Preprints
https://doi.org/10.5194/amt-2016-74
https://doi.org/10.5194/amt-2016-74
20 Apr 2016
 | 20 Apr 2016
Status: this preprint has been withdrawn by the authors.

Calculating direct normal irradiance from sun photometer measurements

Juan Carlos Antuña-Marrero, Victoria Eugenia Cachorro, Frank García, René Estevan, Boris Barja, and Ángel M. de Frutos

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.

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Juan Carlos Antuña-Marrero, Victoria Eugenia Cachorro, Frank García, René Estevan, Boris Barja, and Ángel M. de Frutos

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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, Victoria Eugenia Cachorro, Frank García, René Estevan, Boris Barja, and Ángel M. de Frutos
Juan Carlos Antuña-Marrero, Victoria Eugenia Cachorro, Frank García, René Estevan, Boris Barja, and Ángel M. de Frutos

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This preprint has been withdrawn.