Post-Doc : Modelling greenhouse gas emission processes...

Modelling greenhouse gas emission processes (CH4 and CO2) by Sphagnum peats; Impact of global change on these emissions and feedbacks on the climate

Secteur d'activité : Recherche et enseignement

Employeur : LSCE/LPC2E

Contact :

Localisation : Paris/Orléans

Description :

Continental bio-geospheres represent the primary source of emission of Greenhouse Gases (GHGs) in the atmosphere: CO2, CH4 and N2O. Feedback on these emissions generated by the climatic changes, the pollution, or the exploitation of these environments are expected but not well quantified. For example, temperature and rainfall changes (water level) could increase carbon destocking soils, which in turn would increase GHG concentrations in the atmosphere. In this context, peatlands are relevant systems to study these feedbacks. Sphagnum peats are the most efficient terrestrial ecosystem as atmospheric carbon sinks. Indeed, these two last centuries, the amount of carbon that has been stored is equivalent to that of the emitted anthropogenic carbon. This storage result of a delicate balance between carbon inputs (CO2 absorbed by photosynthesis) and carbon outputs (CO2 and CH4 production, dissolved and particulate carbon) leading to an accumulation in the soil of organic matter in the form of peat (carbon sinks). Actually, major uncertainties exist about the biogeochemical processes related to the interaction between chemistry cycles (C, N, P, S), the microorganisms, and the redox reactions under climatic change conditions. These processes have to be studied to better understand the vulnerability of this carbon sink face of global change.

This work is part of the key objectives of the French LABEX VOLTAIRE (http://www.univorleans.fr/en/investissements-avenir/voltaire, University of Orléans, OSUC, France) and European H2020 CRESCENDO (https://crescendoproject.eu/, LSCE, Gif-sur-Yvette, France) projects and will be achieved in the framework of the French peatland observatory network (http://www.insu.cnrs.fr/node/3988, SNOTourbières) based in Orléans with regular visits at LSCE. Efforts will be focussed on the understanding of the processes controlling the peatland emissions to the atmosphere and the induced impact on the climate. The ORCHIDEE (continental surface) model will be used with offline climatic forcings. Coupled simulations with the LMDz (atmosphere) and INCA (chemistry) models will be achieved in a second step. These models developed at the IPSL institute (Paris, France) will be used to assess the impact of climate change on emissions from peatlands and feedback of these emissions on the climate.

Profil :

Prior experience in numerical modelling of the wetland emissions is desirable.

A working knowledge of programming languages such as Fortran and data analysis tools such Matlab/IDL is required.

Biogeochemistry knowledge on Sphagnum type peatlands would be also appreciated.

Modelling development (ORCHIDEE) will be performed with the collaboration of ISTO-CNRS-Orléans (Fatima Laggoun-Défarge, Sébastien Gogo) and LSCE-IPSL-CNRS-CEA-University of Saint-Quentin-en-Yvelines (Bertrand Guenet, Philippe Peylin).

Applicants will be expected to show evidence of their potential through letters of recommendation and documentation of their related experience. Applicants should submit a letter of application stating research interests and experience, along with curriculum vitae, and the names of 2 references the contact.