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CCSM Atmospheric Model Working Group Summary

CCSM Atmospheric Model Working Group Summary. J. J. Hack, D. A Randall AMWG Co-Chairs CCSM Workshop, 28 June 2001. Strengths of New Model. Improvements in several important simulation features precipitable water precipitation distribution polar surface radiation fluxes

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CCSM Atmospheric Model Working Group Summary

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  1. CCSM Atmospheric Model Working Group Summary J. J. Hack, D. A Randall AMWG Co-Chairs CCSM Workshop, 28 June 2001

  2. Strengths of New Model • Improvements in several important simulation features • precipitable water • precipitation distribution • polar surface radiation fluxes • eastern ocean solar energy budget • eastern Pacific surface wind stress • Scientifically defensible & extendible framework • spectral Eulerian dynamics with reduced linear grid • 26 levels • prognostic cloud water • generalized cloud overlap (plus requisite changes to LW & SW) • updated long wave water vapor absorption formulation • modified deep convection parameterization

  3. June 2001 Workshop Participation • 12 oral and 8 poster presentations on variety of topics • radiation transfer schemes • planetary boundary layer • cloud parameterization techniques • high resolution & extended domain simulations • numerical methods • diagnostic approaches and analyses • Open discussion • science and development priorities • issue-oriented focus groups • e.g., double ITCZ, clouds, ...

  4. AMWG Development Process • Extend Standard Experimental Procedures • uncoupled/coupled experimental frameworks • incorporation of tracers • Extend Standard Diagnostic Procedures • more comprehensive evaluation of proposed changes • include variability measures • model against observations; model against model • make all development activities & results web accessible • entrain broader community as participants in model analysis

  5. Immediate Future for the AMWG • Maintain general AMWG research infrastructure • needs to support research activities on multiple fronts • boundary layer • dynamical cores • stratiform clouds • middle atmosphere (e.g., WACCM) • radiation parameterization alternatives • cumulus parameterization alternatives • AMWG diagnostic infrastructure • needs to continue to grow in scope and complexity • evaluate model behavior across wide range of time scales • include dominant modes of climate variability in standard analysis • continued involvement of other CCSM working groups

  6. Other matters for exploration • Prioritize incorporation of new/improved physics • seek input from development, diagnostic, and application communities • Organize/prioritize activities around simulation deficiencies • solution for double ITCZ problem • solutions to weak internal variability • representation of clouds • Explore ways to establish stronger links to observational community • e.g., satellite remote sensingcommunity

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