I routinely use various numerical models in order to consider and quantify the response of each component of the climate system (ocean, atmosphere, vegetation, marine biomass, land ice…) to the forcing factor studied (please visit the section of the website dedicated to my tools for more details).
In particular, I have been developing 4 main axes of research:
1. Past climate changes: the transition toward ice ages.
During my PhD thesis at LSCE, in particular, I tried to understand the mechanisms responsible for the onset of the Ordovician glaciation (also named “Early Paleozoic Ice Age”). I published the first simulation of the Ordovician ice sheet that is supported by available geological data (see animated gif below).
2. Quantifying the impact of paleogeography on past climate changes.
The paleogeographical changes have profound impacts on the whole climate system. In 2014, I published a paper investigating the impact of the continental configuration and paleogeographical changes on the (in)stability of the Ordovician climate (see Figure below). In this paper, we notably demonstrate a major climatic instability, that allows Ordovician climate to suddenly cool in response to moderate changes in atmospheric forcing. We showed that this climatic instability results from the absence of meridional continental boundaries in the Ordovician Northern Hemisphere. These conditions limit the ocean heat transport to the pole and facilitate the growth of large sea-ice caps.
3. The climatic drivers and feedbacks of neritic carbonate production
During my post-doc at CEREGE, I had the opportunity to work with the sedimentologist Jean Borgomano to investigate the relationships between shallow-water carbonates and climate, both in the Modern and in deep-time periods. We notably developed the first model predicting the spatial occurrence of platform carbonates during the Early Cretaceous (Aptian; 120 Ma). Using an approach combining models and data, we also reconstructed the temporal trend in neritic carbonate production during the Cretaceous and its environmental drivers.
4. The co-evolution of climate and the marine biosphere
I am presently focusing on the co-evolution of marine Life and the environment. Why did marine Life undergo such drastic explosion and diversification during the Early Paleozoic? What drivers shaped its temporal evolution? I use the GENIE Earth System Model to simulate the evolution of the physical environment during the Phanerozoic, and the consequence on the marine biosphere at various temporal and spatial scales.