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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. Please contact us if you require any additional species.

User accounts

To get access to CAMS global data, you need user accounts on the ECMWF website, and on the ECMWF FTP service.

  1. Log on to www.ecmwf.int. (If you do not have an account create one)
  2. Read the CAMS data licence and accept the license at the bottom of the page.
  3. Send an email to copernicus-support@ecmwf.int, 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

Data location

FTP server

ftp://dissemination.ecmwf.int

Data directory

/DATA/CAMS_GLOBAL/${YYYYMMDDhh}

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 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

  •  Aerosol
    short nameparameter IDnametype of variabletype of data (an,fc)type of level (pl,sfc,ml)
    aod1240210216Total Aerosol Optical Depth at 1240nmvertically-integrated an + fc sfc
    aod469210213Total Aerosol Optical Depth at 469nmvertically-integrated an + fc sfc
    aod550210207Total Aerosol Optical Depth at 550nmvertically-integrated an + fc sfc
    aod670210214Total Aerosol Optical Depth at 670nmvertically-integrated an + fc sfc
    aod865210215Total Aerosol Optical Depth at 865nmvertically-integrated an + fc sfc
    bcaod550210211Black Carbon Aerosol Optical Depth at 550nmvertically-integrated an + fc sfc
    duaod550210209Dust Aerosol Optical Depth at 550nmvertically-integrated an + fc sfc
    omaod550210210Organic Matter Aerosol Optical Depth at 550nmvertically-integrated an + fc sfc
    ssaod550210208Sea Salt Aerosol Optical Depth at 550nmvertically-integrated an + fc sfc
    suaod550210212Sulphate Aerosol Optical Depth at 550nmvertically-integrated an + fc sfc
    niaod550210250Nitrate aerosol optical depth at 550 nmvertically-integratedan + fc sfc
    amaod550210251Ammonium aerosol optical depth at 550 nmvertically-integratedan + fc sfc
    pm1210072Particulate matter d < 1 umsurface concentration
    fcsfc
    pm10210074Particulate matter d < 10 umsurface concentration
    fcsfc
    pm2p5210073Particulate matter d < 2.5 umsurface concentration
    fcsfc
    aermr01210001Sea Salt Aerosol (0.03 - 0.5 um) Mixing Ratioconcentration in airan + fcpl
    aermr02210002Sea Salt Aerosol (0.5 - 5 um) Mixing Ratioconcentration in airan + fcpl
    aermr03210003Sea Salt Aerosol (5 - 20 um) Mixing Ratioconcentration in airan + fcpl
    aermr04210004Dust Aerosol (0.03 - 0.55 um) Mixing Ratioconcentration in airan + fcpl
    aermr05210005Dust Aerosol (0.55 - 0.9 um) Mixing Ratioconcentration in airan + fcpl
    aermr06210006Dust Aerosol (0.9 - 20 um) Mixing Ratioconcentration in airan + fcpl
    aermr07210007Hydrophilic Organic Matter Aerosol Mixing Ratioconcentration in airan + fcpl
    aermr08210008Hydrophobic Organic Matter Aerosol Mixing Ratioconcentration in airan + fcpl
    aermr09210009Hydrophilic Black Carbon Aerosol Mixing Ratioconcentration in airan + fcpl
    aermr10210010Hydrophobic Black Carbon Aerosol Mixing Ratioconcentration in airan + fcpl
    aermr11210011Sulphate Aerosol Mixing Ratioconcentration in airan + fcpl
    aermr16210247Nitrate fine mode aerosol mass mixing ratioconcentration in airan + fcpl
    aermr17210248Nitrate coarse mode aerosol mass mixing ratioconcentration in airan + fcpl
    aermr18210249Ammonium aerosol mass mixing ratioconcentration in airan + fcpl
    aermr01210001Sea Salt Aerosol (0.03 - 0.5 um) Mixing Ratioconcentration in airan + fc ml
    aermr02210002Sea Salt Aerosol (0.5 - 5 um) Mixing Ratioconcentration in airan + fc ml
    aermr03210003Sea Salt Aerosol (5 - 20 um) Mixing Ratioconcentration in airan + fc ml
    aermr04210004Dust Aerosol (0.03 - 0.55 um) Mixing Ratioconcentration in airan + fc ml
    aermr05210005Dust Aerosol (0.55 - 0.9 um) Mixing Ratioconcentration in airan + fc ml
    aermr06210006Dust Aerosol (0.9 - 20 um) Mixing Ratioconcentration in airan + fc ml
    aermr07210007Hydrophilic Organic Matter Aerosol Mixing Ratioconcentration in airan + fc ml
    aermr08210008Hydrophobic Organic Matter Aerosol Mixing Ratioconcentration in airan + fc ml
