Illuminance turbidity parameters and atmospheric extinction in the visible spectrum

Gueymard, Christian A.; Kambezidis, H. D.

doi:10.1002/qj.49712353908

Cited by 23 publications

(15 citation statements)

References 27 publications

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“…A set of simple formulas links different broadband optical parameters like the Bouguer coefficient of transparency, transmittance, optical depth, the Linke turbidity factor . Concerning aerosol optics, the same reference air mass is also recommended (Gueymard and Kambezidis, 1997).…”

Section: A Three-layer Structure Of Column Broadband Transmittancementioning

confidence: 99%

A shortcut from broadband to spectral aerosol optical depth

Kannel¹,

Ohvril²,

Okulov³

2012

Proc. Estonian Acad. Sci.

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The concept behind the shortcut idea is a close correlation between column broadband aerosol optical depth (BAOD) and aerosol optical depth at 500 nm (AOD500). The method uses only two input parameters: (a) the Bouguer broadband coefficient of column transparency for optical mass m = 2 (solar elevation about 30°) and (b) integrated column precipitable water vapour which can be roughly estimated using surface water vapour pressure. In creating the method, a large database, including almost 20 000 complex, spectral and broadband direct solar beam observations at Tõravere, Estonia, during all seasons of a 8-year period, 2002-2009, was used. The AOD500 observations were performed by the NASA project AERONET and the broadband direct beam ones by the Estonian Meteorological and Hydrological Institute. Analysis of this database revealed a high correlation between BAOD and AOD500 which enabled transition from broadband to spectral AOD. Almost 82% of the observations in the database belonged to lower turbidities when AOD500 < 0.2. The root mean square deviation (RMSD) for AOD500 prediction in this range was 0.022. For AOD500 = 0.2-0.4, the RMSD was 0.035, for 0.4-0.6, the RMSD was 0.042. Relative RMSD for these ranges was about 22%, 12%, and 9%, respectively. For AOD500 > 0.6, relative RMSD remained 9%. For comparison, the same database was used to test Gueymard's broadband parameterization based on his SMARTS2 classic model. The last one, apparently due to problems with circumsolar radiation, slightly but systematically underestimated the AOD500. However, there was a close correlation between our shortcut results and Gueymard's broadband parameterization.

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Section: A Three-layer Structure Of Column Broadband Transmittancementioning

confidence: 99%

A shortcut from broadband to spectral aerosol optical depth

Kannel¹,

Ohvril²,

Okulov³

2012

Proc. Estonian Acad. Sci.

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“…The use of such codes presumes knowledge of the atmospheric turbidity in the visible spectrum. 13–15…”

Section: Introductionmentioning

confidence: 99%

“…The use of such codes presumes knowledge of the atmospheric turbidity in the visible spectrum. [13][14][15] Daylight undergoes variations at scales from seasonal to multi-decadal as much as solar radiation. Nevertheless, SSI has not been given as much attention as solar radiation.…”

Section: Introductionmentioning

confidence: 99%

“…The daylight climate at a location provides the levels and trends of the SSI components (global, diffuse, and direct) for a long period (usually equal or longer than 10 years). It is known that clouds and atmospheric aerosols attenuate SSI 14 ; therefore, these two factors play an executive role in establishing the daylight climate in a region. Clouds and atmospheric aerosols are statistically varying in space and time, thus causing an analogous statistical variability in the SSI levels.…”

Section: Introductionmentioning

confidence: 99%

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The daylight climate of Athens: Variations and tendencies in the period 1992–2017, the brightening era

Kambezidis

2019

Lighting Research & Technology

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Though numerous daylight studies have been conducted worldwide, works for the daylight climate and/or the daylight variations/trends are rare. This gap is treated here. Therefore, the innovative trend analysis and the month–hour diagrams are applied to the illuminance time series at Athens over the period of 1992–2017 under all-/clear-sky conditions. For all skies, the global illuminance shows a broad maximum at summer noon, while the diffuse counterpart is in spring. Under clear skies, the global illuminance maximum becomes broader, covering spring/summer. However, the diffuse illuminance maximum splits into minor ones in April and June. The innovative trend analysis method finds that the identified trends are + 2.83%/decade (−1.89%/decade) for the global (diffuse) illuminance, under all skies. In clear skies, the above values are modified to +2.66%/decade (−2.00%/decade). These results confirm a recovery in the Athens daylight levels as in the solar radiation ones found by many researchers. Another outcome of the study concerns the observed decline in diffuse illuminance levels in the examined period, which may be attributed to a decline in cloudiness and an increase of sunshine over the area. Also, the variation of the global and diffuse illuminance efficacies on a month–hour basis is examined using the month–hour diagram method.

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“…That, of course, presumes knowledge of the atmospheric turbidity in the visible spectrum. [8][9][10] This work presents an analysis of the global and diffuse horizontal illuminances in the Athens area in the period 1992-1997. Kambezidis et al 11 have presented the distribution of the above parameters for the year 1992 only.…”

Section: Introductionmentioning

confidence: 99%

Daylight climatology in the Athens urban environment: guidance for building designers

Kambezidis

Oikonomou

Zevgolis

2002

Lighting Research & Technology

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Global and diffuse horizontal illuminance data are analysed for Athens, Greece, for the period 1992-1997. It is shown in a graphical manner that horizontal illuminance (global and diffuse) is dependent upon the time of the day and the month of the year. The diagrams are categorized according to Perraudeau's nebulosity index, which re ects the sky cover and the climate at a given area. The cumulative frequency distribution of the parameters under all-sky types are estimated and discussed. Some examples of sky-luminance distributions using appropriate software are given. The conclusions are of potential value to local architectural practice, installations of lighting, and in developing an energy-saving policy for the Athens region.

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Illuminance turbidity parameters and atmospheric extinction in the visible spectrum

Cited by 23 publications

References 27 publications

A shortcut from broadband to spectral aerosol optical depth

A shortcut from broadband to spectral aerosol optical depth

The daylight climate of Athens: Variations and tendencies in the period 1992–2017, the brightening era

Daylight climatology in the Athens urban environment: guidance for building designers

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