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New parameters in FTP dissemination

Mass density of air

At the moment almost all of the chemical and aerosol species we disseminate and archive are expressed as mass mixing ratios (kg kg-1). While this might be enough for most of the users, some would prefer to convert the data to mass concentration values (kg m-3).

The conversion formula is simple. We are now providing density of dry air ("den") as a new parameter in the CAMS main global dissemination stream (CAMS_NREALTIME/ CAMS_GLOBAL). The parameter is available on pressure and model levels in both GRIB and NetCDF format from the FTP server (ftp://dissemination.ecmwf.int).

The air density fields are not archived in the MARS data archive and are not available through Web API service.

The new files are named as follows:

Code Block
z_cams_c_ecmf_20180425000000_prod_an_ml_000_den.grib
z_cams_c_ecmf_20180425000000_prod_an_ml_000_den.nc
z_cams_c_ecmf_20180425000000_prod_an_pl_000_den.grib
z_cams_c_ecmf_20180425000000_prod_an_pl_000_den.nc
...
z_cams_c_ecmf_20180425000000_prod_fc_ml_012_den.grib
z_cams_c_ecmf_20180425000000_prod_fc_ml_012_den.nc
z_cams_c_ecmf_20180425000000_prod_fc_pl_012_den.grib
z_cams_c_ecmf_20180425000000_prod_fc_pl_012_den.nc
...

Computation scripts

To compute mass concentration you can use the scripts below.

Compute mass concentration of a chemical species on pressure level from NetCDF output

Code Block
languagebash
titlecompute_nc_concentration.sh
linenumberstrue
collapsetrue
#!/bin/sh
module load cdo

DATADIR=/path-to-datadir
LEVEL=1000  # select pressure level
PARAM=co    # select parameter

# extract single level field
cdo -sellevel,${LEVEL} ${DATADIR}/z_cams_c_ecmf_20180425000000_prod_fc_pl_012_${PARAM}.nc ${PARAM}_mmr_${LEVEL}.nc
cdo -sellevel,${LEVEL} ${DATADIR}/z_cams_c_ecmf_20180425000000_prod_fc_pl_012_den.nc den_${LEVEL}.nc

# unpack NetCDF data
cdo -b f32 copy ${PARAM}_mmr_${LEVEL}.nc ${PARAM}_mmr_${LEVEL}_32.nc
cdo -b f32 copy den_${LEVEL}.nc den_${LEVEL}_32.nc

# compute concentration = mmr * air_density
cdo mul ${PARAM}_mmr_${LEVEL}_32.nc den_${LEVEL}_32.nc ${PARAM}_conc_${LEVEL}.nc

Compute mass concentration of a chemical species on model level from GRIB file

Code Block
languagebash
titlecompute_grib_concentration.sh
linenumberstrue
collapsetrue
#!/bin/sh
module load eccodes
module load cdo

DATADIR=/path-to-datadir
LEVEL=60       # select model level
PARAM=no2      # select parameter

# extract single level field
grib_copy -w level=${LEVEL} ${DATADIR}/z_cams_c_ecmf_20180425000000_prod_fc_pl_012_${PARAM}.grib ${PARAM}_mmr_${LEVEL}.grib
grib_copy -w level=${LEVEL} ${DATADIR}/z_cams_c_ecmf_20180425000000_prod_fc_pl_012_den.grib den_${LEVEL}.grib

# compute concentration = mmr * air_density
cdo mul ${PARAM}_mmr_${LEVEL}.grib den_${LEVEL}.grib ${PARAM}_conc_${LEVEL}.grib

New aerosol parameters in data archive

Several new aerosol diagnostic parameters are available from our MARS data archive using the Web API service. Please read the service description if you haven't used it before.

To access test data please use dataset=cams_esuite keyword. After the upgrade data will be available using keyword dataset=cams_nrealtime.