    aermr09210009Hydrophilic Black Carbon Aerosol Mixing Ratioconcentration in airan + fc ml
    aermr10210010Hydrophobic Black Carbon Aerosol Mixing Ratioconcentration in airan + fc ml
    aermr11210011Sulphate Aerosol Mixing Ratioconcentration in airan + fc ml
    aermr16210247Nitrate fine mode aerosol mass mixing ratioconcentration in airan + fcml
    aermr17210248Nitrate coarse mode aerosol mass mixing ratioconcentration in airan + fcml
    aermr18210249Ammonium aerosol mass mixing ratioconcentration in airan + fcml
  •  Gases
    short nameparameter IDnametype of variabletype of data (an,fc)type of level (pl,sfc,ml)
    gtco3210206GEMS Total column ozonevertically-integratedan +fcsfc
    tc_c2h6218045Total column ethanevertically-integratedan +fcsfc
    tc_c3h8218047Total column propanevertically-integratedan +fcsfc
    tc_c5h8218016Total column isoprenevertically-integratedan +fcsfc
    tc_ch4218004Total column methanevertically-integratedan +fcsfc
    tc_hno3218006Total column nitric acidvertically-integratedan +fcsfc
    tc_no218027Total column nitrogen monoxidevertically-integratedan +fcsfc
    tc_oh218030Total column hydroxyl radicalvertically-integratedan +fcsfc
    tc_pan218013Total column peroxyacetyl nitratevertically-integratedan +fcsfc
    tcco210127Total column Carbon monoxidevertically-integratedan +fcsfc
    tchcho210128Total column Formaldehydevertically-integratedan +fcsfc
    tcno2210125Total column Nitrogen dioxidevertically-integratedan +fcsfc
    tcso2210126Total column Sulphur dioxidevertically-integratedan +fcsfc
    tc_h2o2218003Total Column Hydrogen Peroxidevertically-integratedan + fc sfc
    c2h6217045Ethaneconcentration in airan +fcpl
    c3h8217047Propaneconcentration in airan +fcpl
    c5h8217016Isopreneconcentration in airan +fcpl
    ch4_c217004Methane (chemistry)concentration in airan +fcpl
    co210123Carbon monoxideconcentration in airan +fcpl
    go3210203GEMS Ozoneconcentration in airan +fcpl
    hcho210124Formaldehydeconcentration in airan +fcpl
    hno3217006Nitric acidconcentration in airan +fcpl
    no217027Nitrogen monoxideconcentration in airan +fcpl
    no2210121Nitrogen dioxideconcentration in airan +fcpl
    oh217030Hydroxyl radicalconcentration in airan +fcpl
    pan217013Peroxyacetyl nitrateconcentration in airan +fcpl
    so2210122Sulphur dioxideconcentration in airan + fcpl
    h2o2217003Hydrogen Peroxideconcentration in airan + fcpl 
    c2h6217045Ethaneconcentration in airan + fcml
    c3h8217047Propaneconcentration in airan + fcml
    c5h8217016Isopreneconcentration in airan + fcml
    ch4_c217004Methane (chemistry)concentration in airan + fcml
    co210123Carbon monoxideconcentration in airan + fcml
    go3210203GEMS Ozoneconcentration in airan + fcml
    hcho210124Formaldehydeconcentration in airan + fcml
    hno3217006Nitric acidconcentration in airan + fcml
    no217027Nitrogen monoxideconcentration in airan + fcml
    no2210121Nitrogen dioxideconcentration in airan + fcml
    oh217030Hydroxyl radicalconcentration in airan + fcml
    pan217013Peroxyacetyl nitrateconcentration in airan + fcml
    so2210122Sulphur dioxideconcentration in airan + fcml
    h2o2217003Hydrogen Peroxideconcentration in airan + fcml 
  •  Other (lsm, z, density, uvbed, uvbedcs)
    short nameparameter IDnametype of variabletype of data (an,fc)type of level (pl,sfc,ml)
    lsm172Land-sea mask2D parameteransfc
    z129Geopotential2D parameteransfc
    uvbed214002UV biologically effective dose2D parameterfcsfc
    uvbedcs214003UV biologically effective dose clear-sky2D parameterfcsfc
    den3089Density3D parameteran + fcpl
    den3089Density3D parameteran + fcml
    lnsp152Logarithm of surface pressure2D parameteran + fcml

Data volumes per model cycle

The data volumes are based on the current CAMS experiment (link).


 

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_sfc1.2 MB / 800 kB1151518 MB12 MB

an_pl

30 MB / 20 MB251624697 MB465 MB
an_ml70 MB / 47 MB6016251,7 GB1,1 GB
fc_sfc1.2 MB / 800 kB12633883,9 GB2,6 GB
fc_pl30 MB / 20 MB252498428 GB19 GB
fc_ml70 MB / 47 MB6025102568 GB45 GB
  Total 5461102 GB68 GB

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