CAM6 Development Activities
This page is intended to be a summary of the Atmosphere Model Working Group (AMWG) activities in developing the CESM Community Atmosphere Model version 6 (CAM6).
High horizontal resolution
We expect that global climate models in the next decade will run routinely at horizontal resolutions of 25 km or lower. High-resolution simulations targets simulations of tropical cyclones, improvement in important regional and mesoscale circulation, etc...
- Bacmeister et al. (2014), Exploratory High-Resolution Climate Simulations using the Community Atmosphere Model (CAM), Journal of Climate, doi: http://dx.doi.org/10.1175/JCLI-D-13-00387.1
Increased Vertical resolution
Higher vertical resolution improves the ability to represent certain aspect of physics or dynamics better (QBO, sudden stratospheric warmings, ...
- Richter et al. (2014) On the Simulation of the Quasi-Biennial Oscillation in the Community Atmosphere Model, Version 5, Accepted in JAMES, doi: 10.1002/2013JD021122. [paper]
- Richter et al. (2014) Effects of Vertical Resolution and Non-Orographic Gravity Wave Drag On the Simulated Climate in the Community Atmosphere Model, Version5 , Submitted to JAMES [paper]
- Richter (2013) Higher vertical resolution in CAM. Do we need it ?
CESM Workshop, Breckenridge, 17 - 20 June 2013. [Talk]
- Summary of Potentially level dependent physics
- Figure of the vertical levels high low
There are several Community development activities related to the improvement of the cloud physics (CLUBB, UNICON, deep convection activities).
Implement a multi-variate PDF based moist turbulence and cloud macrophysics scheme based on the Cloud Layers Unified By Binormals (CLUBB) into CAM.
- CLUBB Simulations
- Bogenschutz et al.. (2014) Recent progress and developments with CAM-CLUBB. AMWG Meeting, Boulder, 10-12 February 2014 [Talk]
- Bogenschutz et al. (2013) A unified cloud/convection scheme for CAM: Concept and preliminary results. CESM Workshop, Breckenridge, 17 - 20 June 2013. [Talk]
- Bogenschutz et al (2013). Higher-order turbulence closure and it's impact on climate simulations in the Community Atmosphere Model. J. Climate, 26, 9655-9676, doi:10.1175/JCLI-D-13-00075.1. [Paper]
- Bogenschutz et al (2012). Unified parameterization of the planetary boundary layer and shallow convection with a higher-order turbulence closure in the Community Atmosphere Model. Geo. Sci. Model Dev., 5, 1407-1423, doi: 10.5194/gmd-5-1407-2012 [Paper].
A unified convection scheme for CAM that unifies treatment of deep and shallow convection.
- Park (2014) A Unified Convection Scheme, UNICON. Part I. Formulation. Journal of the Atmospheric Sciences. Revised.
- Park (2014) A Unified Convection Scheme, UNICON. Part II. Simulation 2014. Journal of the Atmospheric Sciences. Revised.
- Park (2014), An update on the CAM Unified Convection Scheme (UNICON), 10-12 February 2014 [Talk]
- Park (2013). Scale-adaptive physics parameterization. CESM Workshop, Breckenridge, 17 - 20 June 2013 [Talk].
Modifications of the Zhang McFarlane scheme for short-term tuning of CAM5 high resolution simulations.
Next generation of MG microphysics.
Includes prognostic precipitation, mixed phase ice nucleation and convective microphysics.
- MG2 Simulations
- Gettelman et al (2014) Advanced Two-Moment Microphysics for Global Models. Part I: Off line tests and comparisons with other schemes. Submitted to J. Climate, [Preprint]
- Gettelman et al (2014) Advanced Two-Moment Microphysics for Global Models. Part II: Global model solutions and Aerosol-Cloud Interactinos. Submitted to J. Climate [Preprint]
New ice nucleation
Mixed-phase cloud ice nucleation + Refinement of ice nucleation treatment in cirrus clouds
- Ice nucleation Simulation
- Wang el al (2014) Impact of heterogeneous ice nucleation by natural dust and soot based on a probability density function of contact angle model with the Community Atmospheric Model version 5, Atmos. Chem. Phys. Discuss, 14, 7141-7186, doi:10.5194/acpd-14-7141-2014
- English et al (2014): Contributions of clouds, surface albedos, and mixed-ph ase ice nucleation schemes to Arctic radiation biases in CAM5. J. Climate. doi:10.1175/JCLI-D-13- 00608.1
- Shi et al. (2014): Effects of preexisting ice crystals on cirrus clouds and comparison between different ice nucleation parameterizations with the Community Atmosphere Model (CAM5), Submitted to Atmos. Chem. Phys. Discuss [manuscript].
Gravity Wave Drag (GWD) and Turbulent Mountain Stress (TMS)
Development targets Gravity Wave Drag (GWD) and Turbulent Mountain Stress (TMS) schemes.
- Gunilla Svensson. The Effects of Turbulent Mountain Stress (TMS) on the Boundary Layer in CAM. AMWG meeting. Boulder, 14-16 February 2011
Development targets are MAM4 and prescribed MAM.
MAM4 includes a primary carbon mode and improves the simulation of black carbon at high-latitudes.
- Steve Ghan. MAM4 Status and development of aerosol branch CESM Workshop, Breckenridge, 17 - 20 June 2013.
Energy formulation in CAM
An error in the energy formulation in CAM is identified and corrected.
Ocean spunup issue in CESM
We look at spinup issue with the Spectral Element dycore
- Ocean Spunup Simulations
- Cécile Hannay, Rich Neale, Joe Tribbia, Keith Lindsay and Gokhan Danabasoglu (2014), Coupled Simulations with CAM5.3. Ocean Spinup in CESM: Is it dycore dependant ? Atmosphere Model Working Group (AMWG) Meeting, Boulder, 10-12 February, 2014 [Talk]
Spectral element coupled simulation
Archives - Older topics
- CAM6 timelines (updated 02/18/2014)
- CAM developement plan and CAM6 timelines. AMWG Discussion at the CESM Workshop, Breckenridge, 17 - 20 June 2013.