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Test data is available from 1 September 2022 onwards from the MARS archive. A daily updated test dataset is also available for the most recent 3 days on the FTP server. 

MARS

If you have access to ECMWF systems you can retrieve test data from MARS archive using keywords:

class=mc
expver=0078

Please note that ecCodes version 2.28.0 or later is required to handle the full range of parameters from this cycle

Atmosphere Data Store (ADS)

If you don't have access to ECMWF computers but would still like to access a large subset of test data you can use ECMWF WebAPI service.

Read documentation and see brief request syntax of the ECMWF WebAPI service.

If you haven't done it yet you will need to create an ECMWF web account and accept the data licence (broken link)

Example

Total aerosol optical depth at 550 nm in NetCDF format, only European domain, 10 dates, day 1 forecast (broken link in code example)

NetCDF
#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()

server.retrieve({
    "dataset":   "cams-global-atmospheric-composition-forecasts-test",
    "stream":    "oper",
    "type":      "fc",
    "date":      "20230301/to/20230310",
    "time":      "00",    
    "step":      "0/to/23/by/1",
    "levtype":   "sfc",
    "format":    "netcdf",
    "param" :    "aod550",         # see parameter table at http://atmosphere.copernicus.eu/ftp-access-global-data (broken link)
    "grid":      "0.4/0.4",        # 0.4 x 0.4 regular lat-lon grid
    "area":      "70/-35/35/60",   # N/E/S/W area boundaries
    "target":    "/tmp/cams_test_20230301_10.nc"
})

FTP dissemination

The test dataset is available through ECPDS FTP dissemination systems in these directories:

/DATA/CAMS_GLOBAL_TEST
/DATA/CAMS_GLOBAL_ADDITIONAL_TEST
/DATA/CAMS_EUROPE_BC_TEST

You can use your normal FTP account to access the data. Details about filenames convention or list of available parameters can be found at Copernicus Knowledge Base.

If everything else fails ...

... you can always contact us by sending an email to copernicus-support@ecmwf.int putting "Request for CAMS global test dataset" as a subject and specify:

  • which parameters and levels
  • which time period
  • forecast step / time frequency
  • which geographical area
  • which data format you require
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