Main research activities

My contribution to scientific research concerns the climate / biogeochemical cycles feedbacks, through studies of the temporal evolution of the atmospheric composition, mainly in terms of trace gases having a radiative impact, using ice cores and interstitial air in polar firn.


I mostly worked on the reconstruction and interpretation of temporal trends for mixing ratios and some isotopic ratios of greenhouse gases, such as methane (CH4), carbon dioxide (CO2), nitrous oxide (N2O) and some organo-halogenated compounds. But also carbon monoxide (CO) which plays a major role on atmospheric chemistry. In another field of research, I have initiated the use of global changes in atmospheric CH4 as a chronological constraints on the dynamics of past climate, or to constrain glacio-climatic parameters (temperature, accumulation, gas age-ice age difference).


My research activity is dominated by instrumental and analytical work, including for instant the set-up and development of isotope geochemistry at LGGE. About 10 years ago, I also launched the application of new laser optical spectroscopy techniques on trace-gas analyses in ice cores.


I also contributed to modelling activities, with essentially a new major theme every 10 years. I started with modelling methane sources at different time scales. Then I contributed to a specific approach on the spatial distribution of wetlands. More recently I contributed to the use of a model of intermediate complexity to evaluate the role played by permafrost on the carbon cycle during different times.


The main breakthroughs that one could extract from this activity are in my opinion :





In terms of research management, my involvement largely increased since 2003 (making up to ~50% of my work time) :


Most of my current research time is devoted to the ERC project ICE&LASERS that I lead since 2012.