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Next Generation CPTs

Next Generation CPTs. Lessons learned: criteria for a successful CPT. Relevance: Process which is poorly represented in state-of-the-art climate models, where improved representation will lead to improved/more credible climate simulations

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Next Generation CPTs

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  1. Next Generation CPTs

  2. Lessons learned: criteria for a successful CPT • Relevance: Process which is poorly represented in state-of-the-art climate models, where improved representation will lead to improved/more credible climate simulations • Readiness: Process where recent developments from theory/process modeling/obs are ready to be transferred to climate models • Focus: Narrow well-defined focus • Model independence: Topic of interest to multiple climate modeling centers • Commitment: Someone with a need to see it succeed has to push it forward

  3. Modeling center feedback on areas for new CPTs: oceans and ice Ice processes • Ice shelf and ice sheet representation, icebergs (GFDL); rapid sea ice melt, ice sheet physics (LANL) Processes affecting Tropical SST • Eastern Eq Pac upper ocean (gmao, upwelling both coastal and equatorial, surface ml: CCSM; also GFDL, LANL) • Equatorial upwelling cell (CCSM); equatorial cold tongue bias (GFDL) • Equatorial diapycnal mixing (GFDL) • Equatorial lateral mixing (GFDL) Other processes • Southern ocean ventilation (GFDL) • Tidal mixing in shallow seas (e.g. Indonesian throughflow) (CCSM) , tidal mixing (GFDL) • Antarctic deep water formation (GFDL) • Southern ocean warm bias (GFDL, possibly aerosol related)

  4. Modeling center feedback for new CPT areas: Atmosphere Processes related to tropical precipitation/ITCZ • convection pbl interactions • parameterization of microphysics • land interaction • deep and shallow convective momentum transports Cloud and convection processes • independent column approximations for radiation and cloud microphysics • vertical velocity distributions in convective parameterizations • mesoscale organization in convection parameterizations • sensitivity to closure and trigger formulations. Other processes • MJO (gmao – tuning to improve MJO deteriorates other climate procs) • Land surface processes (gmao, sensitivity of evap to soil moisture variations) • Aerosols: representation of optical and microphysical properties, improved formulations for ice nucleation

  5. Suggested route for white paper • Purpose of white paper is to provide guidance for new CPT proposals – call for proposals should be next spring so that projects can start in Sept 08 • White paper therefore needs to be out by winter 08 • White paper committee should therefore meet in fall 07 • Committee should consist of experts in model development and key processes • Identify committee members and make meeting arrangements within next couple of months. • Scope of white paper: Which processes are ripe for CPTs (e.g. have sufficient understanding available, ideas for parameterizations, need for better representation, enthusiasm from modeling centers), and outline of criteria for a successful CPT proposal. • Action items for panel: write prospectus/TOR for white paper committee, identify members of committee (within next 2 months).

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