Titre :
Modélisation du couplage physique-biogéochimie en Méditerranée: impact du forçage anthropique sur la biodiversité marine.
Directeurs de thèse :
J-C Dutay, L Bopp (LSCE)
K Béranger (ENSTA ParisTech)
Résumé:
Numerical modeling represents a useful tool to assess the vulnerability of ecosystems to the variation of its forcing. In the context of the Mermex program which is devoted to the study of the impact of variation of the anthropogenic forcing on the ecosystems of the Mediterranean Sea, we propose to develop a modeling platform that would help to address these scientific questions. The physical model is the NEMO model in a 1/12° version elaborated for the Mercator operational project. The biogeochemical model is the PISCES developed at IPSL in which the biodiversity is represented by broad functional groups (2 phytoplankton and 2 zooplankton groups). If these two models have been already coupled and used for many biogeochemical studies both at the global and regional scales, it has never been applied to the Mediterranean Sea. In this project we propose to build a NEMO-PISCES configuration for the Mediterranean Sea and to apply it for studying the impact of environmental changes on marine biodiversity. We will investigate the impact of both uptake of anthropogenic CO2 (acidification) and climate change on the ocean ecosystem and more specifically on the partition between the two phytoplankton and zooplankton groups.
The development of this new coupled ocean biogeochemical model for the Mediterranean Sea will offer an additional tool. It thus represents a complementary approach to the development of the coupled biogeochemical model NEMO/ECO3M developed in the context of the MORCEMED GIS project, that will next offer the opportunity to address scientific questions with a larger variety of models.
Mots-clefs : biodiversité, modélisation