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"
- 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
Meyerholt, J. , Zaehle, S. & Smith, M. J. (2016) Variability of projected terrestrial biosphere responses to elevated levels of atmospheric CO2 due to uncertainty in biological nitrogen fixation. Biogeosciences 13, 1491-1518, doi: 10.5194/bg-13-1491-2016.
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.
Variability of projected terrestrial biosphere responses to elevated levels of atmospheric CO2 due to uncertainty in biological nitrogen fixation . AGU Fall Meeting, Dec 14-18 2015, San Francisco, CA, USA.
Systematic Assessment of Uncertainty in Coupled Carbon-Nitrogen Cycle Models and their Climate Feedbacks . European research course on Atmospheres (ERCA), Jan 7 - Feb 8 2013, Grenobles, France.