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WACCM Download

WACCM results for a subset of the globe and a range of dates can be downloaded from this page. Output is provided every 6 hours. Each request is provided as a single netcdf file. We strongly recommend that you download a single day for your region to check the file size and then request a range of dates that will result in a manageable file size.

The WACCM forecasts are driven by meteorological fields from the NASA GMAO GEOS-5 model. This simulation uses anthropogenic emissions from CEDS provided for CMIP6, with emissions for 2014 used for this year. Open fire emissions are from FINN-v1 (Wiedinmyer et al., Geosci. Model Devel., 2011). The results are at 0.9x1.25 degrees with 88 levels. Each file (global for 1 day) is 8 GB: https://www.acom.ucar.edu/waccm/DATA

If you would like to be notified when WACCM forecast data is not going to be available, please subscribe to the ACOM Forecast Notification list.

For questions regarding the ACOM forecast tools or data files please subscribe and post to the ACOM Forecast Users Discussion list, which will also give you access to answers to previously asked questions.

The 'date' and 'datesec' variables contain the date and time of the WACCM output. To verify the date of the downloaded files, please use 'ncdump -v date'. The program ncview does not properly interpret the 'time' variable and calculates an erroneous date.

WACCM results are available from one year ago until 10 days from now.

Please enter your contact information in the space below:

  • Your name:
  • Affiliation:
  • Intended usage (optional):
  • E-mail:
  • Phone:

Enter the lat-lon and date bounds of the region to extract:

To specify a box that crosses the Greenwich Meridian, enter longitude values like: 340 West and 20 East (from 20W to 20E).
North latitude (-90.0 to 90.0):
West longitude (0.0 to 360.0):
East longitude (0.0 to 360.0):
South latitude (-90.0 to 90.0):

Starting date: Ending date:

Submit your data request here:

Tagged CO tracers are included in the WACCM forecasts (labeled CO01 to CO09) and are based on subsets of CO emissions:
CO01: global biomass burning
CO02: North America anthropogenic
CO03: Europe
CO04: Northern Africa
CO05: Western Asia
CO06: East Asia
CO07: South America
CO08: Southern Africa
CO09: Australia
1408 downloads since 2018-01-23.