The influence of cloudiness on UV global irradiance (295–385 nm)

Foyo-Moreno, I.; Alados, I.; Olmo, F.J.; Alados-Arboledas, Lucas

doi:10.1016/j.agrformet.2003.08.023

Cited by 89 publications

(71 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…cloudless sky) total global solar radiation (for example, Foyo-Moreno et al 2003). The cloud cover was determined through the visual determination by trained observers.…”

Section: Introductionmentioning

confidence: 99%

“…These authors developed a function that provided the modification of the UV based on the modification of the total global solar irradiance due to cloud. Foyo-Moreno et al (2003) have developed an empirical model to estimate the solar UV that employs the optical air mass, the extraterrestrial solar UV and the measured global broadband hemispherical transmittance. A method to reconstruct the UV in the Netherlands has been reported that employs the reduction by cloud in the global broadband solar radiation to determine the UV exposures (den Outer 2005).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cloud observations for the statistical evaluation of the UV index at Toowoomba, Australia

et al. 2007

View full text Add to dashboard Cite

show abstract

“…cloudless sky) total global solar radiation (for example, Foyo-Moreno et al 2003). The cloud cover was determined through the visual determination by trained observers.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cloud observations for the statistical evaluation of the UV index at Toowoomba, Australia

et al. 2007

View full text Add to dashboard Cite

show abstract

“…Though the impact of clouds on UV radiation is not the subject of this study, Foyo-Moreno et al (2003) found that clouds can increase the ratios of UV/G because clouds do not decrease UV radiation as much as global radiation. The similar result was obtained by Krzyscin et al (2003) at Belski, Poland.…”

Section: Introductionmentioning

confidence: 99%

Estimation of clear‐sky effective erythema radiation from broadband solar radiation (300–3000 nm) data in an arid climate

Sabziparvar

2009

Intl Journal of Climatology

View full text Add to dashboard Cite

This study reports the first observations of effective erythema radiation (EER) from an arid region of Iran. The hourly and daily measured clear-sky global solar radiation (G) and biologically important EER incident on a horizontal surface at Esfahan, Iran, during 2002Iran, during -2004 are used. The EER irradiation was recorded by a spectrophotometer Brewer type MK IV mounted on the roof of the Esfahan site. The total daily broadband radiation was measured using an Eppley Pyranometer (Kipp & Zonen CM) at the same site. Using the mentioned experimental data, a linear relationship (EER = β × G + α) is established between daily integrated totals of EER and the daily totals of broadband global solar radiation (300-3000 nm). At statistically significant levels (p < 0.05 and R 2 > 0.92) a good linear correlation between the daily G and EER was found. The observed (G) data is a routine meteorological measurement at many meteorological stations and such a relationship would enable estimates of the daily EER to be made from accessible records. The seasonal variability of EER/G is also discussed. The effect of the annual cycles of solar zenith angle (SZA) and total column ozone (TCO) on the ratios (EER/G) is presented and the correction factors are determined for the inclusion of the ozone cycle.

show abstract

“…The effect of cloud on UV irradiance has been studied in the past by means of observations and modelling Estupinan et al, 1996;Mateos et al, 2011;Moreno et al, 2003;Seckmeyer et al, 1996). These studies largely focus on UV erythemal irradiance and cloud modification factor, which is defined as the ratio of UV irradiance under cloudy condition to clear sky UV irradiance.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to Earth's hydrological cycle (Lin et al, 2000), cloud properties are also crucial to global climate studies (Nakajima and King, 1990). In particular, clouds modulate solar radiation intensity in the Earth-atmosphere system (Kidder and Vonder Haar, 1995) and play an important role in variation of UV irradiance at the surface of the Earth (Lubin and Jensen, 1995;Moreno et al, 2003). The UV radiation, in particular UV-A and UV-B radiations, reaching the Earth's surface (Kudish and Evseev, 2000), act efficiently in driving the atmospheric chemistry at the surface by affecting different photolysis reactions (Madronich, 1987;Monks et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Estimating cloud optical thickness and associated surface UV irradiance from SEVIRI by implementing a semi-analytical cloud retrieval algorithm

et al. 2012

View full text Add to dashboard Cite

Abstract. In this paper, we describe the implementation of the Semi-Analytical Cloud Retrieval Algorithm (SACURA), to obtain scaled cloud optical thickness (SCOT) from satellite imagery acquired with the SEVIRI instrument and surface UV irradiance levels. In estimation of SCOT particular care is given to the proper specification of the background (i.e. cloud-free) spectral albedo and the retrieval of the cloud water phase from reflectance ratios in SEVIRI's 0.6 µm and 1.6 µm spectral bands. The SACURA scheme is then applied to daytime SEVIRI imagery over Europe, for the month of June 2006, at 15-min time increments. The resulting SCOT fields are compared with values obtained by the CloudSat experimental satellite mission, yielding a negligible bias, correlation coefficients ranging from 0.51 to 0.78, and a root mean square difference of 1 to 2 SCOT increments. These findings compare favourably to results from similar intercomparison exercises reported in the literature. Based on the retrieved SCOT from SEVIRI and radiative transfer modelling approach, simple parameterisations are proposed to estimate the surface UV-A and UV-B irradiance. The validation of the modelled UV-A and UV-B irradiance against the measurements over two Belgian stations, Redu and Ostend, indicate good agreement with the high correlation, index of agreement and low bias. The SCOT fields estimated by implementing SACURA on imagery from geostationary satellite are reliable and its impact on surface UV irradiance levels is well produced.

show abstract

The influence of cloudiness on UV global irradiance (295–385 nm)

Cited by 89 publications

References 27 publications

Cloud observations for the statistical evaluation of the UV index at Toowoomba, Australia

Cloud observations for the statistical evaluation of the UV index at Toowoomba, Australia

Estimation of clear‐sky effective erythema radiation from broadband solar radiation (300–3000 nm) data in an arid climate

Estimating cloud optical thickness and associated surface UV irradiance from SEVIRI by implementing a semi-analytical cloud retrieval algorithm

Contact Info

Product

Resources

About