DATE2018-05-11 11:38:04
IDABSTRACT20180511113804-0161
CONTACTlaurent.li@lmd.jussieu.fr
PRESENTATIONORAL
INVITED0
IDSESSION3
TITLERECENT UPDATES OF LMDZ/NEMO-MED8 AND ITS APPLICATION IN AN ENSEMBLE OF CLIMATE CHANGE SIMULATIONS FOR THE MEDITERRANEAN REGION
AUTHORSL Li (1)
AFFILIATIONS
  1. LMD, CNRS, Sorbonne Université, Paris, France
ABSTRACTLMDZ/NEMO-med8 is a regional ocean-atmosphere coupled model for climate simulations in the Mediterranean basin. Its atmospheric component is a variable-grid global atmospheric general circulation model, with zoom over the Mediterranean to reach a regional resolution about 40 km. NEMO-med8 is the NEMO oceanic modelling platform configured for the Mediterranean Sea with a spatial resolution of 1/8 degree. Two operational modes are available for LMDZ to be used in regionally-oriented studies. The first one is to nest LMDZ into a global climate model by relaxing its physical variables toward the driving fields outside the zoom domain. This operational mode makes the coupled model similar to a traditional limited-area model. It is however a heavy procedure since it is not always easy to assemble high-frequency 3-dimentional driving fields. The second operational mode of LMDZ is to run it in an autonomous way, with monthly global SST and sea ice fields as the only inputs to use from a global climate model. This flexibility of LMDZ allows us to easily perform a large-size ensemble of simulations, which provides a convenient way to make estimation on dispersion of results and associated uncertainties. The present work will firstly compare the two operational modes for simulations realized with IPSL-CM5A, CNRM-CM5 and MPI-ESM. Secondly results obtained with 8 global models with the second operational mode will be detailed. There are 150 years of simulation for each of them covering 1951/2005 for the historical period and 2006/2100 following the RCP8.5 scenario. Prior to the presentation of results, recent updates of the regional ocean-atmosphere coupled system LMDZ/NEMO-med8 will be mentioned with an introduction of interactive rivers runoffs in the model. It is shown that the Mediterranean Sea general circulation is quite sensitive to the fresh water amount discharged into the sea.
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