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| Info |
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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 |
|---|---|
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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z_cams_c_ ecmf_20160704000000_prod_fc_pl_012_co.grib contains all the pressure levels of +12 step CO fields from a forecast started on 7 July 2016 at 00:00 UTC.
z_cams_c_ ecmf ecmf_20160704120000_prod_fc_ml_012_go3.nc nc contains all the model levels of step 12 O3 fields from a forecast which was started on 7 July 2016 at 12:00 UTC in NetCDF format.
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The data volumes are based on the current CAMS experiment (link).
file size (GRIB / NC) | No. of fields | No. of variables | No. of files (GRIB or NC) | Total size (GRIB) | Total size (NC) | |
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| an_sfc | 1.2 MB / 800 kB | 1 | 15 | 15 | 18 MB | 12 MB |
an_pl | 30 MB / 20 MB | 25 | 16 | 24 | 697 MB | 465 MB |
| an_ml | 70 MB / 47 MB | 60 | 16 | 25 | 1,7 GB | 1,1 GB |
| fc_sfc | 1.2 MB / 800 kB | 1 | 26 | 3388 | 3,9 GB | 2,6 GB |
| fc_pl | 30 MB / 20 MB | 25 | 24 | 984 | 28 GB | 19 GB |
| fc_ml | 70 MB / 47 MB | 60 | 25 | 1025 | 68 GB | 45 GB |
| Total | 5461 | 102 GB | 68 GB |
| Info |
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This document has been produced in the context of the Copernicus 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). 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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