They are not distributed via the FTP server.

parameter grouplist of parameters

Aerosol optical depth at additional wavelengths


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
210217, aod340, Total aerosol optical depth at 340 nm
210218, aod355, Total aerosol optical depth at 355 nm
210219, aod380, Total aerosol optical depth at 380 nm
210220, aod400, Total aerosol optical depth at 400 nm
210221, aod440, Total aerosol optical depth at 440 nm
210222, aod500, Total aerosol optical depth at 500 nm
210223, aod532, Total aerosol optical depth at 532 nm
210224, aod645, Total aerosol optical depth at 645 nm
210225, aod800, Total aerosol optical depth at 800 nm
210226, aod858, Total aerosol optical depth at 858 nm
210227, aod1020, Total aerosol optical depth at 1020 nm
210228, aod1064, Total aerosol optical depth at 1064 nm
210229, aod1640, Total aerosol optical depth at 1640 nm
210230, aod2130, Total aerosol optical depth at 2130 nm


Absorption optical depth


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
215096, aodabs340, Total absorption aerosol optical depth at 340 nm
215097, aodabs355, Total absorption aerosol optical depth at 355 nm
215098, aodabs380, Total absorption aerosol optical depth at 380 nm
215099, aodabs400, Total absorption aerosol optical depth at 400 nm
215100, aodabs440, Total absorption aerosol optical depth at 440 nm
215101, aodabs469, Total absorption aerosol optical depth at 469 nm
215102, aodabs500, Total absorption aerosol optical depth at 500 nm
215103, aodabs532, Total absorption aerosol optical depth at 532 nm
215104, aodabs550, Total absorption aerosol optical depth at 550 nm
215105, aodabs645, Total absorption aerosol optical depth at 645 nm
215106, aodabs670, Total absorption aerosol optical depth at 670 nm
215107, aodabs800, Total absorption aerosol optical depth at 800 nm
215108, aodabs858, Total absorption aerosol optical depth at 858 nm
215109, aodabs865, Total absorption aerosol optical depth at 865 nm
215110, aodabs1020, Total absorption aerosol optical depth at 1020 nm
215111, aodabs1064, Total absorption aerosol optical depth at 1064 nm
215112, aodabs1240, Total absorption aerosol optical depth at 1240 nm
215113, aodabs1640, Total absorption aerosol optical depth at 1640 nm
215176, aodabs2130, Total absorption aerosol optical depth at 2130 nm


Fine-mode optical depth


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
215114, aodfm340, Total fine mode (r < 0.5 um) aerosol optical depth at 340 nm
215115, aodfm355, Total fine mode (r < 0.5 um) aerosol optical depth at 355 nm
215116, aodfm380, Total fine mode (r < 0.5 um) aerosol optical depth at 380 nm
215117, aodfm400, Total fine mode (r < 0.5 um) aerosol optical depth at 400 nm
215118, aodfm440, Total fine mode (r < 0.5 um) aerosol optical depth at 440 nm
215119, aodfm469, Total fine mode (r < 0.5 um) aerosol optical depth at 469 nm
215120, aodfm500, Total fine mode (r < 0.5 um) aerosol optical depth at 500 nm
215121, aodfm532, Total fine mode (r < 0.5 um) aerosol optical depth at 532 nm
215122, aodfm550, Total fine mode (r < 0.5 um) aerosol optical depth at 550 nm
215123, aodfm645, Total fine mode (r < 0.5 um) aerosol optical depth at 645 nm
215124, aodfm670, Total fine mode (r < 0.5 um) aerosol optical depth at 670 nm
215125, aodfm800, Total fine mode (r < 0.5 um) aerosol optical depth at 800 nm
215126, aodfm858, Total fine mode (r < 0.5 um) aerosol optical depth at 858 nm
215127, aodfm865, Total fine mode (r < 0.5 um) aerosol optical depth at 865 nm
215128, aodfm1020, Total fine mode (r < 0.5 um) aerosol optical depth at 1020 nm
215129, aodfm1064, Total fine mode (r < 0.5 um) aerosol optical depth at 1064 nm
215130, aodfm1240, Total fine mode (r < 0.5 um) aerosol optical depth at 1240 nm
215131, aodfm1640, Total fine mode (r < 0.5 um) aerosol optical depth at 1640 nm
215177, aodfm2130, Total fine mode (r < 0.5 um) aerosol optical depth at 2130 nm


