1. NCAR-GFDL Workshops on Model Development
3 meetings in 2002/2003
Latest this October at GFDL
Focus has been on atmospheric models to date;
Analogous oceanic effort beginning to form
Will also be collaborating through atmospheric
and oceanic CPTs

2. Global climate sensitivity and cloud feedbacks
Regional climate responses
Similarities and differences in model biases
Comparing model development strategies, metrics
Sharing diagnostics and data

3. Currently running 4 100 year simulations with
SST Error Years 71-80
RMS=1.43
Currently running year simulations with
2 atmosphere and 2 ocean configurations;
Freezing model by end of month
T. Delworth

4. GFDL AM2p5 vs NCAR CAM2
B. Soden

5. GFDL AM2p12a vs NCAR CAM2x
B. Soden

6. Trade inversion height
AM2p10
AM2p12
meters
S. Klein

7. 2 meter relative humidity
AM2p10
AM2p12
percent
S. Klein

8. J. Kiehl

9. J. Norris, UCSD

10. Compare sensitivities, cloud feedbacks, regional responses
in a hierarchy of model configurations
Coupled scenarios
1% per year CO2 increase (CMIP)
Equilibrium response with flux-adjusted slab-ocean
Response to composite CMIP SST perturbation at time of CO2 doubling
“Cess” uniform SST perturbation

11. “Cess” Method Uniform ocean warming Measure change in TOA flux.
(-2 K to +2 K).
Sea ice is fixed.
CO2 is fixed.
Measure change in TOA flux.

12. A. Broccoli, B. Soden. T. Knutson, and others

13. Cloud Feedback in AM2/Cess
(Negative FB)
Radiative Damping (W/m2/K)
(Positive FB)
p12a
B. Soden

14. Composite CMIP2 SST change
at time of CO2 doubling

15. Impact of Structured SST Change
Uniform Warming
Structured Warming

16. Change in Asian monsoon precipitation
JJA
Change in global mean surface T
CMIP
SSTs ML
CAM
P. Kushner
AM2

17. Change in S. American precipitation
DJF
Change in global mean surface T
CMIP
SSTs ML
P. Kushner
AM2
CAM

18. Change in surface Temperature
Annual mean
Change in global mean surface T
Cess ML
AM2
CAM

19. Change in zonal mean zonal wind
Annual mean
Change in global mean surface T
Cess
CMIP ML
CAM
AM2

20. Model biases Upper tropospheric/lower stratospheric temperatures
Double ITCZ
ENSO regressions (cloud forcing, flux into ocean)
Arctic surface pressures

21. Annual mean T
AM2p12b
CAMX

22. AM2p12b
CAMX

23. AM2p12b
CAMX

24. DJF
CAMX
AM2p12b