Ph.D scholarship in “Modelling land surface fluxes of CO2 in response to climate variation and nitrogen deposition”

GESS - the Graduate Programme in Environmental Stress Studies - is offering a Ph.D. scholarship to be affiliated with the Department of Environmental, Social and Spatial Change (ENSPAC), Roskilde University. The ph.d. is partly funded by the Strategic Research Council as it is part of a larger national project (ECOCLIM) coordinated by the Atmospheric Department of the National Environmental Research Institute (NERI), Aarhus University. The scholarship is for a period of 3 years and shall be filled as soon as possible, within the area

Modelling land surface fluxes of CO2
in response to climate variation and nitrogen deposition

Climate change, nutrient availability and impacts of nitrogen deposition represent uncertainties for the prediction of future greenhouse gas exchange as the mechanisms describing nutritional effects are not well developed in climate and ecosystems models. The purpose of this PhD project is to develop a land surface canopy model capable of simulating atmospheric CO2 fluxes of (Danish) agricultural and forest canopies and their sensitivity to variations in climate and nitrogen deposition rates. For this purpose, the PhD project aims at combining a biophysically based canopy photosynthesis-stomatal conductance model (ie. Collatz model) and an ammonia compensation point model. Such an integrated model system will allow more realistic estimation of the nitrogen deposition velocity, and the impact of nutrient (nitrogen) availability on CO2 fluxes can be represented in terms of leaf photosynthetic capacity. The model system will be used to predict the response of canopy CO2 fluxes to variations in climate and nitrogen deposition.

The PhD project aims at theoretical model development, however some experimental field work must be envisaged. The photosynthesis-stomatal conductance model is expected to work using standard model parameters, whereas a literature survey is initially required for the development and parameterization of the ammonia compensation point model for different vegetation types. Model development will be supported by field (vegetation) measurements such as leaf area index, leaf nitrogen and stomatal conductance data at selected sites, and atmospheric flux measurements of CO2 and NH3 of a beech forest will be used to evaluate the model approach. For agricultural fields, model parameterization will consider fertilizer inputs and N cycle dynamics of typical Danish soil and crop types, as simulated by the Danish agro/ecosystem model Daisy. The project will take place within the framework of the ECOCLIM project (“Ecosystems Surface Exchange of Greenhouse Gases in an Environment of Changing Anthropogenic and Climate forcing”) and in close collaboration with the Atmospheric Department of NERI, Aarhus University. To ensure an international dimension of the research, the he Phd project includes ½ year research visit to an international research institution.

The successful candidate should have a natural scientific background with experience regarding land surface-atmosphere interactions, atmospheric modeling and/or ecosystem modelling. Experience with field work will also be an advantage. Furthermore it is recommended that the candidate has a good flair regarding the implementation of science in regulation, and an understanding of the use of models in science/regulation.
Further information can be obtained by contacting Ph.d. Secretary Jytte Bach, tlf. 46 74 21 43, email: jyb@ruc.dk or GESS Director, Assoc. Prof. Henriette Selck, tlf. 46 74 29 83, email: selck@ruc.dk or Assoc. Prof. Eva Bøgh, tlf 46 74 39 40, email: eboegh@ruc.dk.

Successful candidates will be enrolled in the Graduate Programme in Environmental Stress Studies (GESS) in accordance with the rules issued by the Ministry of Technology and Science and additional regulations issued by Roskilde University. They will be employed in accordance with the agreement between the Ministry of Finance and AC (the Danish confederation of Professional Associations). Candidates receiving GESS scholarships are automatically registered in the school. They are expected to participate actively in relevant courses, seminars and other activities arranged by GESS.

The application should include:
  • Project description of 4-6 pages
  • A time plan
  • Candidate certificate
  • Curriculum vitae
  • Letters of recommendation
Original post http://www.ruc.dk/job/phd

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