CESM Chemistry Climate Working Group

The goal of the Chemistry-Climate WG is to continue the development of the representation of chemical gas and aerosol species in the CESM and to further our understanding of the interactions between chemistry/aerosol and climate. Scientific motivations include advancing knowledge on past, present and future atmospheric composition, interactions between atmospheric composition and the Earth System, stratosphere-troposphere coupling, aerosol direct and indirect effects on the Earth's energy balance, aerosol effects on precipitation, and impacts of global chemistry/aerosol and climate on air quality.

The chemistry and aerosol are now fully incorporated into the CESM, e.g. Options for super-fast chemistry, full troposphere chemistry, bulk aerosol, and modal aerosol that fully interact with the clouds and radiation. CAM was used extensively to perform 1850-2100 (all RCPs) simulations to define atmospheric composition (and deposition fields) for use in CCSM4. CAM can also be run as an offline version using GEOS5 and MERRA data to support aircraft campaigns and other observations and with stratospheric chemistry.

Upcoming Meetings

Chemistry Climate Working Group Meeting
WAWG, AMWG, PCWG, Chemistry Climate WG
11 - 13 February 2013, NCAR, Boulder, CO [agenda] [participants]
Joint sessions are planned with the Whole Atmosphere, Atmosphere Model and Polar Climate Working Groups. Please submit your contributions (title and presenter) to Simone Tilmes. This time, we also want to especially motivate contributions on topics around aerosols in CAM and CAM-Chem.

19th Annual CESM Workshop

The 19th Annual CESM Workshop at The Village at Breckenridge, Breckenridge, CO, 16 - 19 June 2014.


Review archives of past meeting agendas, reports, and presentations.

Topics of Development and Research

  • testing the representation of chemistry and aerosols in CESM and evaluating existing and forthcoming CAM configurations, see Development Plans. These configurations include:
  1. CAM5 physics, especially the coupling of interactive gas-phase chemistry and the modal aerosols and the impact of the new planetary-boundary layer;
  2. improved modeling capabilities for new chemistry to allow for better process understanding. Current applications include isoprene oxidation mechanisms and tropospheric halogen chemistry.
  3. improved modelling capabilities for different dynamical cores and horizontal resolutions

Community Support

  • contributions to CCMVal2/3 , GeoMIP, POLMIP, CMIP5, ACC-MIP.
  • offline modeling in support of field campaigns (e.g., INTEX-B, POLARCAT).

User Support

ChemClim-WG Community Liaison:

Simone Tilmes is the ChemClim-WG Liaison. [email]

Po-Lun Ma is the Aerosol Liaison. [email]

Co-Chair Contact Information:

Dr. Steven Ghan
Pacific Northwest National Laboratory, PO Box 999, Richland WA 99352
Tel: 509-372-6169, Fax: 509-372-6168, e-mail: Steve.Ghan@pnnl.gov

Dr. Peter G. Hess
Cornell University, 2140 Snee Hall, Department of Earth and Atmospheric Sciences, Ithaca, NY 14853
e-mail: pgh25@cornell.edu

Dr. Jean-Francois Lamarque
NCAR-ACD, P.O. Box 3000, Boulder, CO 80307-3000
Tel: 303-497-1495, Fax: 303-497-1700, e-mail: lamar@ucar.edu

CESM Project

The Community Earth System Model (CESM) is a fully-coupled, global climate model that provides state-of-the-art computer simulations of the Earth's past, present, and future climate states.

CESM is sponsored by the National Science Foundation (NSF) and the U.S. Department of Energy (DOE). Administration of the CESM is maintained by the Climate and Global Dynamics Division (CGD) at the National Center for Atmospheric Research (NCAR).


Contact Information

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