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| Titel |
Estimating solar ultraviolet irradiance (290-385 nm) by means of the spectral parametric models: SPCTRAL2 and SMARTS2 |
| VerfasserIn |
I. Foyo-Moreno, J. Vida, F. J. Olmo, L. Alados-Arboledas |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 18, no. 11 ; Nr. 18, no. 11, S.1382-1389 |
| Datensatznummer |
250014087
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| Publikation (Nr.) |
 copernicus.org/angeo-18-1382-2000.pdf |
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| Zusammenfassung |
Since the discovery of the ozone depletion in
Antarctic and the globally declining trend of stratospheric ozone concentration,
public and scientific concern has been raised in the last decades. A very
important consequence of this fact is the increased broadband and spectral UV
radiation in the environment and the biological effects and heath risks that may
take place in the near future. The absence of widespread measurements of this
radiometric flux has lead to the development and use of alternative estimation
procedures such as the parametric approaches. Parametric models compute the
radiant energy using available atmospheric parameters. Some parametric models
compute the global solar irradiance at surface level by addition of its direct
beam and diffuse components. In the present work, we have developed a comparison
between two cloudless sky parametrization schemes. Both methods provide an
estimation of the solar spectral irradiance that can be integrated spectrally
within the limits of interest. For this test we have used data recorded in a
radiometric station located at Granada (37.180°N, 3.580°W, 660 m a.m.s.l.), an
inland location. The database includes hourly values of the relevant variables
covering the years 1994-95. The performance of the models has been tested in
relation to their predictive capability of global solar irradiance in the UV
range (290–385 nm). After our study, it appears that information concerning the
aerosol radiative effects is fundamental in order to obtain a good estimation.
The original version of SPCTRAL2 provides estimates of the experimental values
with negligible mean bias deviation. This suggests not only the appropriateness
of the model but also the convenience of the aerosol features fixed in it to
Granada conditions. SMARTS2 model offers increased flexibility concerning the
selection of different aerosol models included in the code and provides the best
results when the selected models are those considered as urban. Although SMARTS2
provide slightly worse results, both models give estimates of solar ultraviolet
irradiance with mean bias deviation below 5%, and root mean square deviation
close to experimental errors.
Key words: Atmospheric composition and structure
(transmission and scattering of radiation) - Meteorology and atmospheric
dynamics (radiative process) |
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