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Acronyms

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Acronym	Description
ADS	Atmosphere Data Store
AOD	Aerosol optical depth
AM	Ammonium
APOLLO	AVHRR Processing scheme Over cLouds, Land and Ocean
APOLLO_NG	APOLLO Next Generation
ASCII	American Standard Code for Information Interchange
BC	Black carbon
BHI	Beam Horizontal Irradiation
BNI	Beam Normal Irradiation
BRDF	Bidirectional reflectance distribution function
CAMS	Copernicus Atmospheric Monitoring Service
CRS	CAMS Radiation Service
CSV	comma/semicolon separated data format
DHI	Diffuse Horizontal Irradiation
DU	Dust
GHI	Global Horizontal Irradiation
Heliosat-4	All-sky method
MACC	Monitoring Atmospheric Composition and Climate
McClear	Cloud-free method
MODIS	Moderate-resolution Imaging Spectroradiometer
MSG	Meteosat Second Generation
netCDF	Network common data format
NI	Nitrate
OR	Organic matter
ISO	International Organization for Standardization
SS	Sea salt
SU	Sulphate
TST	True Solar Time
UT	Universal Time

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All-sky direct (beam) All-sky direct (beam) normal IrradiationAll- diffuse All- global

Main Variable Names	NetCDF Units	Description
BHI	Wh m-2	Direct horizontal all sky irradiation, i.e., the direct part of the surface solar downward irradiation integrated over the whole spectrum available at ground level, on a horizontal surface
BNI	Wh m-2	Direct normal all sky irradiation. Part of the radiation that is received from the direction of the sun by a plane facing the sun.
DHI	Wh m-2	Diffuse horizontal all sky	irradiation, i.e., the diffuse part of the surface solar downward irradiation integrated over the whole spectrum available at ground level, on a horizontal surface.
GHI	Wh m-2	Global horizontal all sky	irradiation, i.e., the surface solar downward irradiation integrated over the whole spectrum available at ground level, on a horizontal surface.

Expert mode variables


BHIc	Wh m-2	Direct horizontal clear sky irradiation
BNIc	Wh m-2	Direct normal clear sky irradiation.
DHIc	Wh m-2	Diffuse horizontal clear sky irradiation
GHIc	Wh m-2	Global horizontal clear sky irradiation

Expert mode variables

For expert users, all input and output variables are provided in the ‘detailed info expert output For expert users, all input and output variables are provided in the ‘detailed info expert output mode’. It can only be retrieved when requesting 1 min resolved time series from the Atmosphere Data Store. Besides the standard outputs, it provides:

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Lefèvre, M., Oumbe, A., Blanc, P., Espinar, B., Gschwind, B., Qu, Z., Wald, L., Schroedter-Homscheidt, M., Hoyer-Klick, C., Arola, A., Benedetti, A., Kaiser, J., W., and Morcrette, J.-J.: McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions, Atmos. Meas. Tech., 6, 2403–2418, doi: 10.5194/amt-6-2403-2013, 2013. Available for download at http://www.atmos-meas-tech.net/6/2403/2013/amt-6-2403-2013.pdf

References

LefèvreGschwind, MB., Oumbe, AWald L., Blanc, P., EspinarLefèvre, BM., Gschwind, B., Qu, Z., Wald, L., Schroedter-Homscheidt, M., Hoyer-Klick, C., Arola, A., Benedetti, A., Kaiser, J., W., and Morcrette, J.-J.: McClear: a new model estimating 2019. Improving the McClear model estimating the downwelling solar radiation at ground level in clear-sky conditions, Atmos. Meas. Tech., 6, 2403–2418cloud free conditions – McClear-V3., Meteorol. Z./Contrib. Atm. Sci., 28, 2, 147-163, doi:10.5194/amt-6-2403-2013, 20131127/metz/2019/0946. Available for download at httphttps://www.atmos-meas-tech.net/6/2403/2013/amt-6-2403-2013.pdfGschwind, B., Wald Lschweizerbart.de/papers/metz/detail/28/90593/Improving_the_McClear_model_estimating_the_downwelling_solar_radiation_at_ground_level_in_cloud_free_conditions_McClear_v3

Lefèvre, M., Oumbe, A., Blanc, P., Lefèvre, MEspinar, B., Gschwind, B., Qu, Z., Wald, L., Schroedter-Homscheidt, M., Hoyer-Klick, C., Arola, A., Benedetti, 2019. Improving the McClear model estimating the A., Kaiser, J., W., and Morcrette, J.-J.: McClear: a new model estimating downwelling solar radiation at ground level in cloud free conditions – McClear-V3., Meteorol. Z./Contrib. Atm. Sci., 28, 2, 147-163clear-sky conditions, Atmos. Meas. Tech., 6, 2403–2418, doi: 10.1127/metz/2019/09465194/amt-6-2403-2013, 2013. Available for download at httpshttp://www.schweizerbart.de/papers/metz/detail/28/90593/Improving_the_McClear_model_estimating_the_downwelling_solar_radiation_at_ground_level_in_cloud_free_conditions_McClear_v3atmos-meas-tech.net/6/2403/2013/amt-6-2403-2013.pdf

Qu, Z., Oumbe, A., Blanc, P., Espinar, B., Gesell, G., Gschwind, B., Klüser, L., Lefèvre, M., Saboret, L., Schroedter-Homscheidt, M., and Wald L.: Fast radiative transfer parameterisation for assessing the surface solar irradiance: The Heliosat-4 method, Meteorol. Z., 26, 33-57, doi: 10.1127/metz/2016/0781,2017. Available for download at https://www.schweizerbart.de/papers/metz/detail/26/87036/Fast_radiative_transfer_parameterisation_for_asses?af=crossref.

Schroedter-Homscheidt, M., Azam, F., Betcke, J., Hanrieder, N., Lefèvre, M., Saboret, L., Saint-Drenan, Y.-M.: Surface solar irradiation retrieval from MSG/SEVIRI based on APOLLO Next Generation and HELIOSAT-4 methods, Contrib. Atm. Sci./Meteorol. Z.,2022, doi:10.1127/metz/2022/1132.

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_{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 user _{users thereof} uses _{use the information at} its _{their sole risk and liability. For the avoidance of all} doubts_{doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts} has _{have no liability in respect of this document, which is merely representing the} authors _{author's view.}

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