1. J.T. Kiehl National Center for Atmospheric Research
On the Road to CCSM2 Part 1
J.T. Kiehl
National Center for Atmospheric Research

2. Outline Atmospheric Component for CCSM2 Land Component for CCSM2
Climate Change Experiments
Improvements for CCSM2

3. Atmospheric Component for CCSM2
Improved Water Vapor Longwave Model
Generalized Cloud Overlap Scheme
26 Vertical Levels
Prognostic Cloud Water Scheme
Modification to Deep Convection Scheme
Topographic Filter

4. Improvements in Atmospheric Simulation
Improved Tropical Precipitation Patterns
Improved JJA Tropical Wind Stress
Improved Tropical Upper Troposphere Winds
Improved Stratus Cloud Formation
Improved Water Vapor Distribution

6. Collins (2001)

11. Land Component for CCSM2
Biogeophysics
Hydrology
Catchment Hydrology and River Flow

12. Community Land Model version 2
Biogeophysics
Hydrology
Latent Heat Flux
Sensible Heat Flux
Photosynthesis ua
Momentum Flux
Wind Speed
Precipitation
Diffuse Solar
Radiation
Longwave Radiation
Evaporation
Interception
Canopy Water
Direct Solar
Radiation
Transpiration
Reflected Solar
Radiation
Emitted Long-
wave Radiation
Throughfall
Stemflow
Absorbed Solar
Radiation
Sublimation
Evaporation
Infiltration
Surface Runoff
Melt
Snow
Soil Heat Flux
Soil Water
Heat Transfer
Redistribution
Drainage
Merging of BATS, IAP94, NCAR LSM
10-layer soil to depth of 3.5 m with ice and liquid water contents
Canopy physiology with photosynthesis and transpiration from sunlit and shaded leaves
Root depth distributions based on global ecological synthesis
TOPMODEL-like runoff from upland hillslopes and saturated lowlands
Multi-layer snowpack with compaction and re-freezing
Sub-grid mosaic of plant functional types
Snow
Catchment Hydrology
And River Flow
Soil Water
Global ½º river flow network
Called every 3 hours
River flow balances water
Surface Runoff
Ground Water
Lake
Ocean

16. Climate Change Research
Simulation of the 20th Century (Natural Forcings)
Ensemble Climate Change Simulations

17. Ammann et al. 2001

20. Ammann et al. (2001)

22. Dai et al. (2001)

23. Development Issues for CCSM2
Cloud Liquid Water Path over Sea Ice
Dynamical Core Effects on Polar Region
Double ITCZ in Coupled Model

24. Holland (2001)

30. Lin-Rood