1. Chemistry-Climate Working Group Update
Jean-François Lamarque (NCAR)

2. Changes in co-chairs
Input from community at the 2012 Breckenridge meeting on having aerosols more prominently represented in ChemClimWG
Bringing Steve Ghan (PNNL) as third co-chair (with Peter Hess, Cornell), replacing Arlene Fiore (Lamont-Doherty/Columbia)
Spring meeting with AMWG/WAWG/PolarWG

3. Additional support
DOE is bringing funds to support ½ of an aerosol liaison (Po-Lun Ma), to be housed at PNNL (but with frequent visits/interactions with NCAR)
First tasks include documentation of MAM code and usage and diagnostics

4. Upcoming release(s): new features
Implementation of full chemistry with MAM3/MAM7 (new compsets)
Expanded representation of secondary organic aerosols (in BAM), including a more speciated representation of biogenic emissions (MEGAN2.1)
Speciated dust and improved refractive index
MAM4 (MAM3+fresh carbon mode)
Improved arctic aerosol concentrations

5. Participation in ACCMIP
Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) in support of CMIP5 simulations for the definition of radiative forcings.
7 papers submitted on ACPD
Additional papers in preparation include nitrogen/sulfate deposition, air quality and agriculture impact.

6. Participation in AeroCom II: BAM and MAM
New aerosol diagnostic fields
Journal article submissions and manuscripts in preparation
Aerosol direct effects
Aerosol direct radiative forcing efficiency
Aerosol microphysics
Organic aerosol
Aerosol vertical distribution
Aerosol indirect effects

7. SPCAM with Cloud-aerosol Interactions
Morrison double-moment cloud microphysics in embedded cloud-resolving model coupled with CAM5 MAM aerosol
Cloud effects on aerosol driven by cloud statistics from CRM
Provides guidance for reduced aerosol indirect effect in CAM5
Going on trunk in next few months

8. Future work: int’l efforts
GeoMIP: look at chemical impacts of Solar Radiation Management
Hindcast experiment: focus on 1960-present reconstruction of tropospheric and stratospheric changes in atmospheric composition (led by P. Hess)

9. Ongoing/Future work: development (1)
High resolution
Sub-column and scale-aware parameterizations
GPU acceleration (collaboration with ORNL)
Testing transport in SE/FV (DOE proposal funded)

10. SPCAM with Cloud-Aerosol Interactions
Ongoing/Future work: development (2)
SPCAM with Cloud-Aerosol Interactions
Two-moment cloud microphysics
CAM5 with modal aerosols
MMF
Going on trunk in next few months
Wang et al., GMD, 2011
Wang et al., ACP, 2011
CRM cloud/precipitation statistics used for cloud processing of aerosols

11. Future work: production
CAM5-chem under various conditions/forcings
Regional impact of regional emissions (attribution)
Biogeochemical cycles (methane)
Teng et al., GRL, 2012