1. CLIVAR Workshop, Paris, 17-19 November 2010 New strategies for evaluating ENSO processes in climate models Organising committee: Eric Guilyardi, Wenju Cai, Mat Collins, Alexey Fedorov, Fei-Fei Jin, De-Zheng Sun, Andrew Wittenberg on behalf of the CLIVAR Pacific Panel

2. Goals of the workshop Present and discuss emerging new methods for the process-based evaluation of ENSO in GCMs, their use in multi-model assessments and identify future directions and associated challenges. Encourage networking of experts and students / postdocs Propose community recommendations and actions (incl. CMIP5 analysis)

3. Agenda Wednesday am: ENSO theory, observation, change Wednesday pm: ENSO in GCMS Thursday am: ENSO in GCMS (cont’d) Thusrday am: Poster session Thursday pm: ENSO in GCMS (cont’d) Friday am: Wider perspectives Friday pm: Discussion and outcomes

4. Discussion sessions Make an inventory of the existing approaches to evaluate ENSO processes in GCMs; compare, contrast and discuss the relative merits of these approaches as for example applied to CMIP5 Review the potential of methods bridging ENSO theoretical frameworks and GCM modelling Review the observing system and available data for the evaluation of ENSO in GCMs Discuss how to best organise CMIP5 analysis to feed into AR5

5. Possible outcomes Workshop summary and white paper(s) Strategy for CMIP5 analysis Development of a CLIVAR web-based inventory of ENSO evaluation methods and associated bibliography

6. Proposed evening homework List : –your top 3 priorities for CMIP5 ENSO analysis –the 3 most promising avenues (or barriers) you see to improving ENSO simulations / projections –the 3 most important things you've learned from the workshop –any relevant obs products / theories / subjects we've overlooked?

7. Logistics Coffee and lunch breaks: T56, 2 nd & 5 th Floors (Thurs. am) Poster session: T56, 5 th Floor Welcome cocktail (17 th ): T56, 5 th Floor LOCEAN/IPSL admin: T45, 4 th floor Please load your presentations in advance

8. Workshop dinner Thursday (7:30-11:30 pm) Get there in time ! Location: see map in workshop material Color coded coupons for choice of dishes (get at coffee breaks)

9. Thanks to Nico Caltabiano (International CLIVAR Office) Dany Thomas, Christiane Willem, Florence Deschamps (LOCEAN/IPSL) Catherine Michaut (WCRP ACC Office @ IPSL)