Green Matrix uploaded: a new ecosystem variable for marine resources sector (GREENUP)

The European Common Fisheries Policy (CFP) promotes the sustainable use of marine waters and the conservation of marine ecosystems at national, European but also international levels through the Marine Strategy Framework Directive (MSFD). This objective requires implementing observation and scientific studies for ecosystems understanding and characterization. While the management of marine ecosystems is facing many problems including overexploitation, pollution, biodiversity loss and threatened habitats, oceanic micronekton appears as a key explanatory variable to understand and model the habitats and population dynamics of most large marine species. Therefore, the micronekton appears as a missing link between biogeochemical model products (e.g., ocean primary production, zooplankton biomass) and all species of the upper trophic levels, from which many are exploited species (tunas, mackerel, herring, cod, blue whiting…) or protected species (e.g., turtles, whales and other marine mammals, sharks and seabirds).

GREENUP is a project funded by the COPERNICUS CMEMS service evolution (http://marine.copernicus.eu/). The objective of GREENUP is to extend the CMEMS catalogue by developing a new product covering this key ecosystem component at the mid-trophic level, i.e., the micronekton, to better address the Marine Resources area of benefit. The project includes improvement, validation and sensitivity analyses of a micronekton model simulating several functional groups of micronekton for the oceanic epi- and mesopelagic layers (0-1000m). link to previous newsletter: https://www.mesopp.eu/seapodym-mtl-modeling-the-ocean-micronekton-biomass/.

The model is driven by CMEMS products (ocean temperature, horizontal currents and primary production) and has been shown very sensitive to the accuracy of oceanic currents. Therefore, different simulations are produced with several physical ocean reanalyses and hindcasts to investigate the impact of assimilating satellite and in situ data in the ocean circulation models (GLORYS http://marine.copernicus.eu/services-portfolio/access-to-products/?option=com_csw&view=details&product_id=GLOBAL_REANALYSIS_PHY_001_025).

Validation and analyses include the use of acoustic data as in the MESOPP project but with a focus on the Atlantic ocean, and feedbacks from upper trophic models using micronekton outputs as a key explanatory variable, for instance to simulate distribution of tuna species, whales (in collaboration with the University of Azores) or the Atlantic mackerel (in collaboration with Denmark Institute of Aquatic Resources).

GLORYS2v4 (free run)

GLORYS2v4 (assimilation)
Snapshots of lower (non migrant) mesopelagic micronekton biomass predicted for the 1st week of June 2010 with GLORYS2v4 with and without data assimilation.