Descrizione del progetto
Chiarire il ciclo del bario dell’Oceano Antartico
Il bario (Ba) è uno strumento per la valutazione della remineralizzazione del carbonio organico in diverse aree oceaniche a livello globale. Ciononostante, il ciclo del bario e i suoi bilanci negli oceani non sono ben definiti. Le misurazioni della composizione isotopica (138Ba) del bario possono fornire indizi significativi su queste fonti e sui relativi processi. In particolare, risulta essenziale la comprensione dell’impatto esercitato dall’Oceano Antartico sul ciclo del bario. Con il sostegno del programma di azioni Marie Skłodowska-Curie, il progetto BaSIS chiarirà il ciclo del bario in questa regione oceanica di importanza critica. Il progetto studierà l’isotopo 138Ba nelle particelle marine e di acqua salata grazie alle spedizioni in nave SWINGS di GEOTRACES per l’Oceano Antartico. I risultati rivestiranno interesse per i ricercatori impegnati nello studio dell’impatto generato dal ciclo globale del carbonio.
Obiettivo
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.
Programma(i)
- HORIZON.1.2 - Marie Skłodowska-Curie Actions (MSCA) Main Programme
Meccanismo di finanziamento
HORIZON-AG-UN - HORIZON Unit GrantCoordinatore
75794 Paris
Francia