CAMS McClear service

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PRESENTATION

This service provides time series of Global, Direct, and Diffuse Irradiations on horizontal surface, and Direct Irradiation on normal plane (DNI) in clear-sky conditions. The model has been upgraded to CAMS McClear version 3 during Oct. 2017 release.

The research leading to these results has received funding from the European Union's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 218793 (MACC project, 2009-2011), no. 283576 (MACC-II project, 2011-2014) and from no. 633080 (MACC-III project, 2014-2015).

  • Geographical coverage : Worlwide
  • Temporal coverage of data is from 2004-01-01 up to 2 days ago (NEW)
  • Time step: from 1 min to 1 month.
  • Maximum number of requests per day and per registered user: 25. This limit may evolve.

Main publication

Lefèvre M., A. Oumbe, P. Blanc, B. Espinar, B. Gschwind, Z. Qu, L. Wald, M. Schroedter-Homscheidt, C. Hoyer-Klick, A. Arola, A. Benedetti, J. W. Kaiser, and J.-J.  Morcrette, "McClear: a new model estimating downwelling solar radiation at ground level in clear-sky conditions", Atmos. Meas. Tech., 6, 2403-2418, 2013, doi:10.5194/amt-6-2403-2013.
More publications on CAMS McClear service (keyword: "McClear").

 
The CAMS Radiation Service in a nutshell - Version 6 (December 2016)
 
User's Guide to the CAMS Radiation Service - December 2016

  Free volumes of data

  => Contact us to download a volume 15 minute CAMS data over Europe or Africa

  Outputs

Facing issues with decimal separator in Excel? Please read this FAQ

  1. Observation period: beginning/end of the time period with the format "yyyy-mm-ddTHH:MM:SS.S/yyyy-mm-ddTHH:MM:SS.S" (ISO 8601)
  2. TOA: Irradiation on horizontal plane at the top of atmosphere (Wh/m2) computed from Solar Geometry 2
  3. Clear sky GHI: Clear sky global irradiation on horizontal plane at ground level (Wh/m2)
  4. Clear sky BHI: Clear sky beam irradiation on horizontal plane at ground level (Wh/m2)
  5. Clear sky DHI: Clear sky diffuse irradiation on horizontal plane at ground level (Wh/m2)
  6. Clear sky BNI: Clear sky beam irradiation on mobile plane following the sun at normal incidence (Wh/m2)

In verbose mode (1 minute summarization only), additional columns are:

  1. sza. Solar zenith angle for the middle of the summarization (deg)
  2. summer/winter split. 1.0 means summer, 0.0 means winter
  3. tco3. Total column content of ozone (Dobson unit)
  4. tcwv. Total column content of water vapour (kg/m2)
  5. AOD BC. Partial aerosol optical depth at 550 nm for black carbon
  6. AOD DU. Partial aerosol optical depth at 550 nm for dust
  7. AOD SS. Partial aerosol optical depth at 550 nm for sea salt
  8. AOD OR. Partial aerosol optical depth at 550 nm for organic matter
  9. AOD SU. Partial aerosol optical depth at 550 nm for sulphate
  10. AOD 550. Aerosol optical depth at 550 nm
  11. AOD 1240. Aerosol optical depth at 1240 nm
  12. alpha. Angstroem coefficient for aerosol
  13. Aerosol type. Type of aerosol: -1=no value 5=urban 7=continental clean 8=continental polluted 9=continental average 10=maritime clean 11= maritime polluted 12=maritime tropical 13=antarctic 14=desert
  14. fiso. MODIS-like BRDF parameter fiso
  15. fvol. MODIS-like BRDF parameter fvol
  16. fgeo. MODIS-like BRDF parameter
  17. albedo. Ground albedo

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AUTOMATIC ACCESS

   FOR FREE - restricted to registered users

The email address you used for your registration is needed to be able to launch the command line.

More information concerning the automatic access using the WGET command - Automatic access with WPS - (CURL command not available)

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VERSIONS

   Date     Version  Details
2012 v1 Prototype
2013 v2.0 Final version for the SoDa service
2013-09 v2.0 Bug fixed in Solar Geometry 2 library
Edition format file version 1
2014-03 v2.1 Earlier Solar Geometry 1 library not sustained further, replaced with Solar Geometry 2
2014-07 v2.2 Climatic zones (AFGL) maps modification in equatorial zone (Mozambique): dithering the edge between 2 zones
2014-08 v2.3 Climatic zones (AFGL) modification in equatorial zone (Mozambique): gradation of value between 2 zones
2014-08 v2.3 Bug fixed in the calculation of MODIS albedo
2014-10 v2.4 Bug fixed in the conversion of UT into TST
2015-01 v2.6 Edition format file version 2
2015-10 v2.7 Bug fixed for Short term vs long term mismatch. A difference has been noticed between the long term values (2004 Feb to 2015 June)  and the short term values  (2015 May to 2015 August) for the global irradiation received by an inclined surface estimated by HC3v5. For the two months overlapping: May and June 2015, these values differ from one request to August) for the global irradiation received by an inclined surface estimated by HC3v5. For the two months overlapping: May and June 2015, these values differ from one request to the other by a very small amount while they should not. Causes are in the procedure for optimization processing speed.
2017-10 v3 Calls new McClear version 3 that fixes discontinuities in space and time (during day as well as seasons), uses less memory and reduces (a little) the error when compared to ground measurements.

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