Centre Européen
de Recherche et d'Enseignement
des Géosciences de l'Environnement

ANR HAMOC : Holocene North Atlantic Gyres and Mediterranean Overturning dynamic through Climate Changes

Funding period: 2014-2017

PI Christophe Colin (IDES), Kazuyo Tachikawa (PI-local)

Summary: This project aims at producing geochemical robust proxy reconstructions in key regions of the North Atlantic and Mediterranean Sea for the past 11,500 years using established paleoceanographic proxies of sea surface temperature (d18O and Mg/Ca from foraminifera, alkenones, microfossil assemblages), geochemical water mass tracers (eNd and d13C of foraminiferal tests) as well as novel tracers (eNd d, Li/Mg) recorded in precisely dated cold-water corals (U/Th dating). HAMOC will strongly benefit from new laboratory infrastructure such as cutting edge mass spectrometry techniques (Neptuneplus MC-ICPMS – IDES/LSCE and CEREGE) and recent analytical developments for rapid and precise isotope measurements (eNd) and age determination (U-series and AMS 14C dating) on corals. On the modelling side, the project will benefit from long simulations over the Holocene from the state-of-the-art IPSLCM5A climate model where ocean tracers are implemented.