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Subject: Overall communication around the PISCO project (PISces COmmunity)

Description: PISCO is a LEFE project funded for the period 2018-2020 whose main objectives are to
1. Coordinate the different modelling efforts using PISCES and stimulate collaborations between the different research groups.
2. Identify the major missing processes in PISCES and design the future evolution of the code while preserving the large diversity of usage.
3. Promote exchanges in the community and improve the formation of existing and new users of the model.
This project will gather over 30 researchers, engineers, post-doc researchers and students from 8 research institutes/laboratories: IPSL, IUEM, IGE, LOV, MARBEC, MERCATOR-Ocean, University of Liverpool and Princeton University.

The project is articulated around four scientific axes:
1. Marine biogeochemistry at the ocean-atmosphere interface
2. The cycles of trace elements and isotopes
3. The marine ecosystems up to the upper trophic levels
4. Major future developments of PISCES
The first 3 axes correspond to the activities of dedicated international programs which are respectively SOLAS, GEOTRACES and IMBeR. These programs relate to the World Climate Research Program on “carbon feedbacks in the climate system”. The fourth axis focuses on the future evolution of the model following a two-fold objective: Improving the capabilities of PISCES by adding processes which are known to be important and well constrained by data, and exploring new emerging paradigms. In addition to these four themes, training activities will be organized to share experience among users on the model and to help current and new users to make use of the model and to better interpret its results.

PISCES is a biogeochemical model which simulates marine biological productivity and describes the biogeochemical cycles of carbon and of the main nutrients (P, N, Si, Fe) (Aumont et al., 2015). Four living compartments are being explicitly modeled: Two phytoplankton groups corresponding to nanophytoplankton and diatoms with an implicit representation of calcifiyng organisms and nitrogen fixers, and two zooplankton size-classes which are micro- and mesozooplankton.
PISCES is embedded in two ocean modeling platforms (NEMO and CROCO), in three Earth System models (IPSL-CM, CNRM-CM and EC-Earth) and in one operational system (MERCATOR-Ocean). This large diversity as well as the growing number of users are representing challenges for PISCES both in terms of its current capabilities and its future developments. Furthermore, progresses in observing system, such as the large scale metagenomic sampling cruises (for instance, TARA), have stimulated advances in our understanding in the functioning of marine ecosystems. These advances question the current concepts on which most models rely and require to rethink these models.

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