Last modified on Jan 22, 2024 15:31

Table of Contents

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
1. the user name you used to log into www.ecmwf.int and accept the license
2. 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
`grib, nc`	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 format

Model level fields are in GRIB2 format. All other fields are in GRIB1, except for new parameters from cycle 48r1 (more details are available here). NetCDF format is also available.

From cycle 48R1, there are important changes to the GRIB encoding for model levels fields, relating to packing and GRIB tables. Please see this page for full details: Implementation of IFS cycle 48r1 for CAMS#ChangetoGRIBencoding

The 'packingType' can be changed using ECMWF's ecCodes:

# CCSDS -> simple

grib_set -r -s packingType=grid_simple in.grib2 out.grib

# Simple -> CCSDS

grib_set -r -s packingType=grid_ccsds in.grib out.grib2

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

short name	parameter ID	name	type of variable	type of data (an,fc)	type of level (sfc,pl,ml)
aod1240	210216	Total Aerosol Optical Depth at 1240nm	vertically-integrated	an + fc	sfc
aod469	210213	Total Aerosol Optical Depth at 469nm	vertically-integrated	an + fc	sfc
aod550	210207	Total Aerosol Optical Depth at 550nm	vertically-integrated	an + fc	sfc
aod670	210214	Total Aerosol Optical Depth at 670nm	vertically-integrated	an + fc	sfc
aod865	210215	Total Aerosol Optical Depth at 865nm	vertically-integrated	an + fc	sfc
bcaod550	210211	Black Carbon Aerosol Optical Depth at 550nm	vertically-integrated	an + fc	sfc
duaod550	210209	Dust Aerosol Optical Depth at 550nm	vertically-integrated	an + fc	sfc
omaod550	210210	Organic Matter Aerosol Optical Depth at 550nm	vertically-integrated	an + fc	sfc
ssaod550	210208	Sea Salt Aerosol Optical Depth at 550nm	vertically-integrated	an + fc	sfc
soaod550	215226	Secondary organic aerosol optical depth at 550 nm	vertically-integrated	an + fc	sfc
suaod550	210212	Sulphate Aerosol Optical Depth at 550nm	vertically-integrated	an + fc	sfc
niaod550	210250	Nitrate aerosol optical depth at 550 nm	vertically-integrated	an + fc	sfc
amaod550	210251	Ammonium aerosol optical depth at 550 nm	vertically-integrated	an + fc	sfc
pm1	210072	Particulate matter d < 1 um	surface concentration	fc	sfc
pm10	210074	Particulate matter d < 10 um	surface concentration	fc	sfc
pm2p5	210073	Particulate matter d < 2.5 um	surface concentration	fc	sfc
aermr01	210001	Sea Salt Aerosol (0.03 - 0.5 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr02	210002	Sea Salt Aerosol (0.5 - 5 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr03	210003	Sea Salt Aerosol (5 - 20 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr04	210004	Dust Aerosol (0.03 - 0.55 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr05	210005	Dust Aerosol (0.55 - 0.9 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr06	210006	Dust Aerosol (0.9 - 20 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr07	210007	Hydrophilic Organic Matter Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr08	210008	Hydrophobic Organic Matter Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr09	210009	Hydrophilic Black Carbon Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr10	210010	Hydrophobic Black Carbon Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr11	210011	Sulphate Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr16	210247	Nitrate fine mode aerosol mass mixing ratio	concentration in air	an + fc	ml + pl
aermr17	210248	Nitrate coarse mode aerosol mass mixing ratio	concentration in air	an + fc	ml + pl
aermr18	210249	Ammonium aerosol mass mixing ratio	concentration in air	an + fc	ml + pl
aermr01	210001	Sea Salt Aerosol (0.03 - 0.5 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr02	210002	Sea Salt Aerosol (0.5 - 5 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr03	210003	Sea Salt Aerosol (5 - 20 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr04	210004	Dust Aerosol (0.03 - 0.55 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr05	210005	Dust Aerosol (0.55 - 0.9 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr06	210006	Dust Aerosol (0.9 - 20 um) Mixing Ratio	concentration in air	an + fc	ml + pl
aermr07	210007	Hydrophilic Organic Matter Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr08	210008	Hydrophobic Organic Matter Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr09	210009	Hydrophilic Black Carbon Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr10	210010	Hydrophobic Black Carbon Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr11	210011	Sulphate Aerosol Mixing Ratio	concentration in air	an + fc	ml + pl
aermr16	210247	Nitrate fine mode aerosol mass mixing ratio	concentration in air	an + fc	ml + pl
aermr17	210248	Nitrate coarse mode aerosol mass mixing ratio	concentration in air	an + fc	ml + pl
aermr18	210249	Ammonium aerosol mass mixing ratio	concentration in air	an + fc	ml + pl
aermr19	210252	Biogenic secondary organic aerosol mass mixing ratio	concentration in air	an + fc	ml + pl
aermr20	210253	Anthropogenic secondary organic aerosol mass mixing ratio	concentration in air	an + fc	ml + pl

