CAB Meeting, NSF, Nov. 5-6, 2003 Sea Ice (CSIM 4) (1o) Component Models in CCSM Atmosphere Multiple dynamical cores: SLD, Eulerian, & Finite Volume Generalized 2D decomposition of grid Resolutions with most heritage: T31, T42, and T85 (L26)
Ocean Derivative of LANL Parallel Ocean Program Grid: spherical in S. hemisphere, orthogonal curvilinear in N. hemisphere Standard resolution: 320 x 384 (L40) Land Surface Superset of NCAR LSM and Georgia Tech BATS Same horizontal resolution as atmosphere 10 layers for soil, up to 5 for snowpack
Sea Ice Up to 5 categories of sea-ice thickness CAB Meeting, NSF, Nov. 5-6, 2003 Atmospheric Dynamics and Resolution Goal for IPCC: T85 (1.4o) or equivalent FV resolution Improved resolution for regional impact studies Improved resolution for fidelity in coastal stratus regions Recommendation on atmospheric dynamics:
Eulerian for standard IPCC scenario applications Finite Volume for future development and experimentation Resolution Goal for CCSM: Single physics package for multiple dynamics & resolutions: T85 11
IPCC T42 22.5 AMWG, CVWG, Paleo, T31
. BGCWG Dynamics CAB Meeting, NSF, Nov. 5-6, 2003 Main Model Biases in CCSM2 Overestimation of winter land surface temperatures
Bias largely eliminated in new CLM and CAM Underestimation of tropical tropopause temperatures Bias reduced in new CAM Erroneous cloud response to SST changes Signs and pattern of response corrected in new CAM
Errors in E. Pacific surface energy budget Double ITCZ and extended cold tongue
Stress, latent heat flux, and insolation better in T85 CAM Cold tongue mitigated in new POP Underestimation of tropical variability Underestimation still present CAB Meeting, NSF, Nov. 5-6, 2003 Winter Land Surface Temperatures
Ocean Model Changes for CCSM 3.0 KPP boundary layer Solar Absorption (Chlorophyll) Double Diffusion Ideal Age and Passive Tracer Infrastructure Ocean Currents in Air-Sea Fluxes CAB Meeting, NSF, Nov. 5-6, 2003
Mixed Layer Depths CONTROL All Physics + Numerical MODS Jan July CAB Meeting, NSF, Nov. 5-6, 2003
SST Signature of Solar Absorption CAB Meeting, NSF, Nov. 5-6, 2003 SST Signature of All Ocean Modifications CAB Meeting, NSF, Nov. 5-6, 2003 Land Model Working Group Goal For CCSM2: state-of-the-art model with focus on biogeophysics, hydrology,
river routing Goal For Next Few Years: Natural and human-mediated changes in land cover and ecosystem functions and their effects on climate, water resources, and biogeochemistry Process: Continue to develop and improve existing physical parameterizations in the model while adding new biological and chemical process Reflected Solar Radiation Absorbed Solar Radiation
Momentum Flux Wind Speed 0 ua Precipitation Evaporation Interception Canopy Water Transpiration
Emitted Longwave Radiation r la So n ct t i o re ia Di Rad Diffuse
Solar Radiation Biogeophysics Throughfall Stemflow Sublimation Melt
Evaporation Infiltration Surface Runoff Snow Soil Heat Flux Soil Water Heat Transfer
Redistribution Drainage CAB Meeting, NSF, Nov. 5-6, 2003 Model Development for new CLM Biogeochemistry Goal: Enable parameterization of terrestrial carbon cycle New hierarchical data structures within a grid cell: grid cell land unit snow/soil columns plant functional types. Does not change climate. Allow multiple plant types on a single soil column. Minor climate changes.
