R/V Coriolis II expedition TCA-MEOPAR – COR2025 HOLOCENE SAGUENAY

This cruise report describes the R/V Coriolis II expedition TCA-MEOPAR – COR2025 HOLOCENE SAGUENAY. The mission is part of the TCA cluster 1.1. UncertainSea, workpackage Land-to-Sea, which aims to investigate land-to-ocean matter fluxes in various fjords along a latitudinal transect from the Saguenay Fjord, Québec, to Croker Bay, Devon Island, Canada throughout the Holocene. This cruise was dedicated to sample sediment cores from the head of the Saguenay, at the mouth of Baie Des Ha! Ha!, and in the central upper fjord near Grosse-Ile. Gravity coring was performed to retrieve long sedimentary sequences with sufficient resolution to capture natural climatic, sedimentological, and depositional changes. Parallel cores from each sampling site were obtained to allow analysis of a multitude of non-destructive and destructive proxies. In addition to gravity coring, surface samples from within and outside the fjord were obtained by multicorer (to sample the water-sediment interface, including the fluffy layer, and uppermost sediment samples) and boxcorer (for 3D imaging of the uppermost sediment).