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REmineralisation, OPTIcs and Marine partIcle siZE (REOPTIMIZE)

Deployment of Arvor floats from the French R/V Pourquoi Pas

Completed project

Project start: June 2016  |  Project end: June 2018
Funder: European Commission, HORIZON 2020 Marie Skłodowska-Curie Actions
Principal Investigator: Dr Giorgio Dall'Olmo

In the REOPTIMIZE project,  the relationships between the size of marine particles and how they interact with light will be examined across the Atlantic Ocean using data collected from the Atlantic Meridional Transect cruises.

Then, the possibility of monitoring changes in particle size and concentration using autonomous profiling platforms, such as the Bio-Argo floats deployed by the PML, will open the way to improving our understanding of the magnitude, variability and pathways of particle remineralisation and carbon fluxes in the mesopelagic region of the ocean. This ultimately will help understanding better the Earth’s climate change.

Remineralisation is the conversion back to CO2 of sinking particles such as the phytoplankton. Knowing the depth at which this key process in marine ecosystems occurs is critical to predict how fast the remineralised CO2 will be re-exchanged with the atmosphere. Monitoring the modifications in size of living and non-living particles over the time and the space can help constraining better this process.

Image: Deployment of Arvor floats from the French R/V Pourquoi Pas courtesy of the Argo Program.