the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Calculating direct normal irradiance from sun photometer measurements
Juan Carlos Antuña-Marrero
Victoria Eugenia Cachorro
Frank García
René Estevan
Boris Barja
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.
This preprint has been withdrawn.
-
Withdrawal notice
This preprint has been withdrawn.
-
Preprint
(413 KB)
Juan Carlos Antuña-Marrero et al.
Interactive discussion


-
RC1: 'Manuscript review', Anonymous Referee #2, 10 May 2016
-
AC1: 'Withdrawing the paper for a major revision.', Juan Carlos Antuna, 02 Jun 2016
-
AC1: 'Withdrawing the paper for a major revision.', Juan Carlos Antuna, 02 Jun 2016
-
RC2: 'Review of "Calculating direct normal irradiance from sun photometer measurements"', Anonymous Referee #3, 13 Jun 2016
Interactive discussion


-
RC1: 'Manuscript review', Anonymous Referee #2, 10 May 2016
-
AC1: 'Withdrawing the paper for a major revision.', Juan Carlos Antuna, 02 Jun 2016
-
AC1: 'Withdrawing the paper for a major revision.', Juan Carlos Antuna, 02 Jun 2016
-
RC2: 'Review of "Calculating direct normal irradiance from sun photometer measurements"', Anonymous Referee #3, 13 Jun 2016
Juan Carlos Antuña-Marrero et al.
Juan Carlos Antuña-Marrero et al.
Viewed
HTML | XML | Total | BibTeX | EndNote | |
---|---|---|---|---|---|
733 | 570 | 59 | 1,362 | 60 | 66 |
- HTML: 733
- PDF: 570
- XML: 59
- Total: 1,362
- BibTeX: 60
- EndNote: 66