A simple hourly clear-sky solar radiation model based on meteorological parameters

Sherry, J.E.; Justus, C. G.

doi:10.1016/0038-092x(83)90112-3

Cited by 21 publications

(8 citation statements)

References 9 publications

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“…This uncertainty hampers attempts to model irradiance at the Earth's surface under natural atmospheric conditions. Many models of solar irradiance apply to clear-sky conditions only [e.g., Leckner, 1978;Sherry and Justus, 1983;Bird and Riotdan, 1986;Gregg and Carder, 1990;Gueymard, 1995]. Several methods have been used to incorporate the effect of clouds into such mod-face of clouds back to space.…”

Section: Introductionmentioning

confidence: 99%

The spectral effects of clouds on solar irradiance

Bartlett¹,

Ciotti²,

Davis³

et al. 1998

J. Geophys. Res.

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Abstract.Knowledge of th,e spectral attenuation associated with clouds is important for accurate estimates of natural irradiance at the Earth's surface. We compare spectral measurements of visible downwelling irradiance, under varying sky conditions at Halifax, Nova Scotia, Canada, with results from a clear-sky model. The spectral effect of clouds is estimated by taking the ratio of the measurements to the modeled irradiances and removing spectrally consistent instrumental effects and errors in the model. Empirical relationships derived between the spectral cloud effect and both CF, the cloud factor (the ratio of measured to modeled irradiances at 490 nm), and f, the fraction of sky covered by cloud, were found to follow a wavelength (•) dependence of the form a(C'F or f)+ b(C'F or f)(•/490) -4 in the 412-700 nm wavelength range. Both this relationship and a previously published linear relationship were found to be inadequate for describing cloudy irradiance data from the Bering Sea, indicating that the spectral effect of clouds can vary with cloud type and location. We show here that the spectral cloud effect can be mimicked by using a clear-sky model and changing the magnitude of the sky reflectivity or the spectral shape and magnitude of the ground albedo within the model. An investigation of the effects of cloud-dependent changes in irradiance spectra on calculations of bio-optical properties is also presented. Estimates of chlorophyll concentration from near-surface radia, nces are found to vary by up to 30%, whereas the effects on estimates of photosynthetically available and usable radiation at the sea surface are negligible.

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Section: Introductionmentioning

confidence: 99%

The spectral effects of clouds on solar irradiance

Bartlett¹,

Ciotti²,

Davis³

et al. 1998

J. Geophys. Res.

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“…turbidity, water vapour and ozone columnal contents) and refer to an equivalent homogeneous atmosphere. Some of these models allow to compute only global values of irradiation [7][8][9][10][11][12], where other ones give the radiance spectrum and its components, both beam and diffuse [13][14][15][16]. All of these simplified models seem to produce results which are in good agreement with the more sophisticated (from the mathematical point of view) ones.…”

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confidence: 93%

A simple method to calculate average spectra of clear sky solar radiation and their dependence on the atmospheric parameters

Amato¹,

Cuomo²,

Guzzi

et al. 1985

Rev. Phys. Appl. (Paris)

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“…Among models that have been proposed to calculate clear sky solar radiation components on a horizontal surface, most consider a one-band calculation (ATWA- TER and BALL, 1978;HOYT, 1978;BARBARO et al, 1979;BIRD and HULSTROM, 1981;DAVIES and MCKAY, 1982;SHERRY and JUSTUS, 1983) or a two-band calculation (LACIS and HANSEN, 1974;PAULIN, 1980;GUEYMARD, 1989). The most sophisticated models are of the spectral type (BRASLAU and DAVE, 1973a,b;BIRD et al, 1983;KNEIZYS et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Broadband Model for Computation of Solar Radiation at the Earth’s Surface. Application to Mediterranean Climate

Psiloglou¹,

Santamouris

Asimakopoulos³

2000

Pure appl. geophys.

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This paper deals with a new broadband atmospheric model designed for predicting the total and diffuse solar radiation incident on the earth's surface in medium or large-sized coastal or near-coastal cities, under a clear or cloudy sky. The revised LABS (1981, 1984) solar spectrum is used. The atmospheric transmittance of each atmospheric parameter contributing to solar radiation depletion, water vapor, ozone, uniformly mixed gases, molecules and aerosols, is calculated using parameterized expressions resulting from integrated spectral transmittance functions. The beam and diffuse radiation components are obtained as a function of the specific atmospheric transmittances. The model requires the following parameters as inputs: total water vapor and ozone amount in a vertical column, sunshine duration and the surface albedo. The model has been used for validation purposes at two stations with slightly different characteristics (NOA and Penteli) in the Athens basin, where total and diffuse radiation measurements are available, for a period of 34 months for NOA and 23 for Penteli. The NOA station is located on a small hill (107 m a.m.s.l.) near the center of Athens, while the Penteli station (500 m a.m.s.l.) is situated in a relatively less polluted area in northern Athens. The clear sky part of the model was tested for 70 individual ''clear'' days with 2-minute intervals, while the whole model was checked with monthly ''mean'' days and mean hourly values. A close agreement between the calculated and the measured values of total and diffuse solar radiation is observed.

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A simple hourly clear-sky solar radiation model based on meteorological parameters

Cited by 21 publications

References 9 publications

The spectral effects of clouds on solar irradiance

The spectral effects of clouds on solar irradiance

A simple method to calculate average spectra of clear sky solar radiation and their dependence on the atmospheric parameters

Atmospheric Broadband Model for Computation of Solar Radiation at the Earth’s Surface. Application to Mediterranean Climate

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