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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
20 Apr 2016
Review status
This discussion paper is a preprint. It has been under review for the journal Atmospheric Measurement Techniques (AMT). A final paper in AMT is not foreseen.
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 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.

Citation: Antuña-Marrero, J. C., Cachorro, V. E., García, F., Estevan, R., Barja, B., and de Frutos, Á. M.: Calculating direct normal irradiance from sun photometer measurements, Atmos. Meas. Tech. Discuss.,, 2016.
Juan Carlos Antuña-Marrero et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
RC1: 'Manuscript review', Anonymous Referee #2, 10 May 2016 Printer-friendly Version 
AC1: 'Withdrawing the paper for a major revision.', Juan Carlos Antuna, 02 Jun 2016 Printer-friendly Version 
RC2: 'Review of "Calculating direct normal irradiance from sun photometer measurements"', Anonymous Referee #3, 13 Jun 2016 Printer-friendly Version 
Juan Carlos Antuña-Marrero et al.
Juan Carlos Antuña-Marrero et al.


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