Column-mean single scattering albedo


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
215132, ssa340, Single scattering albedo at 340 nm
215133, ssa355, Single scattering albedo at 355 nm
215134, ssa380, Single scattering albedo at 380 nm
215135, ssa400, Single scattering albedo at 400 nm
215136, ssa440, Single scattering albedo at 440 nm
215137, ssa469, Single scattering albedo at 469 nm
215138, ssa500, Single scattering albedo at 500 nm
215139, ssa532, Single scattering albedo at 532 nm
215140, ssa550, Single scattering albedo at 550 nm
215141, ssa645, Single scattering albedo at 645 nm
215142, ssa670, Single scattering albedo at 670 nm
215143, ssa800, Single scattering albedo at 800 nm
215144, ssa858, Single scattering albedo at 858 nm
215145, ssa865, Single scattering albedo at 865 nm
215146, ssa1020, Single scattering albedo at 1020 nm
215147, ssa1064, Single scattering albedo at 1064 nm
215148, ssa1240, Single scattering albedo at 1240 nm
215149, ssa1640, Single scattering albedo at 1640 nm
215178, ssa2130, Single scattering albedo at 2130 nm


Column-mean asymmetry parameter


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
215150, asymmetry340, asymmetry factor at 340 nm
215151, asymmetry355, asymmetry factor at 355 nm
215152, asymmetry380, asymmetry factor at 380 nm
215153, asymmetry400, asymmetry factor at 400 nm
215154, asymmetry440, asymmetry factor at 440 nm
215155, asymmetry469, asymmetry factor at 469 nm
215156, asymmetry500, asymmetry factor at 500 nm
215157, asymmetry532, asymmetry factor at 532 nm
215158, asymmetry550, asymmetry factor at 550 nm
215159, asymmetry645, asymmetry factor at 645 nm
215160, asymmetry670, asymmetry factor at 670 nm
215161, asymmetry800, asymmetry factor at 800 nm
215162, asymmetry858, asymmetry factor at 858 nm
215163, asymmetry865, asymmetry factor at 865 nm
215164, asymmetry1020, asymmetry factor at 1020 nm
215165, asymmetry1064, asymmetry factor at 1064 nm
215166, asymmetry1240, asymmetry factor at 1240 nm
215167, asymmetry1640, asymmetry factor at 1640 nm
215179, asymmetry2130, asymmetry factor at 2130 nm


Per-bin aerosol optical depth at 550 nm


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
215022, aerodsss,  Sea salt aerosol (0.03 - 0.5 um) optical depth
215023, aerodssm,  Sea salt aerosol (0.5 - 5 um) optical depth
215024, aerodssl,  Sea salt aerosol (5 - 20 um) optical depth
215046, aeroddus,  Dust aerosol (0.03 - 0.55 um) optical depth
215047, aeroddum,  Dust aerosol (0.55 - 9 um) optical depth
215048, aeroddul,  Dust aerosol (9 - 20 um) optical depth
215063, aerodomhphob,  Hydrophobic organic matter aerosol optical depth
215064, aerodomhphil,  Hydrophilic organic matter aerosol optical depth
215079, aerodbchphob,  Hydrophobic black carbon aerosol optical depth
215080, aerodbchphil,  Hydrophilic black carbon aerosol optical depth
215088, aerodsu,  Sulphate aerosol optical depth


