Quality assessment of HelioClim-3 version 4 and 5 versus ground stations

Last update: Dec. 2017

 

Validation performed by SoDa

This section follows the protocol of validation described here on SoDa. The 1 min BSRN station measurements have been priorly qualified using the quality check procedure available here.

14 BSRN stations

14 Baseline Surface Radiation Network (BSRN) stations spread in the Meteosat 2nd generation coverage, 1 min values.

More info on the BSRN stations =>

See obsolete prior validation results (McClear v2)

Validation results

 

Obsolete
validation results

8 RMI stations

8 stations from the Belgian Royal Meteorological Institute (RMI), hourly values

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

- Validation results
31 INMET stations

31 stations from the Instituto Nacional de Meteorologia (INMET), hourly values

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

- Validation results
11 INPE stations

11 stations from the Instituto Nacional de Pesquisas Espaciais (INPE), 1 min values

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

- Validation results
5 Oman and UAE stations

5 stations - poster , (Sites Oman: Sunainah, Adam Airport, Sur, Muscat Airport. Site UAE: Shams). Validation HC3v4, V5 and CAMS radiation. (email d'EW 26/08/2016 EMS2016/OmanMathilde)

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

- Marchand et al. 2017
Irradiation validation report

This online service enables you to carry out the quality assessment of the daily Global Horizontal Irradiation data of three satellite-based resources versus the measurements of 31 stations of the WRDC network. The satellite-based resources are HelioClim-3 version 4, HelioClim-3 version 5 and MACC-RAD. Select the temporal of you choice in the temporal coverage available for each station, and then retrieve a full report in html format of quality assessment.

The Irradiation Validation Report service has been upgraded during the release of Oct. 2017; it allows you to compare HelioClim-3 and CAMS Radiation data with ground measurements at 31 locations for hourly and daily time steps.

 

 

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Validation performed outside SoDa

Ineichen 2016

Independant validation performed by P. Ineichen, University of Geneva - February 2016 - Long term HelioClim-3 global, beam and diffuse irradiance validation

(NB: obsolete since these statistics doesn't take into account the bias correction and McClear v3 available since Oct. 2017)

- Ineichen 2016

 

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Additional notes:

  • Diffused component measured with a pyranometer and a shadow band: If you need to handle the measurements of the Diffuse Horizontal component acquired by a pyranometer and a shadow-band, the values will likely be underestimated. This is due to the fact that the band is occulting a part of the sky and thus a part of diffuse that should be collected by the sensor.
    Here at MINES ParisTech/Transvalor, we decided to apply the correction of Muneer-Zhang (Muneer T, Zhang X. A new method for correcting shadow band diffuse irradiance data. J Sol Energy Eng 2002;124:34e43) which sligthly increase the values for the diffuse component.
  • Measurements with a pyrheliometer: the pyheliometers have a larger half opening angle than the satellite-based estimations (HelioClim-3, MACC-RAD...) which obeys by construction to the definition given by the community of the radiative transfer models where the sun is more punctual. This has a very limited influence in clear sky conditions, but in overcast conditions, the contribution of the circumsolar  irradiance to the pyrheliometer measurements may exceed 50% due to specific effects of clouds, especially that of cirrus clouds. No correction is presently brought to the HelioClim-3 or MACC-RAD outputs.