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1. Assessment of feasibility

Carbon cycle model, vegetation model, soil carbon dynamics models TEM directly in WRF is not an option because it does not provide the fluxes need by the atmospheric part WRF or CCSM designed both possible (see 5.) Drive model with reanalysis Two-way-coupling ASM to CCSM (long-term goal)

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1. Assessment of feasibility

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  1. Carbon cycle model, vegetation model, soil carbon dynamics models • TEM directly in WRF is not an option because it does not provide the fluxes need by the atmospheric part • WRF or CCSM designed both possible (see 5.) • Drive model with reanalysis • Two-way-coupling ASM to CCSM (long-term goal) • Clouds bias encourage UW to particpate, WRF better cloud models also for potential coupling with marineecosystem model • Super-stable boundary layer is a problem • Need urban component in ASM • Observational studies for evaluation • Minimize parameters that must be tuned 1. Assessment of feasibility

  2. 2. Identification of potential participants Scientific community as they offer modules Need working group that discusses whether a module is for sensitivity study only or goes in as permanent element Adopt NCAR CCSM/WRF working group system to decide

  3. 3. Organizational framework Black box approach (people do not need to understand all components to do something) Well define data exchange like cpl or ESMF Expandable for various pft Pft number not tied to parallel computing What resolution? Keep hydrostatic use downscaling/upscaling AMS should also be usable in an assimilation mode to identify uncertainties Time splitting/operator splitting where it makes sense

  4. 4. Elements of an implementation plan Develop atmosphere land part parallel to the coupling ocean sea-ice atmosphere part Can already address research questions using observed SST Go for one-way coupling first Go two-way in the next proposal phase

  5. 5. Regional model opposed to global model WRF-CCSM driven vs. CCSM regionalized for the Arctic CCSM with regional CCSM nested WRF, but using CLM because of incorporated hydrology model, ecosystem part and urban model (better than LSMs used in WRF) WRF-CCSM coupled provides right frequency for tropical storms WRF better cloud parameterizations than CCSM

  6. Why? • How does the Arctic land surface influence of the climate system? • 2 aspects: • trace gases biogeochemistry • vegetation dynamics by roughness length, albedo • Tool for downscaling projections into the future

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