Aerosol mass budget terms


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
215001, aersrcsss,  Source/gain of sea salt aerosol (0.03 - 0.5 um)
215002, aersrcssm,  Source/gain of sea salt aerosol (0.5 - 5 um)
215003, aersrcssl,  Source/gain of sea salt aerosol (5 - 20 um)
215004, aerddpsss,  Dry deposition of sea salt aerosol (0.03 - 0.5 um)
215005, aerddpssm,  Dry deposition of sea salt aerosol (0.5 - 5 um)
215006, aerddpssl,  Dry deposition of sea salt aerosol (5 - 20 um)
215007, aersdmsss,  Sedimentation of sea salt aerosol (0.03 - 0.5 um)
215008, aersdmssm,  Sedimentation of sea salt aerosol (0.5 - 5 um)
215009, aersdmssl,  Sedimentation of sea salt aerosol (5 - 20 um)
215010, aerwdlssss,  Wet deposition of sea salt aerosol (0.03 - 0.5 um) by large-scale precipitation
215011, aerwdlsssm,  Wet deposition of sea salt aerosol (0.5 - 5 um) by large-scale precipitation
215012, aerwdlsssl,  Wet deposition of sea salt aerosol (5 - 20 um) by large-scale precipitation
215013, aerwdccsss,  Wet deposition of sea salt aerosol (0.03 - 0.5 um) by convective precipitation
215014, aerwdccssm,  Wet deposition of sea salt aerosol (0.5 - 5 um) by convective precipitation
215015, aerwdccssl,  Wet deposition of sea salt aerosol (5 - 20 um) by convective precipitation
215016, aerngtsss,  Negative fixer of sea salt aerosol (0.03 - 0.5 um)
215017, aerngtssm,  Negative fixer of sea salt aerosol (0.5 - 5 um)
215018, aerngtssl,  Negative fixer of sea salt aerosol (5 - 20 um)
215025, aersrcdus,  Source/gain of dust aerosol (0.03 - 0.55 um)
215026, aersrcdum,  Source/gain of dust aerosol (0.55 - 9 um)
215027, aersrcdul,  Source/gain of dust aerosol (9 - 20 um)
215028, aerddpdus,  Dry deposition of dust aerosol (0.03 - 0.55 um)
215029, aerddpdum,  Dry deposition of dust aerosol (0.55 - 9 um)
215030, aerddpdul,  Dry deposition of dust aerosol (9 - 20 um)
215031, aersdmdus,  Sedimentation of dust aerosol (0.03 - 0.55 um)
215032, aersdmdum,  Sedimentation of dust aerosol (0.55 - 9 um)
215033, aersdmdul,  Sedimentation of dust aerosol (9 - 20 um)
215034, aerwdlsdus,  Wet deposition of dust aerosol (0.03 - 0.55 um) by large-scale precipitation
215035, aerwdlsdum,  Wet deposition of dust aerosol (0.55 - 9 um) by large-scale precipitation
215036, aerwdlsdul,  Wet deposition of dust aerosol (9 - 20 um) by large-scale precipitation
215037, aerwdccdus,  Wet deposition of dust aerosol (0.03 - 0.55 um) by convective precipitation
215038, aerwdccdum,  Wet deposition of dust aerosol (0.55 - 9 um) by convective precipitation
215039, aerwdccdul,  Wet deposition of dust aerosol (9 - 20 um) by convective precipitation
215040, aerngtdus,  Negative fixer of dust aerosol (0.03 - 0.55 um)
215041, aerngtdum,  Negative fixer of dust aerosol (0.55 - 9 um)
215042, aerngtdul,  Negative fixer of dust aerosol (9 - 20 um)
215049, aersrcomhphob,  Source/gain of hydrophobic organic matter aerosol
215050, aersrcomhphil,  Source/gain of hydrophilic organic matter aerosol
215051, aerddpomhphob,  Dry deposition of hydrophobic organic matter aerosol
215052, aerddpomhphil,  Dry deposition of hydrophilic organic matter aerosol
215053, aersdmomhphob,  Sedimentation of hydrophobic organic matter aerosol
215054, aersdmomhphil,  Sedimentation of hydrophilic organic matter aerosol
215055, aerwdlsomhphob,  Wet deposition of hydrophobic organic matter aerosol by large-scale precipitation
215056, aerwdlsomhphil,  Wet deposition of hydrophilic organic matter aerosol by large-scale precipitation
215057, aerwdccomhphob,  Wet deposition of hydrophobic organic matter aerosol by convective precipitation
215058, aerwdccomhphil,  Wet deposition of hydrophilic organic matter aerosol by convective precipitation
215059, aerngtomhphob,  Negative fixer of hydrophobic organic matter aerosol
215060, aerngtomhphil,  Negative fixer of hydrophilic organic matter aerosol
215065, aersrcbchphob,  Source/gain of hydrophobic black carbon aerosol
215066, aersrcbchphil,  Source/gain of hydrophilic black carbon aerosol
215067, aerddpbchphob,  Dry deposition of hydrophobic black carbon aerosol
215068, aerddpbchphil,  Dry deposition of hydrophilic black carbon aerosol
215069, aersdmbchphob,  Sedimentation of hydrophobic black carbon aerosol
215070, aersdmbchphil,  Sedimentation of hydrophilic black carbon aerosol
215071, aerwdlsbchphob,  Wet deposition of hydrophobic black carbon aerosol by large-scale precipitation
215072, aerwdlsbchphil,  Wet deposition of hydrophilic black carbon aerosol by large-scale precipitation
215073, aerwdccbchphob,  Wet deposition of hydrophobic black carbon aerosol by convective precipitation
215074, aerwdccbchphil,  Wet deposition of hydrophilic black carbon aerosol by convective precipitation
215075, aerngtbchphob,  Negative fixer of hydrophobic black carbon aerosol
215076, aerngtbchphil,  Negative fixer of hydrophilic black carbon aerosol
215081, aersrcsu,  Source/gain of sulphate aerosol
215082, aerddpsu,  Dry deposition of sulphate aerosol
215083, aersdmsu,  Sedimentation of sulphate aerosol
215084, aerwdlssu,  Wet deposition of sulphate aerosol by large-scale precipitation
215085, aerwdccsu,  Wet deposition of sulphate aerosol by convective precipitation
215086, aerngtsu,  Negative fixer of sulphate aerosol
215168, aersrcso2, Source/gain of sulphur dioxide
215169, aerddpso2, Dry deposition of sulphur dioxide
215170, aersdmso2, Sedimentation of sulphur dioxide
215171, aerwdlsso2, Wet deposition of sulphur dioxide by large-scale precipitation
215172, aerwdccso2, Wet deposition of sulphur dioxide by convective precipitation
215173, aerngtso2, Negative fixer of sulphur dioxide


