2019 Annual Workshop

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

21-23 January 2019

The DRAKKAR workshop will be followed by the Kick-Off Meeting of the IMMERSE project

IMAG Amphitheater, 700 Avenue Centrale, Campus of Université Grenoble-Alpes
24-25 January 2019






WORKSHOP 2018  [here ]

IMMERSE Kick-Off Meeting  [here]


Monday evening dinner [Menu]

Snow Shoe Hike [closed]

Scientific Organizing Committee  


Bernard Barnier (IGE)

Anne Marie Treguier (LOPS)

Arne Biastoch (GEOMAR)

Claus Böning (GEOMAR)

Joël Hirschi (NOCS)

Adrian New (NOCS)

Camille Lique (LOPS)



Local organizing committee & Contact:

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.




1 - Abstract submission (opens 15 October 2018, closes 15 December 2018).

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.

When presenting the results of their research, speakers are invited to consider how their results contribute to the main foci of this year workshop. The foci, which will drive the organization of the workshop agenda, are given below.

AGENDA [here] and List of submitted Abstracts [here]

Foci of the 2019 Workshop


1 ) Benefits, challenges and future needs regarding basin-scale ocean simulations at 1/20-1/60° resolution.

This session will present results from high-resolution simulations (basin-scale or using AGRIF nests), as well as the development of new strategies and new tools. Questions addressed could be:

·        How should we force/parameterize/evaluate these models with respect to observations and theories?

·        Can we avoid the need of massive CPU consumption through e.g. improved SGS parameterizations or computing tricks (e.g. well-chosen single-precision computations)?

·        How will we make best use of high-resolution output at 1/20°-1/60° and beyond?

·        What tools allow do deal with such large amounts of output?

·        Can we learn something new about our models (and hopefully the ocean, too) by applying data science methodologies such as machine learning and big data statistics?


2) Understanding ocean-ice-atmosphere interactions, and their consequenses for ocean modelling strategies.
This session will present results from forced, coupled and partially coupled ocean-ice-atmosphere models, to address the following questions:

·        How precisely (and how much) are the ocean physics distorted, at various space & time scales, in ocean-only models driven by bulk formulae (water mass life cycle, surface & subsurface circulation, energetics, air-sea interactions, etc) ?

·        What new strategies, based on high resolution coupled ocean-atmosphere models, can be proposed to force ocean models? The latter includes the use of atmospheric boundary layers models (e.g. cheapAM, Albatros/SIMBAD).


3) Improving ocean models for climate and operational applications.
This session will present theories, parameterizations, and numerical issues related to key physical processes to be improved in ocean models, with a focus on NEMO:

·        Bottom boundary layers, dense overflows, mixing, western boundary current separation, surface mixed layer, scale interactions, interactions between low frequency motions and tides, etc.


4) Atmospherically forced vs Intrinsic ocean variability, uncertainties and ensemble strategies

This sessions will address the following questions:

·        How slaved to the atmosphere are the ocean dynamical & thermodynamical variability (at various space and time scales) ?

·        How robust are our ocean solutions in our (partially chaotic) high-resolution oceanic models ?

·        How to conclude about model and forcing sensitivities when solutions can differ substantially from slight initial condition perturbations ?

·       What is the potential impact of the multi-scale (eddy-to-gyre, weekly-to-multidecadal) oceanic “chaos” on the atmosphere and climate ?

Proposed discussion items

1) Drakkar Science:
What do we know about the strengths and weaknesses of ocean-only simulations versus coupled O/A simulations? and what should be the proper methods of evaluation, types of experiments, diagnostics etc. to adress this issue?

2) Drakkar Organisation:
Could the Drakkar community better share experience with NEMO and how could the Drakkar community contribute better to the development of NEMO ?