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Table 1: Overview of key characteristics
| Clear-Sky (McClear) | All-Sky (Heliosat-4) |
| ADS name | Cloud-free conditions only | Both cloud-free and actual weather conditions |
Type of product | Point data, time-series | |
Parameters | GHI, DHI, BHI, BNI | |
Geographical area | global | Europe / Africa / Middle East / Atlantic Ocean |
Horizontal resolution | Interpolated to point of interest from various spatial input data resolutions | |
Time coverage | from 2004-01-01 to | from 2004-02-01 to |
Temporal resolution | 1 min, 15 min, 1 h, 1 day, 1 month | |
Data format | ASCII (CSV), NetCDF | |
Data file size | File size depends on the temporal resolution. Largest files are in 1 min temporal resolution and the CSV data format | |
Data access | ||
Processing | on request; data normally available within a few minutes | |
Update of the databases | 2 days delayed mode | |
The CAMS Radiation Service CSV formatted products are presented as a metadata header section, followed by lines of values (columns). The metadata header section helps the user to understand the data, and describing the various features of the products. These metadata are written as text in the delivered file, and conform to the ISO standard where available. Currently these metadata are:
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Standard output variables
| Main Variable Names | NetCDF Units | Description |
|---|---|---|
| BHI | Wh m-2 | All-sky direct (beam) 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 | All-sky direct (beam) normal Irradiation. Part of the radiation that is received from the direction of the sun by a plane facing the sun. |
| DHI | Wh m-2 | All-sky diffuse 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 | All-sky global irradiation, i.e., the surface solar downward irradiation integrated over the whole spectrum available at ground level, on a horizontal surface. |
Expert mode variables
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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Known issues and version updates
| Date | Version | Description |
2021-06 | v4.0 (current) | Since 2013, CAMS Radiation service used the cloud retrieval scheme APOLLO. The version 4.0 of CAMS Radiation Service includes a new version APOLLO Next Generation (APOLLO_NG) that improves cloud detection using fuzzy logic. |
2018-06 | v3.2 | Fix of a mathematical bug in the (latitude, longitude) position of the pixels of the Meteosat satellite images. |
2018-03 | v3.1 | CAMS McClear benefits from the successive enhancements of the Aerosol Optical Depth versions. McClear version, and consequently CAMS radiation service version as well, have been incremented from 3.0 to 3.1. Results are slightly modified in October 2012 and September-November 2015. |
2017-10 | v3 | McClear clear sky model v3 |
2015-10 | v2.7 | McClear v2.7 |
2015-07 | v2.6 | Bug fixed in verbose expert mode |
2015-02 | v2.6 | Bug fixed in the filling of MACC AOD databases |
2015-01 | v2.6 | Bug fixed bug for cloud coverage > 100% |
2014-11 | v2.5 | APOLLO data coverage extension: 2004-02-01 to D-2 |
2014-11 | v2.4 | Call to McClear v2.4 |
2014-08 | v2.3 | Call to McClear v2.3 Bug fixed in APOLLO data interpolation |
v2.2 | does not exist (synchronization with McClear versions) | |
2014-07 | v2.1 | Bug fixed for the shift of one pixel in APOLLO files import |
2013-07 | v2.0 | Edition format file version 1 |
How to acknowledge and cite the data
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Gschwind, B., Wald L., Blanc, P., Lefèvre, M., Schroedter-Homscheidt, M., Arola, A., 2019. Improving the McClear model estimating the downwelling solar radiation at ground level in cloud free conditions – McClear-V3., Meteorol. Z./Contrib. Atm. Sci., 28, 2, 147-163, doi:10.1127/metz/2019/0946. Available for download at https://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_v3
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| false | This document has been produced in the context of the Copernicus AtmosphereAtmosphere 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). 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 thereof uses the information at its sole risk and liability. For the avoidance of all doubts, the European Commission and the European Centre for Medium-Range Weather Forecasts has no liability in respect of this document, which is merely representing the authors view. |
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