Biogeophysics I Goal: Minor changes or bug fixes Allow precipitation to be rain/snow mix Improve 2-m temperature diagnostic Remove discontinuity in bulk density of snow Biogeophysics II Goal: Reduce excessive summertime temperatures in arid regions. Reduce Arctic winter warm temperature bias Turbulent exchange of heat from ground CAB Meeting, NSF, Nov. 5-6, 2003
Turbulent Heat Flux from Vegetated Surfaces CLM2.2 CLM2 CAB Meeting, NSF, Nov. 5-6, 2003 Effects on Land Surface Temperatures CLM2.2 CLM2
22-year (1979-2000) simulations of CAM2 with CLM2.2 CLM2.2 significantly cools surface air temperature CAB Meeting, NSF, Nov. 5-6, 2003 Changes to Physics in CAM3 Clouds and condensate: Improved prognostic cloud water & moist processes Transfer of mixed phase precipitation to land surface Improved cloud parameterization
Radiation: Shortwave forcing by diagnostic aerosols Updated SW scheme for H2O absorption Updated LW scheme for LW absorption and emission Surface models: Introduction of CLM 2.2 Reintroduction of Slab Ocean Model (SOM) Energy fixers for dynamics + diagnostics
and ice variables Advect cloud condensate Include latent heat of fusion Use ice & water variables for cloud optics New dependence on temperature for cirrus particle size Sedimentation of cloud droplets and ice particles Modified evaporation of rain
Convection cloud amounts from convective mass fluxes Stratocumulus clouds in lowest 2 levels Changes to autoconversion thresholds Changes to relative humidity thresholds Fall speed of droplets is function of effective radius
CAB Meeting, NSF, Nov. 5-6, 2003 Cloud Response to Tropical SST Variations CAB Meeting, NSF, Nov. 5-6, 2003 Changes in Coupler & the Sea-Ice Model Coupler
Improved performance and scaling Greater flexibility to add new fields Significant DOE communication infrastructure Faster multi-way communication to components Sea Ice
Horizontal advection scheme Addition of constant salinity in sea ice Updates to albedos of snow and sea ice Updates to ridging for thick ice categories CAB Meeting, NSF, Nov. 5-6, 2003 Surface Temperatures: CCSM T85 Control
CAB Meeting, NSF, Nov. 5-6, 2003 Sea-Ice Area: CCSM T85 Control CAB Meeting, NSF, Nov. 5-6, 2003 Sea-Ice Thickness: CCSM T85 Control CAB Meeting, NSF, Nov. 5-6, 2003 Land Surface Temperatures: T85 Control
Data for decision: T85 integrations for 3 options of 50+ years T85 SOM integrations for 1x, 2xCO2 T85 AMIP/warm-cold integrations (ENSO) Analogous data for T42
Final evaluation and decision for IPCC: SSC Meeting, Nov. 18-19 CAB Meeting, NSF, Nov. 5-6, 2003 Release of CCSM3 to the Community Contents of release: Model physics: all components = IPCC Model data sets: controls for T31,T42, & T85 Technical documentation
Schedule for release: Winter 2004 Documentation in literature: J. Climate special issue? Release of IPCC model data sets? CAB Meeting, NSF, Nov. 5-6, 2003 Climate Sensitivity: T42 CAM + SOM CAB Meeting, NSF, Nov. 5-6, 2003
CCSM Execution Speed on NCAR IBM: T42 ATM: 10.9 years/day T85 ATM: 4.3 years/day CAB Meeting, NSF, Nov. 5-6, 2003 Development Plans for CCSM, 2004-08 CAB Meeting, NSF, Nov. 5-6, 2003 CCSM: The Next Two Years
Roadmap to the future Climate sensitivity from IPCC studies Process studies from GFDL collaboration, CPTs Studies of higher resolution and benchmark calculations News physics/dynamics from Science Plan Integration of climate and chemistry
Ocean and land biogeochemistry Prognostic aerosols Tropospheric chemistry WACCM Tracers CAB Meeting, NSF, Nov. 5-6, 2003
The Evolution of CCSM CAB Meeting, NSF, Nov. 5-6, 2003 Computational Demands for CCSM Science CAB Meeting, NSF, Nov. 5-6, 2003 Conclusions A new version of CCSM is ready for IPCC
Features of CCSM3: Improvements in component physics Ability to run with multiple resolutions, dycores Issues for the near future: Final decisions regarding model configuration
Definition of public release Completion and analysis of IPCC integrations Integration of coupled carbon-climate experiments Issues for the longer term: Addition of new scientists in emerging focal areas Access to significant new computational resources CAB Meeting, NSF, Nov. 5-6, 2003 Sea-Ice Concentration: CCSM T85 Control
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Outline Introduction Method Numerical examples Conclusions Outline Introduction Method Numerical examples Conclusions Introduction Biot theory (1956) Eshelby (1957) proposed the classical formulas about the non-uniform media . ... R is an evolutional form of the Sphere Reflection Coefficient, n ...
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