Johannes Meyerholt

PhD student
room: C3.002b
phone: +49.3641.57.6262
email: jmeyer(at)

Research interests

The focus of my current research is the assessment of uncertainty in terrestrial coupled carbon-nitrogen-cycle models. I aim to identify key processes such as plant nitrogen uptake, flexibility in stoichiometry, denitrification etc., investigate their varying formulations and parametrizations, and evaluate these alternative approaches regarding their performance in comparison with observational data. I plan on implementing the different formulations and parametrizations into a common framework and examining the model's sensitivity to pertubations of driving climatic and biogeochemical factors. Ultimately, I am looking to apply these findings to run simulations that assess the overall impact of nitrogen cycle uncertainties on global carbon-cycle climate feedbacks, especially regarding the effects of nitrogen availability on carbon sequestration.

My thesis work is supported by

Education & Research Experience

Max Planck Institute for Biogeochemistry, Jena, Germany (MPI-BGC)

Ph.D. in Geosciences, 2012-

Thesis title: "Systematic assessment of uncertainty in coupled carbon-nitrogen cycle models and their climate feedbacks"

Thesis advisors:

  • Sönke Zaehle, Department for Biogeochemical Integration, MPI-BGC
  • Matthew J. Smith, Computational Science Laboratory, Microsoft Research Cambridge, UK
  • Thomas Hickler, Senckenberg Biodiversity and Climate Research Centre (BiK-F) & University of Frankfurt, Frankfurt, Germany

Microsoft Research Cambridge, UK

Research Intern, Computational Ecology and Environmental Science Group, Sep-Nov 2014

Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Germany

M.Sc. in Marine Environmental Science, 2009-2011

Thesis title: "Modelling resource competition in coupled heterogeneous patches" ; Thesis advisors: Bernd Blasius, Alexey Ryabov, Mathematical Modelling Group

B.Sc. in Environmental Science, 2006-2009

Thesis title: "Phytoplankton competition in a water column: Data analysis and modelling" ; Thesis advisors: Bernd Blasius, Alexey Ryabov, Mathematical Modelling Group


Microsoft Research PhD Scholarship, 2012-2015

Peer-reviewed publications:

Meyerholt, J. & Zaehle, S. (2015) The role of stoichiometric flexibility in modelling forest ecosystem responses to nitrogen fertilization. New Phytologist 208(4), 1042-1055, doi: 10.1111/nph.13547.