Influences of atmospheric conditions and air mass on the ratio of ultraviolet to total solar radiation

Riordan, C.; Hulstrom, R.; Myers, D.

doi:10.2172/6344084

Cited by 23 publications

(18 citation statements)

References 28 publications

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“…For instance, the clearness index k T , defined as the ratio of the total irradiation on a horizontal surface I T to the extraterrestrial solar irradiation on a horizontal surface I 0 , represents the overall atmospheric transmission conditions. Martínez-Lozano et al (1994) considered that the relation between I TUV /I T and k T proposed by Elhadidy et al (1990) and Riordan et al (1990) is poorly correlated. It is possible to consider k T as an index that describes the overall atmospheric transmission (due to all absorption and scattering processes) and influences in a similar way the UV spectral band and the rest of the spectrum.…”

Section: Relationship Between I Tuv and K Tmentioning

confidence: 99%

“…There is, therefore, considerable interest in finding simple relations between I T and I TUV , and to thus establish a first approximation to the broad band UV climatology. Relations of this type have been proposed by different investigators with values corresponding to periods of less than an hour (Stewart, 1980;Khun and Rau, 1990;Riordan et al, 1990;Mehos et al, 1991), hourly values (Zavodska and Reichrt, 1985;Khogali and Al-Bar, 1992), daily values (Yamasaki, 1983;Baker-Blocker et al, 1984;Nagaraja Rao et al, 1984;Zavodska and Reichrt, 1985;Blumthaler et al, 1992;Feister and Grasnick, 1992), monthly mean hourly values (Feister and Grasnick, 1992) and monthly mean daily values (Schulze and Grafe, 1969;Al-Aruri et al, 1988;Al-Aruri, 1990;Elhadidy et al, 1990;Khogali and Al-Bar, 1992;Al-Aruri and Amer, 1993). This paper presents the results obtained from the analysis of 6 years of UV and global broad band irradiance measurements in Valencia, Spain.…”

Section: Introductionmentioning

confidence: 99%

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Ratio of UV to global broad band irradiation in Valencia, Spain

1999

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This paper presents the results of an analysis of 6 years of measurements of UV and broad band irradiation values in Valencia, Spain. Hourly and daily integrated UV irradiance, ITUV, measured by a TUVR Eppley radiometer, and global irradiance IT from a Kipp‐Zonen CM‐11 pyranometer, were highly correlated, with ITUV/IT percentages varying from 2.9% to 3.5% for hourly values and from 2.9% to 3.4% for daily values. If a general linear relation ITUV=mIT is considered, the correlation coefficient r is always greater than 0.96 for hourly values and 0.91 for daily values. However, the relation between ITUV/IT and the clearness index kT is poorly correlated, although improved results, with less dependence on a specific location, can be observed using the kTUV and kT clearness indices. For a general linear relation, kTUV=mkT, the correlation coefficient r is always greater than 0.89 for hourly values and 0.86 for daily values. Copyright © 1999 Royal Meteorological Society

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Section: Relationship Between I Tuv and K Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ratio of UV to global broad band irradiation in Valencia, Spain

1999

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“…Under these conditions, Mehos et al (1992) and Riordan et al (1990) have established that errors associated with the experimental data are conservatively estimated at 15%, which is not in accordance with the expectation of the manufacturer (5%).…”

Section: Srgv and Experimental Campaign Databasesmentioning

confidence: 95%

Selection of cloudless sky conditions by applying solar global ultraviolet irradiance measurements

Serrano

Boscà

2013

Atmospheric Research

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Taking advantage of UV (290295-385 nm) irradiance measurements is one of the objectives of this paper.A new index termed k t '' is established for this band. This new index works as a 'zenith angle independent clearness index' for band measurements and has similar applications to those of k t ' for broadband measurements. The new index may be applied to identify cloudless instants from UV band measurements.

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“…The literature reflects the wide range of hourly values for the terrestrial ratio UV/global found for different locations, varying from 2% to 8% (BakerBlocker et al, 1984, Al-Aruri, 1988Riordan et al, 1990). A part of this variability is explained by the strong spectral dependence of the atmospheric transmittance of the solar spectrum with the traversed optical air mass, which causes a differential behaviour of the incoming solar UV radiation and broadband global radiation.…”

Section: Introductionmentioning

confidence: 99%

Determination of daily solar ultraviolet radiation using statistical models and artificial neural networks

2006

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Abstract. In this study, two different methodologies are used to develop two models for estimating daily solar UV radiation. The first is based on traditional statistical techniques whereas the second is based on artificial neural network methods. Both models use daily solar global broadband radiation as the only measured input. The statistical model is derived from a relationship between the daily UV and the global clearness indices but modulated by the relative optical air mass. The inputs to the neural network model were determined from a large number of radiometric and atmospheric parameters using the automatic relevance determination method, although only the daily solar global irradiation, daily global clearness index and relative optical air mass were shown to be the optimal input variables. Both statistical and neural network models were developed using data measured at Almería (Spain), a semiarid and coastal climate, and tested against data from Table Mountain (Golden, CO, USA), a mountainous and dry environment. Results show that the statistical model performs adequately in both sites for all weather conditions, especially when only snow-free days at Golden were considered (RMSE=4.6%, MBE= -0.1%). The neural network based model provides the best overall estimates in the site where it has been trained, but presents an inadequate performance for the Golden site when snow-covered days are included (RMSE=6.5%, MBE= -3.0%). This result confirms that the neural network model does not adequately respond on those ranges of the input parameters which were not used for its development.

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Influences of atmospheric conditions and air mass on the ratio of ultraviolet to total solar radiation

Cited by 23 publications

References 28 publications

Ratio of UV to global broad band irradiation in Valencia, Spain

Ratio of UV to global broad band irradiation in Valencia, Spain

Selection of cloudless sky conditions by applying solar global ultraviolet irradiance measurements

Determination of daily solar ultraviolet radiation using statistical models and artificial neural networks

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