Model-level fields

(aerext* and aerbackscat* are also available on pressure levels; aot* are not)


Code Block
titlesee all
collapsetrue
paramId, shortName, full name
215093, aot532, Total aerosol optical thickness at 532 nm
215094, naot532, Natural (sea-salt and dust) aerosol optical thickness at 532 nm
215095, aaot532, Antropogenic (black carbon, organic matter, sulphate) aerosol optical thickness at 532 nm
215180, aerext355, Aerosol extinction coefficient at 355 nm
215181, aerext532, Aerosol extinction coefficient at 532 nm
215182, aerext1064, Aerosol extinction coefficient at 1064 nm
215183, aerbackscattoa355, Aerosol backscatter coefficient at 355 nm (from top of atmosphere)
215184, aerbackscattoa532, Aerosol backscatter coefficient at 532 nm (from top of atmosphere)
215185, aerbackscattoa1064, Aerosol backscatter coefficient at 1064 nm (from top of atmosphere)
215186, aerbackscatgnd355, Aerosol backscatter coefficient at 355 nm (from ground)
215187, aerbackscatgnd532, Aerosol backscatter coefficient at 532 nm (from ground)
215188, aerbackscatgnd1064, Aerosol backscatter coefficient at 1064 nm (from ground)


A new near-surface service

To reduce the volume of data one would have to download to access near-surface values we are introducing a new data service. We are making the lowest model level analyses and forecasts of atmospheric composition parameters available as separate files. The fields are based on same CAMS global modelling system.

In the new file names level type information is encoded as ml60, the files can be found in the directory called CAMS_GLOBAL_ADDITIONAL:

Code Block
/DATA/CAMS_GLOBAL_ADDITIONAL/2018042500/z_cams_c_ecmf_20180425000000_prod_an_ml60_000_aermr01.grib
/DATA/CAMS_GLOBAL_ADDITIONAL/2018042500/z_cams_c_ecmf_20180425000000_prod_an_ml60_000_aermr01.nc
...