ChemistryClimate Working Group Update JeanFranois Lamarque NCAR Changes

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

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

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

Upcoming release(s): new features • Implementation of full chemistry with MAM 3/MAM 7 (new compsets) • Expanded representation of secondary organic aerosols (in BAM), including a more speciated representation of biogenic emissions (MEGAN 2. 1) • Speciated dust and improved refractive index • MAM 4 (MAM 3+fresh carbon mode) • Improved arctic aerosol concentrations

Participation in ACCMIP • Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) in support of CMIP 5 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.

Participation in Aero. Com 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

SPCAM with Cloud-aerosol Interactions • Morrison double-moment cloud microphysics in embedded cloud-resolving model coupled with CAM 5 MAM aerosol • Cloud effects on aerosol driven by cloud statistics from CRM • Provides guidance for reduced aerosol indirect effect in CAM 5 • Going on trunk in next few months

Future work: int’l efforts • Geo. MIP: 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)

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)

Ongoing/Future work: development (2) SPCAM with Cloud-Aerosol Interactions CAM 5 with modal aerosols Two-moment cloud microphysics MMF Wang et al. , GMD, 2011 Wang et al. , ACP, 2011 CRM cloud/precipitation statistics used for cloud processing of aerosols

Future work: production • CAM 5 -chem under various conditions/forcings • Regional impact of regional emissions (attribution) Teng et al. , GRL, 2012 • Biogeochemical cycles (methane)