The Estimation of Hourly Global Solar Radiation Using a Cloud Cover Model Developed at Blytheville, Arkansas

Turner, W. D.; Mujahid, A. M.

doi:10.1175/1520-0450(1984)023<0781:teohgs>2.0.co;2

Cited by 15 publications

(6 citation statements)

References 6 publications

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“…Following the empirical model, described by equations 12–14 of Turner and Mujahid (), where this quantified cloudiness is used as input data, we were able to extract the solar radiation profile through equation . Having this information, and applying the obscuration function, we were led to the solar radiation empirical profile affected not only by the solar eclipse itself but also by clouds (Figures and ).…”

Section: Discussionmentioning

confidence: 99%

“…The sky solar radiation on a cloudy day mainly depends on the thickness and type of clouds (Kasten & Czeplak, ) and on the solar elevation. Turner and Mujahid (), in trying to present an empirical model to estimate the global solar radiation using a cloud cover scheme developed at Blytheville, Arkansas, found that such a scheme could be given in terms of total sky cover, TSC (or cloudiness in tenths) and cloud cover (cc), which represents the attenuation effect of different cloud‐type groups. The relationships between these two variables, expressed in tenths, as reported by these latter authors, are as follows:

cc = TSC ((), in tenths), for low clouds, middle clouds, or low and middle clouds .

cc = 0 . 5TSC ((), in tenths) for high clouds .

cc = TSC ((), in tenths) - 0.5 ((), amount of high clouds in tenths) for mixed clouds .

…”

Section: Models Of the Solar Radiation Under Occultation Of The Sun Bmentioning

confidence: 99%

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Cloudiness and Solar Radiation During the Longest Total Solar Eclipse of the 21st Century at Tianhuangping (Zhejiang), China

Peñaloza-Murillo

Pasachoff

2018

JGR Atmospheres

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The lack of comprehensive solar radiation monitoring during the longest total solar eclipse of the 21st century at Tianhuangping (Zhejiang), China, on 22 July 2009, has led to this investigation in order to evaluate the cloudiness contribution in estimating the impact on global solar radiation throughout this phenomenon. In doing so, we applied a cloud cover empirical model to obtain the global solar radiation and, at the same time, we deduced a theoretical model to get the direct solar radiation in which both the occultation and obscuration functions of this eclipse are included. We took limb darkening and atmospheric transmission into account. Though the weather during our eclipse observations agreed with the forecasts for that day, clouds and some rain, we were nonetheless able to observe all phases of the eclipse from our observation site at Tianhuangping. This experience suggests that for coming eclipses a record of the in situ observation protocol of cloudiness is mandatory. Our results for comparing global solar radiation models indicate that our total solar eclipse radiation model is quite acceptable and representative of that which could have happened at that time.Plain Language Summary A total solar eclipse is a situation where the Sun is obscured by the Moon viewed from Earth. In this particular arrangement in space a shadow is cast over a particular region. Thus, the ideal circumstances to observe a total solar eclipse are those in which the sky is cloudless in that region or zone. Yet from time to time this phenomenon occurs in the presence of interfering clouds preventing a direct observation of the event. However, under these adverse circumstances effects over the environment can still be felt and measured as, for example, the rapid reduction of solar energy reaching the surface. In that case such measurements would be lacking, but with some information about cloudiness one can have an idea of how the variation of this energy during the eclipse took place. In the procedure a quantitative knowledge of how the Moon disk is going to progressively cut the Sun's brightness during the eclipse is necessary. From an environmental point of view it is shown that a scientific observation of a total solar eclipse matters even though it was made under the influence of blocking clouds.

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Section: Discussionmentioning

confidence: 99%

cc = TSC ((), in tenths), for low clouds, middle clouds, or low and middle clouds .

cc = 0 . 5TSC ((), in tenths) for high clouds .

cc = TSC ((), in tenths) - 0.5 ((), amount of high clouds in tenths) for mixed clouds .

…”

Section: Models Of the Solar Radiation Under Occultation Of The Sun Bmentioning

confidence: 99%

Cloudiness and Solar Radiation During the Longest Total Solar Eclipse of the 21st Century at Tianhuangping (Zhejiang), China

Peñaloza-Murillo

Pasachoff

2018

JGR Atmospheres

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“…Hence, the cloud cover fraction (cc) on days selected as overcast by the model is assumed to be equal to the maximum sky cover fraction (cc = 1) Turner and Abdulaziz (1984) developed an empirical equation to calculate the sky transmittance of overcast days as a function of the solar elevation and the cloud cover fraction. The equation has the following form:…”

Section: Predicting Mean Sky Transmittance Of Overcast Days (Kt) Omentioning

confidence: 99%

Predicting Solar Radiation for Tropical Islands From Rainfall Data

Sendanayake¹,

Miguntanna²,

Jayasinghe³

2016

J. Urb. and Environ. Engng

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Abstract:There are many correlations developed to predict incident solar radiation at a given location developed based on geographical and meteorological parameters. However, all correlations depend on accurate measurement and availability of weather data such as sunshine duration, cloud cover, relative humidity, maximum and minimum temperatures etc, which essentially is a costly exercise in terms of equipment and labour. Sri Lanka being a tropical island of latitudinal change of only 30 along the length of the country, the meteorological factors govern the amount of incident radiation. Considering the cloud formation and wind patterns over Sri Lanka as well as the seasonal rainfall patterns, it can be observed that the mean number of rainy days can be used to predict the monthly average daily global radiation which can be used for calculations in solar related activities conveniently.

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“…A variety of approaches have been used to estimate the solar radiation at the ground surface, but often rather complex input information is required (Thomas and Norris, 1982;Turner and Mujahid, 1984). For this study a very simple method was developed that gives satisfactory results.…”

Section: Modelling Of Solar Radiation On Slopesmentioning

confidence: 99%

Studies of surface energy balance of sloping terrain

Oliver¹

1992

Intl Journal of Climatology

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Measurements of radiation and soil energy balance components were made for a complete solar season on a south and north facing slope on the edge of the Chilterns, England.The contrasts between the two slopes are illustrated on both the diurnal and seasonal time-scale. It is shown that a consistent relationship exists between daily solar and net radiation totals for the slopes throughout the year but that soil heat flux cannot be modelled easily. Further, it is shown that it is possible to derive a simple model of solar radiation on to a slope from measurements made on the horizontal.Combining these conclusions points the way towards simple routine calculation of slope radiation balances for use in energy and evaporation models over undulating terrain.

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The Estimation of Hourly Global Solar Radiation Using a Cloud Cover Model Developed at Blytheville, Arkansas

Cited by 15 publications

References 6 publications

Cloudiness and Solar Radiation During the Longest Total Solar Eclipse of the 21st Century at Tianhuangping (Zhejiang), China

Cloudiness and Solar Radiation During the Longest Total Solar Eclipse of the 21st Century at Tianhuangping (Zhejiang), China

Predicting Solar Radiation for Tropical Islands From Rainfall Data

Studies of surface energy balance of sloping terrain

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