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Jeffrey T. Kiehl CCSM Scientific Steering Committee Chairman

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Presentation on theme: "Jeffrey T. Kiehl CCSM Scientific Steering Committee Chairman"— Presentation transcript:

1 Jeffrey T. Kiehl CCSM Scientific Steering Committee Chairman
Status of CCSM2 Jeffrey T. Kiehl CCSM Scientific Steering Committee Chairman

2 Outline CCSM2 Description Status of Control Simulation
An Overview of CCSM2 Results with Emphasis on Variability CCSM2 Climate Sensitivity Remaining Challenges

3 CCSM2 Description CAM2: CCSM Ocean Model
Improved Longwave Radiation & Clouds Prognostic Cloud Water Formulation Changes to Convective Precip Increased Vertical Resolution CCSM Ocean Model POP1.4 (with displaced NP into Greenland) Anisotropic horizontal viscosity formulation Increased Horizontal Resolution Revised formulation of G-M Eddy scheme

4 CCSM2 Description CSIM CLM
New Elastic-Viscous-Plastic(EVP) ice rheology New Thermodynamic model, including multi-category ice thickness scheme CLM New biogeophysics formulation Multilayer soil water and T(z) formulation Multilayer snow model with compaction River runoff scheme

5 Status of Control Simulation
Out to year 800, plan to continue simulation to year 1000 Last change made at year 350 (common physical constants) No flux correction applied Model drifts: -0.04 K/century in surface temperature -0.07 K/century in volume avg. ocean T psu/century in volume salinity

6 Long Terms Trends

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10 CCSM2 Challenges Double ITCZ Excessive Cold Pacific Cold Tongue
Excessive Warm Eastern Boundary Water Cold Tropical Tropopause Excessive High Latitude Surface Temperatures

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14 An Overview of CCSM2 Results
with Emphasis on Variability

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16 50 17 5.6 2.6 2.1

17 Tropical Variability

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20 Nino3 SST Power Spectra from CCSM2 & Reanalysis

21 Polar Climate Variability

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28 Seasonal Cycle Over Land

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30 CCSM2 Climate Sensitivity
Started 1% Increase in CO2 at year 220 of Control Implies: 2 X CO2 at Year 70 4 X CO2 at Year 140 Stopped 1% Simulation at Year 370 Carried out Simulation fixed at 2XCO2

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39 Current Thrusts Explore Higher Resolution Atmospheric Model in CCSM2
Continue to Improve Treatment of Cloud in CAM Development of Fully Interactive Carbon Cycle within CCSM Prepare for the IPCC Fourth Assessment

40 Acknowledgements Thanks to Jay Fein and Dave Bader for their continued support Thanks to the Working Groups for their commitment to the effort Thanks to Lydia Shiver for her support to the CCSM effort

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