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).
The path to CAM6 and CESM2
- CAM6 development (post cam5.5) (updated Dec 4, 2015 )
- CAM6 development - High resolution (updated Nov 11, 2015 )
- CESM1.5 development simulation. Password requested. (updated [an error occurred while processing this directive] )
- CESM1.5 simulation (updated
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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. DOI: 10.1175/JAS-D-13-0233.1
- Park (2014) A Unified Convection Scheme, UNICON. Part II. Simulation. Journal of the Atmospheric Sciences. DOI: 10.1175/JAS-D-13-0234.1
- 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. Accepted for publication in J. Climate, [Preprint]
- Gettelman et al (2014) Advanced Two-Moment Microphysics for Global Models. Part II: Global model solutions and Aerosol-Cloud Interactions. Accepted for publication in 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.
- Dave Williamson et al. (2015). Energy considerations in the Community Atmosphere Model (CAM). Submitted to JAMES. [paper]
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 coupled simulation
CAM5-CLM4.5 coupled simulation
CAM development timelines
- CESM2 timelines (updated Oct 1, 2015 )
- CAM6 timelines (updated Oct 1, 2015 )
- CAM5.5 timelines (updated
Oct 1, 2015
Archives - Older topics
- Timings for CAM5.4 and CAM5.5 (updated Oct 1, 2015 )
- CAM6 timelines (updated 02/18/2014)
- CAM developement plan and CAM6 timelines. AMWG Discussion at the CESM Workshop, Breckenridge, 17 - 20 June 2013.