the marine N-cycle in the next hundred years.

The core of my work has been an improved representation of N-cycle processes in global ocean biogeochemical models, mostly on the in-house PISCES model at IPSL in France but also analysing the model output of the CMIP5 ensemble. The large uncertainties on the N-cycle demand not only to explore future projections on short time scales but also to identify the strengths and weaknesses of current OGCBMs in estimating critical processes such as N2O production, N2-fixation and nitrification under higher CO2 concentrations than today.

Selected Publications

  • Coming soon