Nantes - Bât. 4

Tél : +33 (0)251125296

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Research Interests:

My research focuses on the study of paleoceanography and paleoclimatology with a special emphasis on understanding the origin and mechanisms of abrupt climate change. I estimate past environmental and climatic changes by measuring the geochemical composition of carbonate fossils. I use different types of climate archives 1) planktonic and benthic foraminifera deposited in deep-sea sediments 2) marine bivalves and 3) deep water corals.

1) The Mid-Pleistocene Transition: The Mid-Pleistocene Revolution is one of the most recent climate transition characterised by an evolution of glacial to interglacial cycles which occurred every 40,000 years to every 100,000 years. The appearance of the 100kyr Glacial Interglacial cycles remains one of the big mysteries in paleoclimate studies. This project uses sediment core records collected from offshore from New Caledonia to study the relationship between changes in ocean circulation in the South Western Pacific Ocean and the construction of coral reefs during the Mid-Pleistocene Transition.

2) Marine bivalves and PaleoENSO:  Marine molluscs can be used as a tool to reconstruct past climatic evolution with seasonal resolutions. Geochemical transects across the annually secreted layers of carbonate are used to reconstruct past environmental changes. We use the results derived from fossil giant clams to reconstruct past changes in interannual climate variations such as El Nino Southern Oscillation (ENSO).

3) Holocene climate variability and deep water corals: Deep water coral reef environments can be found at various water depth around the Atlantic region. Thanks to their high growth rates we are able to derive information on ocean circulation with centennial timescales.