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