Marine ecosystem models use very different basic structures to represent food-web or ecosystem components and the links between them. Ecosystem components can be represented by size classes, functional groups, trophic levels, species groups, and life-history stages, whereas links can be represented by who-eats-whom networks, diet composition or energy transfer. Another challenge is that our models do not all use the same input and output variables. Finally, there are limited observational data for historical runs and model validation, and limited data on spatially resolved fishing effort.
FishMIP Phase 1 2020
The goal of FishMIP Phase 1 2020 is to provide input to the IPCC WGII AR6 report. This necessitates submitting a manuscript by November 1 st 2020. The focus of this simulation round will be on (a) new FishMIP outputs using climate scenarios from the CMIP6 earth-system model forcings; (b) exploring fishing impacts in addition to those of climate; (c) comparison to a no-climate change pre-industrial control baseline (which was not available for the last round of simulations), and (d) if possible, validation against observed catches.
Note that this FishMIP Phase 1 protocol represents only a subset of the full ISIMIP3b protocol with a smaller set of scenarios considered. The FishMIP Phase 2 2021 protocol will build upon these experiments.
The ISIMIP2a simulation protocol represents the choices we have made in order to compare as many global and regional models as possible. These include common inputs with respect to climate, physical and chemical data (temperature, currents, salinity, pH, oxygen), biological data (e.g. primary production, phyto- and zooplankton), and fisheries data (effort, catch, fisheries mortality) as well as common outputs including fish biomass and catch as well as other ecosystem parameters.