Bibcode
García, R. D.; Cuevas, E.; García, O. E.; Cachorro, V. E.; Pallé, P. L.; Bustos, J. J.; Romero-Campos, P. M.; de Frutos, A. M.
Referencia bibliográfica
Atmospheric Measurement Techniques, Volume 7, Issue 9, 2014, pp.3139-3150
Advertised on:
9
2014
Número de citas
15
Número de citas referidas
15
Descripción
This paper presents the reconstruction of the 80-year time series of
daily global solar radiation (GSR) at the subtropical high-mountain
Izaña Atmospheric Observatory (IZO) located in Tenerife (The
Canary Islands, Spain). For this purpose, we combine GSR estimates from
sunshine duration (SD) data using the Ångström-Prescott
method over the 1933/1991 period, and GSR observations directly
performed by pyranometers between 1992 and 2013. Since GSR measurements
have been used as a reference, a strict quality control has been applied
based on principles of physical limits and comparison with LibRadtran
model. By comparing with high quality GSR measurements, the precision
and consistency over time of GSR estimations from SD data have been
successfully documented. We obtain an overall root mean square error
(RMSE) of 9.2% and an agreement between the variances of GSR estimations
and GSR measurements within 92%. Nonetheless, this agreement
significantly increases when the GSR estimation is done considering
different daily fractions of clear sky (FCS). In that case, RMSE is
reduced by half, to about 4.5%, when considering percentages of FCS >
40% (~ 90% of days in the testing period). Furthermore, we prove that
the GSR estimations can monitor the GSR anomalies in consistency with
GSR measurements and, then, can be suitable for reconstructing solar
radiation time series. The reconstructed IZO GSR time series between
1933 and 2013 confirms change points and periods of increases/decreases
of solar radiation at Earth's surface observed at a global scale, such
as the early brightening, dimming and brightening. This fact supports
the consistency of the IZO GSR time series presented in this work, which
may be a reference for solar radiation studies in the subtropical North
Atlantic region.
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