short name	parameter ID	name	type of variable	type of data (an,fc)	type of level (pl,sfc,ml)
gtco3	210206	GEMS Total column ozone	vertically-integrated	an +fc	sfc
tc_c2h6	218045	Total column ethane	vertically-integrated	an +fc	sfc
tc_c3h8	218047	Total column propane	vertically-integrated	an +fc	sfc
tc_c5h8	218016	Total column isoprene	vertically-integrated	an +fc	sfc
tc_ch4	218004	Total column methane	vertically-integrated	an +fc	sfc
tc_hno3	218006	Total column nitric acid	vertically-integrated	an +fc	sfc
tc_no	218027	Total column nitrogen monoxide	vertically-integrated	an +fc	sfc
tc_oh	218030	Total column hydroxyl radical	vertically-integrated	an +fc	sfc
tc_pan	218013	Total column peroxyacetyl nitrate	vertically-integrated	an +fc	sfc
tcco	210127	Total column Carbon monoxide	vertically-integrated	an +fc	sfc
tchcho	210128	Total column Formaldehyde	vertically-integrated	an +fc	sfc
tcno2	210125	Total column Nitrogen dioxide	vertically-integrated	an +fc	sfc
tcso2	210126	Total column Sulphur dioxide	vertically-integrated	an +fc	sfc
tc_h2o2	218003	Total Column Hydrogen Peroxide	vertically-integrated	an + fc	sfc
tc_glyoxal	218107	Total column of glyoxal	vertically-integrated	an + fc	sfc
tc_clo	218174	Total column of chlorine monoxide	vertically-integrated	an + fc	sfc
tc_clono2	218064	Total column of chlorine nitrate	vertically-integrated	an + fc	sfc
tc_hcl	218200	Total column hydrogen chloride	vertically-integrated	an + fc	sfc
tc_HCN	218226	Total column hydrogen cyanide	vertically-integrated	an + fc	sfc
c2h6	217045	Ethane	concentration in air	an +fc	ml + pl
c3h8	217047	Propane	concentration in air	an +fc	ml + pl
c5h8	217016	Isoprene	concentration in air	an +fc	ml + pl
ch4_c	217004	Methane (chemistry)	concentration in air	an +fc	ml + pl
co	210123	Carbon monoxide	concentration in air	an +fc	ml + pl
go3	210203	GEMS Ozone	concentration in air	an +fc	ml + pl
hcho	210124	Formaldehyde	concentration in air	an +fc	ml + pl
hno3	217006	Nitric acid	concentration in air	an +fc	ml + pl
no	217027	Nitrogen monoxide	concentration in air	an +fc	ml + pl
no2	210121	Nitrogen dioxide	concentration in air	an +fc	ml + pl
oh	217030	Hydroxyl radical	concentration in air	an +fc	ml + pl
pan	217013	Peroxyacetyl nitrate	concentration in air	an +fc	ml + pl
so2	210122	Sulphur dioxide	concentration in air	an + fc	ml + pl
h2o2	217003	Hydrogen Peroxide	concentration in air	an + fc	ml + pl
c2h6	217045	Ethane	concentration in air	an + fc	ml + pl
c3h8	217047	Propane	concentration in air	an + fc	ml + pl
c5h8	217016	Isoprene	concentration in air	an + fc	ml + pl
ch4_c	217004	Methane (chemistry)	concentration in air	an + fc	ml + pl
co	210123	Carbon monoxide	concentration in air	an + fc	ml + pl
go3	210203	GEMS Ozone	concentration in air	an + fc	ml + pl
hcho	210124	Formaldehyde	concentration in air	an + fc	ml + pl
glyoxal	217107	Glyoxal	concentration in air	an + fc	ml + pl
hno3	217006	Nitric acid	concentration in air	an + fc	ml + pl
no	217027	Nitrogen monoxide	concentration in air	an + fc	ml + pl
no2	210121	Nitrogen dioxide	concentration in air	an + fc	ml + pl
oh	217030	Hydroxyl radical	concentration in air	an + fc	ml + pl
pan	217013	Peroxyacetyl nitrate	concentration in air	an + fc	ml + pl
so2	210122	Sulphur dioxide	concentration in air	an + fc	ml + pl
h2o2	217003	Hydrogen Peroxide	concentration in air	an + fc	ml + pl
clo	217174	Chlorine monoxide	concentration in air	an + fc	ml + pl
clono2	217064	Chlorine nitrate	concentration in air	an + fc	ml + pl
hcl	217200	Hydrogen chloride	concentration in air	an + fc	ml + pl
HCN	217226	Hydrogen cyanide	concentration in air	an + fc	ml + pl

short name	parameter ID	name	type of variable	type of data (an,fc)	type of level (pl,sfc,ml)
lsm	172	Land-sea mask	2D parameter	an	sfc
z	129	Geopotential	2D parameter	an	sfc
uvbed	214002	UV biologically effective dose	2D parameter	fc	sfc
uvbedcs	214003	UV biologically effective dose clear-sky	2D parameter	fc	sfc
den	3089	Density	3D parameter	an + fc	pl
den	3089	Density	3D parameter	an + fc	ml
lnsp	152	Logarithm of surface pressure	2D parameter	an + fc	ml
z	129	Geopotential	2D parameter	fc	ml
q	133	Specific humidity	3D parameter	fc	ml
t	130	Temperature	3D parameter	fc	ml
u	131	U-component of wind	3D parameter	fc	ml
v	132	V-component of wind	3D parameter	fc	ml
w	135	Vertical velocity	3D parameter	fc	ml

Data volumes per model cycle

The data volumes are based on the current CAMS experiment (link) and for guidance only.

Due to the new compression method used, the GRIB file sizes vary much more than before. In 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)
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

_{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 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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Scope

User accounts

Data location

File naming convention

Data organisation

Data format

Data availability

List of available parameters

Data volumes per model cycle

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Space shortcuts

Page tree

FTP access to CAMS global data

Scope

User accounts

Data location

File naming convention

Data organisation

Data format

Data availability

List of available parameters

Data volumes per model cycle

Related articles