Preprints
https://doi.org/10.5194/amt-2016-74
https://doi.org/10.5194/amt-2016-74

  20 Apr 2016

20 Apr 2016

Review status: this preprint has been withdrawn by the authors.

Calculating direct normal irradiance from sun photometer measurements

Juan Carlos Antuña-Marrero1, Victoria Eugenia Cachorro2, Frank García1, René Estevan1, Boris Barja1, and Ángel M. de Frutos2 Juan Carlos Antuña-Marrero et al.
  • 1Grupo de Óptica Atmosférica de Camagüey, Centro Meteorológico Provincial de Camagüey, INSMET, Cuba
  • 2Grupo de Óptica Atmosférica, Universidad de Valladolid, Spain

Abstract. An alternative method to modeling is proposed for determining direct normal irradiance from sun photometer measurements. Direct normal irradiance is calculated by integration of the sun photometer spectral irradiance measurements. Using pre and post calibration spectral coefficients and the extraterrestrial spectral irradiances at each filter effective wavelength, digital counts are converted into direct spectral irradiances data. Then the trapezoidal integration procedure is applied to calculate the direct normal beam. The error associated to the integration method is estimated between 6 and 2 % depending if the infrared filter is for the 1240 or 1640 nm respectively. Validation with collocated quasi-simultaneous manually measured and with modeled direct normal irradiance shows encouraging results. Although the results are not categorically conclusive, they evidence the capabilities of the proposed method for deriving direct normal irradiance under clear sky and also for cloudy conditions. Better results are expected for validations with simultaneous automatic direct normal irradiance measurements.

This preprint has been withdrawn.

Juan Carlos Antuña-Marrero et al.

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Juan Carlos Antuña-Marrero et al.

Juan Carlos Antuña-Marrero et al.

Viewed

Total article views: 989 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
530 422 37 989 39 43
  • HTML: 530
  • PDF: 422
  • XML: 37
  • Total: 989
  • BibTeX: 39
  • EndNote: 43
Views and downloads (calculated since 20 Apr 2016)
Cumulative views and downloads (calculated since 20 Apr 2016)
Latest update: 26 Oct 2021
Download

This preprint has been withdrawn.