CAMS (global)

The Copernicus Atmosphere Monitoring Service (CAMS) uses a comprehensive global monitoring and forecasting system that estimates the state of the atmosphere on a daily basis, combining information from models and observations, and it provides a daily 5-day forecast.

Available species

The following species are available from CAMS regional data:

Species	Parameter value	Description
lnsp	AIR_PRESSURE	Logarithm of surface pressure
aermr01		Sea Salt Aerosol (0.03 - 0.5 um) Mixing Ratio
aermr02		Sea Salt Aerosol (0.5 - 5 um) Mixing Ratio
aermr03		Sea Salt Aerosol (5 - 20 um) Mixing Ratio
aermr04		Dust Aerosol (0.03 - 0.55 um) Mixing Ratio
aermr05		Dust Aerosol (0.55 - 0.9 um) Mixing Ratio
aermr06		Dust Aerosol (0.9 - 20 um) Mixing Ratio
aermr07		Hydrophobic Organic Matter Aerosol Mixing Ratio
aermr08		Hydrophilic Organic Matter Aerosol Mixing Ratio
aermr09		Hydrophobic Black Carbon Aerosol Mixing Ratio
aermr10		Hydrophilic Black Carbon Aerosol Mixing Ratio
aermr11		Sulphate Aerosol Mixing Ratio
no2	NO2	Nitrogen dioxide
so2	SO2	Sulphur dioxide
co	CO	Carbon monoxide
hcho	HCHO	Formaldehyde
go3	O3	GEMS Ozone
ch4	CH4	Methane
hno3	HNO3	Nitric acid
pan	PANS	Peroxyacetyl nitrate
c5h8		Isoprene
no	NO	Nitrogen monoxide
oh	OH	Hydroxyl radical
c2h6		Ethane
c3h8		Propane

Warning

Not all these species have been implemented for MSS-Chem yet. If you receive errors trying to download a species, please open a Github issue and I will promptly add it to the code base.

In order to include a species in the download, add the species’ Parameter value to the species list in the configuration.

Configuration

In order to download CAMS global data, MSS-Chem must be configured as follows:

import os.path

from msschem.models import CAMSRegDriver
from msschem.download import CAMSRegDownload

register_datasources = {
    'CAMSGlob': CAMSGlobDriver(
        dict(
            dldriver=CAMSGlobDownload(
                username="MYUSERNAME",
                password="MYPASSWORD",
                host="dissemination.ecmwf.int",
                n_tries=1),
            force=False,
            basepath=os.path.expanduser('~/tmp/mss/data/'),
            name='CAMSGlob',
            temppath=None,
            species=['CO', 'O3', 'HCHO', 'HNO3', 'NO', 'NO2', 'OH', 'PANS',
                     'SO2'],
        )
    ),
}

Data access

CAMS global forecast data can be accessed via an FTP service. Access is free of charge, but requires accepting a data license. ECMWF will then e-mail you a username and a password, both to be used in the MSS-Chem configuratiion (see above).