Description du projet
Faire la lumière sur le cycle du Ba dans l’océan Austral
Le baryum (Ba) constitue un outil d’évaluation de la reminéralisation du carbone organique dans plusieurs zones océaniques. Cependant, le cycle du Ba et ses équilibres dans les océans restent mal connus. Les mesures de la composition isotopique du Ba (138Ba) sont susceptibles de fournir des informations significatives sur ses sources et processus. Dans la mesure où l’océan Austral est une région critique, il est essentiel d’étudier plus en profondeur son impact sur le cycle du Ba. C’est ce qu’entend faire le projet BaSIS, avec le soutien du programme Actions Marie Skłodowska-Curie. Il étudiera la présence du 138Ba dans l’eau de mer et les particules marines à partir des travaux de la campagne GEOTRACES SWINGS dans l’océan Austral. Ses résultats présenteront un grand intérêt pour les chercheurs qui étudient l’impact du cycle global du carbone.
Objectif
Barium (Ba) has been proven to be a particular useful tool to estimate organic carbon remineralization in various areas of the world’s ocean. To date, however, the Ba cycle and its budgets in the ocean are not well constrained. Indeed, in the ocean, sources of Ba from hydrothermal alteration and deep-sea sediments, but also the internal Ba cycle are hard to constrain with Ba concentrations alone. The use of Ba isotopic composition (138Ba) measurements can provide meaningful insights on these sources and processes. Specifically, different inputs and different biological processes influencing the Ba distribution in the ocean have distinct 138Ba. However, surveys of 138Ba, in seawater and particles in the Southern Ocean (SO) has never been made. It is particularly important to understand the impact of the SO on the Ba cycle, as any preformed Ba or other sources of Ba in the SO would have a large impact on its use as a remineralization tracer in the global ocean. BaSIS is thus a unique opportunity to enhance knowledge on the Ba cycling in this key oceanic region by studying 138Ba in seawater and marine particles from the GEOTRACES cruise SWINGS in the SO.
The fellow will spend the first two years at the Laboratoire de l’Envionnement Marin (LEMAR) under the supervision of Dr. Planquette. This fellowship will allow her to come back to Europe with the technical expertise she acquired outside of the EU in the past years. She will implement a new technic and will acquire a unique overview of the Ba cycle in the global Ocean. Research results will be of interest to worldwide researchers working on the study of the impact of the global carbon cycle, promoting European excellence and competitiveness in dedicated European and international carbon export projects.
Champ scientifique
Programme(s)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Régime de financement
HORIZON-AG-UN - HORIZON Unit GrantCoordinateur
75794 Paris
France