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The ECMWF FTP service provides access to real-time data from the CAMS global atmospheric composition system. For product documentation please see here. For a description of the current global model please see here (including information on system upgrades) . For other data access options please see here.
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Please note that the default limit per user is 10 active connections to the FTP server. There is also an overall limit across all users of 2,000 active connections. |
Data location
FTP server | ftp://aux.ecmwf.int |
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Data directories | /DATA/CAMS_GLOBAL/${YYYYMMDDhh} |
| /DATA/CAMS_GLOBAL_ADDITIONAL which contains individual files of surface level fields (model level 137). | |
| /DATA/CAMS_GLOBAL_TEST/ which contains test data files | |
Retention policy | Forecast are kept for 3 days |
File naming convention
The file naming convention is based on WMO guidelines as follows:
z_cams_c_ecmf_yyyymmddhhmmss_vvvv_tt_lt_sss_param.[grib|nc]
Where:
ecmf | is the WMO location indicators. The list can be found here. |
yyyymmddhhmmss | is the base date and time of the forecast. |
vvvv | is a version or experiment identifier. prod will be used for operational products, test (or experiment ID) will be used for testing purposes, rean for reanalysis if needed. |
tt | type of data, fc - forecast, an - analysis |
lt | is the type of level. pl for pressure level products, sfc for surface fields, ml for model level fields |
sss | is the forecast hour time step. For accumulation and averages, it is the end time. This number must be zero padded to 3 digits, e.g. step 24 is given as 024 |
param | is the parameter short name as defined here |
| is the format of a file, GRIB or NETCDF |
Data organisation
The dataset is grouped by type of product (analysis or forecast), level type (surface parameter, pressure level or model level), by step or forecast range and by parameter.
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Due to the new compression method used, the GRIB file sizes vary much more than before. I this table the numbers are averages. * Please be aware that, the total volume will vary from one model run to the next one. |
| average file size (GRIB / NC) | No. of fields per file | No. of variables | No. of files (GRIB or NC) | Total size (GRIB) | Total size (NC) | |
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| an_ml | ~ 82 MB/144 MB | 137 | 33 | 33 | ~ 3 GB | 4.6 GB |
| an_pl | ~ 28 MB/28 MB | 25 | 32 | 32 | ~ 881 MB | 899 MB |
| an_sfc | ~ 1 MB/1.3 MB | 1 | 30 | 30 | ~ 33 MB | 38 MB |
| fc_ml | ~ 77 MB/44 MB | 137 | 39 | 1599 | ~ 120 GB | 68 GB |
| fc_pl | ~ 28 MB/8.3 MB | 25 | 32 | 1312 | ~ 35 GB | 10.7 GB |
| fc_sfc | ~ 1 MB/435 kB | 1 | 33 | 3993 | ~ 4 GB | 1.7 GB |
| Totals | 6999 | 163 GB* | 87 GB |
| Info | ||
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This document has been produced in the context of theCopernicus Atmosphere Monitoring Service (CAMS). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of CAMS on behalf of the European Union (Delegation Agreement signed on 11/11/2014 and Contribution Agreement signed on 22/07/2021). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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