2018 Annual Workshop

IMAG Amphitheater, 700 Avenue Centrale, Campus of Université Grenoble-Alpes

22-24 January 2018





Getting to IMAG    [here]

Snow Shoe Hike [to come]

Workshop 2017     [here]

Related Workshops

  Sea-Ice Day (25 January)


  Overflows (25 January)



Side events

Monday evening dinner [Menu]

Prudhomme prize award [here]
Tuesday 23 January 17h30


Scientific Organizing Committee  


Bernard Barnier (IGE), Anne Marie Treguier (LOPS), Arne Biastoch (GEOMAR), Claus Böning (GEOMAR), JoëlHirschi (NOCS), Camille Lique (LOPS), Adrian New (NOCS)




Bernard Barnier:


Laurent Debreu :


Anne Marie Treguier:






The overall objective is to review the scientific and technical progresses achieved with the DRAKKAR hierarchy of model configurations based on the NEMO platform, identify strengths and weaknesses of these models, and discuss key model improvements and new developments that are needed for the future.

The workshop is open to contributed talks from participants, but high priority is given to discussions. Speakers are encouraged to present their most recent results or ongoing research. Candid presentations of "things that do not work" in the numerical simulations are welcomed, because they foster interesting discussions and contribute to the progress of the modelling community.



Workshop Agenda with links to the presentations [here]


List of Submitted Abstracts [here]


Foci of the 2018 Workshop


1 - Model evolution in the eddy-resolving regime

The objective is to highlight model evolutions/issues that are relevant to improve simulation outcomes in the eddy-resolving regime. This could include in realistic high-resolution configurations of NEMO:

• Advances and new approaches in modelling systems

• Representation of surface air-sea-ice interactions.

• Relevance of deterministic vs probabilistic simulation approaches.

• Sub-mesoscale processes and sub-grid-scale parameterisations: their resolution and parameterisation.


2 – Coupled Ocean-Atmosphere Modelling

The objective is the review progresses in the coupling of eddy-resolving ocean model with atmospheric models used for weather or seasonal forecasting and climate projections.


3 – Tides, Boundary Layers, Dense Water Formation and Overflows

The objective is to highlight recent advances in the simulation of the dense water formation processes and the ventilation of the interior ocean. We would like to assess the model ability to simulate the major topographically-influenced circulation features such as:

• Gravity currents, overflows and the formation of bottom water masses

• Tides

• Regional studies of open ocean convection from recent observations and models.

• Impact of freshwater on dense water formation in high latitude regions (including calving fluxes).

• BGC variables like oxygen, nutrients or geo-tracers, as indicators of the deep ocean ventilation.

• Control of the deep ocean ventilation by the non-convective vertical mixing parameterisation in NEMO.

Beyond contributing to a better understanding of these circulation features, presentations should also aim to identify where the numerical treatment of the topography introduces major flaws and to discuss ways of improvements.


Working group meeting on deep overflows (Thursday 25 January) [link]: Organised by Helene Hewitt (UKMO) and Bernard Barnier (IGE) this meeting aims to set-up a small working group with the objective to define a precise coordination plan for 2018 regarding the treatment of the major overflows in the ORCA12 model based on the local implementation of the sigma coordinate in NEMO presently tested at IGE.


4 - Sea-Ice Modelling and sea-ice covered regions.

To review on-going scientific studies in the Drakkar community that involve a sea-ice model.

• To highlight strength and weaknesses of present sea-ice models used in the NEMO community.

Communications related to this topic are scheduled in the last session of Wednesday afternoon and serve as an introduction to the Sea Ice Day, a small workshop that is organized on Thursday 25 January.


Sea Ice Day (Thursday 25 January) [link]: Organized by Camille Lique (LOPS) and Martin Vancoppenolle (LOCEAN) this workshop (on invitation) will review the present status and future evolution of the NEMO sea-ice model.


Proposed discussion items

The Drakkar workshop leaves place to a significant time for discussions. The proposed discussion items for this 2018 venue are described below.


5 - Plans for NEMO and its role in the international field of ocean modelling. (Planned Tuesday, 16h00-18h00)

This discussion session should be introduced by presentations by the participating groups of their NEMO based on-going and future projects. Discussion should then focus on:

• How individual  activities could lead to collaboration and (possibly funded) joint projects

• What do we expect or needs in terms of evolution of models and simulation strategies to best carry out our future projects?

Answers to these questions should strongly influence the future of Drakkar.


6 - DRAKKAR hierarchy of NEMO-based global model configurations. (Planned Monday 16h-18h00).

The Drakkar hierarchy of global model configurations covers resolutions from 2° to 1/12° all using a quasi-isotropic tri-polar ORCA grid.

Issues that we would like to address during this discussion session are:

What is the hierarchy today and in what way is it "coherent"?

• How do the different Drakkar participants see the way forward?

• How does the ORCA hierarchy compare with similar hierarchies built by other groups worldwide?



1 - Abstract submission (Closed).

Send your abstract to bernard.barnier@cnrs.fr and copy to anne.marie.treguier@ifremer.fr


2 - Content of Presentations.

The talks at the Drakkar workshop are not meant to be of the same type as EGU or AGU. For this reason we recommend that your contributions emphasise the scientific content of your studies as well as model development issues, with the aim to contribute to the open discussions on improving the quality of ocean models and global ocean model configurations.