Max Planck Gesellschaft

Jürgen Knauer

PhD student in the Terrestrial Biosphere Modelling Group
room: C3.017
phone: +49 3641 576234
email: jknauer(at)bgc-jena.mpg.de

professional background | my work at BG | Research interests | Software | Publications


Professional background

I have studied B.Sc. in Geography and Biology at the LMU Munich, Germany and M.Sc. in Global Change Ecology at the University of Bayreuth, Germany.


My PhD topic

My PhD topic is entitled "Modelling the interactions of ecosystem water and carbon fluxes across a global climate gradient". In particular, I work on the following topics:

  • Ecosystem water use efficiency and response to climate change
  • Estimating (physiologically controlled) water-use efficiency from eddy covariance data
  • Role of leaf internal (mesophyll) conductance in terrestrial carbon uptake and water use efficiency

Research Interests:

  • Representation of eco-physiological processes in land surface models and their feedbacks with the physical environment
  • Derivation of ecosystem physiological quantities from FLUXNET data
  • Response of water use efficiency to rising atmospheric CO2 and climate change
  • Modeling mesophyll conductance in the land surface model JSBACH + its effect on future vegetation carbon uptake

Software

I am developer and maintainer of the R package bigleaf, a toolset for the derivation of physical and physiological ecosystem properties from eddy covariance data.


Publications

Knauer, J., El-Madany, T.S., Zaehle, S., Migliavacca, M. (2018): Bigleaf—An R package for the calculation of physical and physiological ecosystem properties from eddy covariance data. PLOS ONE, 13(8), e0201114. doi.org/10.1371/journal.pone.0201114.

Wutzler, T., Lucas-Moffat, A., Migliavacca, M., Knauer, J., Sickel, K., Šigut, L., Menzer, O., Reichstein, M. (2018): Basic and extensible post-processing of eddy covariance flux data with REddyProc. Biogeosciences, 15, 5015-5030. doi.org/10.5194/bg-15-5015-2018.

Schaphoff, S., von Bloh, W., Rammig, A., Thonicke, K., Biemans, H., Forkel, M., Gerten, D., Heinke, J., Jägermeyr, J., Knauer, J., Langerwisch, F., Lucht, W., Müller, C., Rolinski, S., Waha, K. (2018): LPJmL4 – a dynamic global vegetation model with managed land – Part 1: Model description. Geoscientific Model Development, 11, 1343-1375. doi:10.5194/gmd-11-1343-2018.

Schaphoff, S., Forkel, M., Müller, C., Knauer, J., von Bloh, W., Gerten, D., Jägermeyr, J., Lucht, W., Rammig, A., Thonicke, K., Waha, K. (2018): LPJmL4 – a dynamic global vegetation model with managed land – Part 2: Model evaluation. Geoscientific Model Development, 11, 1377-1403. doi:10.5194/gmd-11-1377-2018.

Knauer, J., Zaehle, S., Medlyn, B.E., Reichstein, M., Williams, C.A., Migliavacca, M., De Kauwe, M.G., Werner, C., Keitel, C., Kolari, P., Limousin, J-M., Linderson, M-L. (2018): Towards physiologically meaningful water-use efficiency estimates from eddy covariance data. Global Change Biology, 24, 694–710. doi:10.1111/gcb.13893.

Medlyn, B.E., De Kauwe, M.G., Lin, Y-S., Knauer, J., Duursma, R.A., Williams, C.A., Arneth, A., Clement, R., Isaac, P., Limousin, J-M., Linderson, M-L., Meir, P., Martin-StPaul, N., Wingate, L. (2017): How do leaf and ecosytem measures of water-use efficiency compare? New Phytologist, 216, 758–770. doi:10.1111/nph.14626.

De Kauwe, M.G., Medlyn, B.E., Knauer, J., Williams, C.A. (2017): Ideas and perspectives: how coupled is the vegetation to the boundary layer? Biogeosciences, 14, 4435–4453. doi:10.5194/bg-14-4435-2017.

Knauer, J., Zaehle, S., Reichstein, M., Medlyn, B.E., Forkel, M., Hagemann, S., Werner, C. (2017): The response of ecosystem water-use efficiency to rising atmospheric CO2 concentrations: sensitivity and large-scale biogeochemical implications. New Phytologist, 213, 1654–1666. doi:10.1111/nph.14288.

Knauer, J., Werner C., Zaehle, S. (2015): Evaluating stomatal models and their atmospheric drought response in a land surface scheme: A multibiome analysis. J. Geophys. Res. Biogeosci., 120, 1894–1911. doi:10.1002/2015JG003114.

Arnold, S., Kailichova, Y., Knauer, J., Ruthsatz, A. D., Baumgartl, T. (2014): Effects of soil water potential on germination of co-dominant Brigalow species: Implications for rehabilitation of water-limited ecosystems in the Brigalow Belt bioregion. Ecological Engineering, 70, 35-42. doi:10.1016/j.ecoleng.2014.04.015.

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