Accueil du site > Recherche > Projets et Partenariats > Aperçu de quelques projets scientifiques du LGGE > Southern Cross : Southern Ocean variability and Cross-scale interactions Understanding and modelling the mechanisms of climate variability in the Southern Ocean
par- 15 décembre 2012 - ( maj : 15 décembre 2012 )
This project aims at reducing the uncertainty due to our imperfect knowledge of the Southern Ocean physics. In that respect, a major source of uncertainty is our ability to model the response of the Southern Ocean water masses properties and export mechanisms to atmospherically driven variability, a key issue being the representation of eddy forcing and lateral stirring processes.
The present project rationale is (i) to describe the space and time variability of SAMW and AAIW properties over the past 30 years (at seasonal to decadal time scales, at basin scale), (ii) to identify and map the dominant processes which are responsible for water mass changes, (iii) to relate each process contribution to atmospheric variability.
To that end, a hierarchy of hind-cast ocean/sea ice model experiments is proposed in order to describe the space and time variability of these water masses over the past 30 years and to understand the dynamics driving their variability, with a particular focus on lateral mixing processes. The modelling strategy is based on the experience of the DRAKKAR consortium within the NEMO modelling framework. The proposed diagnostic approach bridges from ocean submesoscales to climate scales within a unified framework. The project will be steered in close collaboration with biogeochemists. Besides, the project will deliver