CCSM Atmosphere Model Working Group Meeting

20-22 March 2006

NCAR, Boulder, Colorado




Monday, 20 March 2006 – Main Seminar Room


8:00 a.m Continental Breakfast 


8:30-9:15 a.m. 

Current status of the development versions of CAM (Rasch)

Presentation of the deadlines and schedules required to produce the next generation of CAM

Requests for suggestions from the audience on how to make progress more rapidly and equitably in developing the next generation CAM 

Update on CAM/CCSM Software Engineering (Vertenstein)

9:15-10:00 a.m. 

New metrics and means of evaluating CAM

Use of short-term climate drifts and forecasts as a tool in guiding the development of CAM

Short-term forecasts (Klein)

Changes in clouds/radiation (Norris)

10:00-10:30 a.m. Break


10:30-11:30 a.m.

Status of next generation component candidates

UW-PBL and shallow convection scheme (Bretherton)

COURT (Collins)

Subgridscale orography (Ghan)

Convection (Neale)

11:30-1:00 p.m. Lunch


1:00-3:00 p.m. 

Exploration of dynamical cores

New adiabatic test case (Jablonowski)

CSU icosohedral dynamical core (Randall)

FV non-hydrostatic core (Lin)

3:00-3:15 p.m.  Break


3:15-5:00 p.m. 

Continuing exploration of dynamical cores 

Isentropic FV core (Chen)

DG core (Nair)

Coupled FV simulations at one-degree resolution (Mirin)


Tuesday, 21 March 2006 (Main Seminar Room)


8:00 a.m.  Continental Breakfast 


8:30 a.m.  General Theme:  Parameterization

8:30-8:45 a.m. Treating subgrid-scale cloud structure in radiation (and other) calculations in CAM (Pincus) 

8:45-9:00 a.m. Further improvement to the convection scheme in NCAR CCSM (Wu)

9:00-9:15 a.m. An update on testing modifications in CAM3 convection parameterization: Results from coupled model simulations (Zhang)

9:15-9:30 a.m. Relaxed Arakawa-Schubert (RAS) convection parameterization as implemented in the NCAR CAM3 (Maloney)

9:30-9:45 a.m.  Model-consistent generation of gravity waves (Sassi)

9:45-10:00 a.m. Prediction of ice-crystal number concentration (Liu)

10:00-10:15 a.m. Open discussion


10:15 a.m.  Break


10:30 a.m.  Comparisons of CAM and observations

10:30-10:45 a.m. Precipitation and cloud structure in mid-latitude cyclones (Field)

10:45-11:15 a.m. Diagnostics of cloud variations in observations and models (Norris)

11:15-11:30 a.m. Open discussion


11:30-1:00 p.m. Lunch


1:00 p.m.  General Theme:  Assimilation

1:00-1:15 p.m. Recent improvements in the Data Assimilation Research Testbed and current activities using DART-CAM (Raeder)

1:15-1:30 p.m. Chemical data assimilation using CAM-Chem and DART: Tests with CO remote-sensed measurements (Arellano)

1:30-1:45 p.m.  CPT Report (Bretherton)


1:45-2:00 p.m. Representation of subgrid cloud-radiation interaction and its impact on global climate simulations (Wu)

2:00-2:30 p.m. Ocean-atmosphere interactions (Jochum)

Coupled FV Simulations (Neale)


2:30-3:15 p.m.  Open discussion

3:30-4:30 p.m. CGD Seminar, invited talk by Vince Larson entitled "Parameterizating cloud layers and their microphysics"


Wednesday, 22 March 2006 (Main Seminar Room)



8:00 a.m.  Continental Breakfast


8:30 a.m.  Short introductions for people joining from Chemistry-Climate Working Group


8:45-10:30 a.m. Microphysics Session

 - Summary of the November 2005 Microphysics Workshop (Gettelman)

 - Progress in implementing detailed microphysics in CAM3:  Scheme description and single column model tests (Morrison)

- First global tests and timing (Neale/Gettelman)

 - Next Steps and plans for coupling with other model components: Radiation, convection, aerosols

 - Discussion


10:30-10:45 a.m. Break


10:45-11:45 a.m. Scavenging

  - Lead-210 and beryllium-7 simulations with the new GFDL global atmosphere model AM2 (H. Liu)

 - Discussion: (Possible discussion points:  How do we represent scavenging in light of the microphysics/convection parameterizations? Do the microphysics and convective parameterizations include the necessary complexity to formulate the scavenging?  Should convective scavenging be handled within the convective parameterization?)


11:45-1:00 p.m. Lunch 


1:00-2:30 pm  Aerosols

   - Current status of aerosol scheme (Rasch)

   - Proposed aerosol treatment for CAM4 (Ghan)

   - SOA in CAM (Heald)

   - An interactive aerosol-climate model based on CAM/CCSM:  Current progress and challenging issues (Wang, Toon)

   - White paper on aerosols (Ghan)


2:30-2:45 pm  Break


2:45-4:00 p.m. Aerosol Discussion (Possible discussion points: Discussion of White Paper, indirect effect in light of the microphysics schemes, simple vs. complex aerosol schemes; how to treat chemistry and oxidants; representation of SOAs and Ammonia nitrate aerosols with simple chemistry; internally versus externally mixed aerosols; proposed experiments and future development.)


4:00-5:00 pm.   Discussion: Other issues in common to the Atmosphere and Chemistry-Climate Working Groups (Possible discussion points: chemistry as a diagnostic for CAM, boundary layer venting, convection, cooperative projects between the working groups.)