CESM Whole Atmosphere Model Working Group

The Whole Atmosphere Community Climate Model (WACCM) is a comprehensive numerical model, spanning the range of altitude from the Earth's surface to the thermosphere. The development of WACCM is an inter-divisional collaboration that unifies certain aspects of the upper atmospheric modeling of HAO, the middle atmosphere modeling of ACD, and the tropospheric modeling of CGD, using the NCAR Community Earth System Model (CESM) as a common numerical framework.

  • Science Goals
  • Publications
  • Upcoming Meetings

    WACCM Working Group Meeting
    WAWG, AMWG, PCWG, Chemistry Climate WG
    11 - 13 February 2013 at NCAR's Mesa Lab in Boulder, Colorado [agenda] [participants]
    Joint sessions are planned with Atmosphere Model, Polar Climate, and Chemistry Climate Working Groups (agenda TBD). Please submit oral contributions (title and presenter) to Mike Mills.
    Registration is now open through Friday, 25 January 2013. There is no fee to register; please register for planning purposes.
    There is a block of rooms at the Best Western Golden Buff. The group name is 'AMWG' and the group number is 47132. Please use this group name and/or number when you make your hotel reservation, so that you will receive the group rate of $64/night. You may call 303.442.7450 to make your reservation.

    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.

    WACCM Code Release

    Version 4 of the Whole Atmosphere Community Climate Model (WACCM4) is a capability of the Community Atmosphere Model (CAM), which is a component of the Community Earth System Model, (CESM). WACCM4 was first released with the public release of CESM1.0 on June 25, 2010, with several updates released subsequently. As of CESM1.0.4, released on February 21, 2012, WACCM-X is available as an option to extend the top boundary of the atmosphere model to the upper thermosphere. WACCM4 is supported for use only as a component of CESM, and not for uncoupled standalone calculations.

    Users may acquire the CESM source code by going to the CESM 1.0 or CESM 1.1 release page and clicking on "registration" under the section "Acquiring the Release Code". Once you have agreed to the terms of use, you will be sent an email containing the location of the Subversion repository along with a user name and password. The username/password can be used with Subversion client software, such as the command-line tool svn, to download the code. Detailed instructions for downloading the code are available in the User Guides for CESM 1.0 and CESM 1.1. Before downloading, please check for the latest model version (i.e. 1.0.4 or 1.1, rather than 1.0) and modify the download path accordingly.

    WACCM4 is built by selecting an appropriate WACCM component set and building the CESM as described in the User Guides for CESM 1.0 and CESM 1.1. Scripts included with the source code will automatically download the input data sets needed to run the model for the component set and horizontal grid selected by the user. WACCM may be run coupled to a full ocean (B-compsets, supported at the f19_g16 grid), or a data ocean (F-compsets, supported at the f19_f19 and f45_f45 grids). The CAM documentation for CESM1.0 and CESM1.1 include sections for WACCM in the CAM scientific description.

    A quickstart guide for building and running WACCM on NCAR's bluefire and NASA's pleiades clusters is now available for download here.

    Please check the WACCM Support Forum for known bugs, other software and run-time issues, science issues, and general announcements.

    Post-processing Analysis Tools

    GEOV is an IDL-based viewer for geophysical history files created by NCAR's CAM, WACCM and MOZART models. GEOV can be downloaded as a gzipped tarball here.

    Additional CAM diagnostic packages are described under CAM Post-Processing Utilities on the CAM documentation page. Diagnostic packages for all model components (atmosphere, land, ice, and ocean) can be found from the component post-processing utilities page.

    Validating CESM/WACCM

    Users may validate their implementation of CESM/WACCM by repeating experiments we have done at NCAR, and using the component post-processing utilities to compare the climate generated to output we have made available publicly on the Earth System Grid. Please visit our CESM 1.0 experiments and diagnostics page for an updated list of experiments with links to output data locations. Output from additional experiments will be made available on a timeline in accordance with the CMIP5 data policy.

    WACCM/CESM Tutorials and Lectures

    WAWG Mailing List

    Users are encouraged to participate in meetings of the CCSM WACCM Working Group and to sign up for our email list.

    WAWG Community Liaison:

    Dr. Michael Mills [homepage] is the WAWG Liaison.
    NCAR-ACD, P.O. Box 3000, Boulder, CO 80307-3000
    Tel: 303-497-1425, Fax: 303-497-1400, e-mail: mmills@ucar.edu

    Co-Chair Contact Information:

    Dr. Hanli Liu
    NCAR-HAO, P.O. Box 3000, Boulder, CO 80307-3000
    Tel: 303-497-1564, e-mail: liuh@ucar.edu

    Dr. Lorenzo Polvani
    Columbia University, 500 West 120th street, S.W. Mudd, Room 216, New York, NY 10027
    Tel:212-854-7331, e-mail: lmp@columbia.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).

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