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From 18th October at 15:00UTC, our FTP server has changed from ftp://dissemination.ecmwf.int to ftp://aux.ecmwf.int
From 18th October 15:00UTC, no new data will be published on dissemination.ecmwf.int
Scope
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.
Please see the list of available atmospheric composition variables below and make sure your variables of interest are available. Should you require any additional species, please raise a request through the ECMWF Support Portal (ECMWF login required).
User accounts
To get access to CAMS global data, you need user accounts on the ECMWF website, and on the ECMWF FTP service.
- Log on to www.ecmwf.int. (If you do not have an account create one)
- Read the Licence to Use Copernicus Products and accept the license at the bottom of the page.
- Contact us by creating a ticket through the ECMWF Support Portal, providing
- the user name you used to log into www.ecmwf.int and accept the license
- for our service planning, a brief description of how you intend to use the data, and which chemical species are most relevant for you
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.
Examples:
z_cams_c_ecmf_20160704000000_prod_an_sfc_000_tchcho.grib contains analysis field of total column formaldehyde computed on 7 July 2016 at 00:00 UTC.
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_20160704120000_prod_fc_ml_012_go3.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.
Data availability
The latest model cycle based on the 00 UTC analysis is normally available by 10:00 UTC, the cycle based on 12 UTC analysis is available by 22:00 UTC.
After the data transfer to the ftp server is completed a manifest file is uploaded:
z_cams_c_ecmf_yyyymmddhhmmss_vvvv.manifest
The file is uploaded to the server only after all the data files have been successfully uploaded. The file contains a list of all the GRIB and NetCDF files in the cycle and their MD5 checksums in case you would like to verify data integrity.
List of available parameters
Data volumes per model cycle
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) | |
|---|---|---|---|---|---|---|
| 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 |