Leader: Christian Ethé 

Leader: Christian Ethé 

Task 2.1 Preparation of the physical configuration eORCA025


Starting date : T0 duration : 6 months

Main contributors: G. Maisant, J. Deshayes, R. Person, C. Ethé


  • The purpose of this task is to prepare eORCA025 physical model configuration to be run with coupled biogeochemistry.
  • The work will consist in a series of sensitivity test performed within the frame of OMIP forcing protocol and based on the expertise of the DRAKKAR group (physics) and of LSCE (physics + BGC). The tests will allow to define a choice of parameters for vertical physics and also to improve the representation of vertical velocities in the model solution.
  • The expected outcome is an improved physical model solution that is well adapted to coupling with PISCES to be used in WP3 and WP4.


Task 2.2 Integration of the biogeochemical component eORCA025-PISCES


Starting date : T0 + 6 duration : 6 months

Main contributors: C. Ethé, R. Person, C.Bricaud


  • The purpose of this task is to integrate eORCA025 with PISCES and the online coarsening capability.
  • The work will first consist in a series of calibration tests with eORCA025 and an age tracer including the online coarsening capability. Second, based on the results of 1.2, we will perform a series of test simulations that will be carefully compared with observations for both the physics (including sea ice) and the biogeochemistry components.
  • The expected outcome is model solution (i) that compares favorably with observations and (ii) that is produced with reduced cost thanks to the coarsening capability. The model solution and development will be presented in a paper to be prepared for Geophysical model Development and will serve as a baseline configuration for OMIP inter-comparison.

Task 2.3 Production of reference and sensitivity experiments to changing stressors.


Starting date : T0 + 12 duration : 12 months

Main contributors: E. Alekseenko, C. Ethé


  • The purpose of this task is to produce the series of ensemble sensitivity experiments that will be the base material for WP3 and WP4.2.
  • Based on the recommendations of WP3.1, we will perform a series of multi-decadal simulations with reference and perturbed forcings with eORCA1 and eORCA025. We will in particular explicitly modify the forcing in order to account for changes in surface winds, in radiative forcing and in glacial input of iron and freshwater.
  • The expected outcome is the scientific material for WP3.3 and WP4.2.