Clarity Index in the City of Manaus in Global Atmospheric Radiation Measurement
            Function by Meteorological Observation Station in the Amazon Ranking

Rodrigues, Vanise dos Santos; Nunes, Marcus Vinícius Alves; Silva, Vilmara Souza e; Rodrigues, Greyce dos Santos; Ramkeerat, Philip Floriano Rodrigues; Batista, Célia Maria Nogueira; Moraes, Wellington de Araújo

doi:10.5935/2447-0228.20160050

Cited by 2 publications

(4 citation statements)

References 5 publications

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“…No dia 26 de março a temperatura mais alta obtida foi de 130ºC às 13h:30min e no dia 6 de abril a mais elevada foi de 127ºC às 13h:05min. As temperaturas obtidas possuem altas variações ao longo do dia, pois nos meses de março e abril, conforme Rodrigues et al (2016), a radiação solar na cidade de Manaus é inferior à 15 MJ/m². E de acordo com Tiba et al (2000), nos meses de março e abril Manaus tem a insolação média mensal de 4h e 3h, respectivamente.…”

Section: Resultsunclassified

“…E de acordo com Tiba et al (2000), nos meses de março e abril Manaus tem a insolação média mensal de 4h e 3h, respectivamente. Essas temperaturas tendem a aumentar ao longo do ano até o mês de novembro no qual nota-se uma redução significativa de radiação solar na região metropolitana de Manaus, pois, ainda conforme Rodrigues et al (2016) e o Tiba et al (2000), é possível observar que os meses de julho à outubro possuem altos índices de irradiação solar chegando à 18 MJ/m² e tendo a variação de insolação média mensal de 5-7h por dia, então ao utilizar o equipamento nessa época este poderia alcançar temperaturas mais elevadas. A Figura 4 mostra como estão localizados os equipamentos construídos já mencionados na metodologia desse trabalho.…”

Section: Resultsunclassified

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Construção De Um Extrator Solar De Óleos Essenciais De Plantas Aromáticas E Medicinais Da Amazônia

Sousa¹,

Aum²,

Cavalcante³

et al. 2019

Blucher Chemical Engineering Proceedings

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Section: Resultsunclassified

Construção De Um Extrator Solar De Óleos Essenciais De Plantas Aromáticas E Medicinais Da Amazônia

Sousa¹,

Aum²,

Cavalcante³

et al. 2019

Blucher Chemical Engineering Proceedings

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“…The clearness index is a basic component for determining through parameterization the conditions of the sky in a certain place, which allows evaluating the transition conditions between a completely overcast sky to a clear sky with low turbidity. The assessment of 𝑘 𝑡 is made for various averaging time scales [21][22][23][24]:…”

Section: Introduction (Analysis Of Recent Research and Publications)mentioning

confidence: 99%

“…Sky condition indicates presence or absence of clouds in the time-space scale based on clearness index evaluation. According to the actual cloud cover, sky condition can be classified as "overcast" when clearness index is within the range of 0-0.3; "partly cloudy" (within 0.3-0.65); "clear" when the clearness index is within 0.65-1.0 [21].…”

Section: Introduction (Analysis Of Recent Research and Publications)mentioning

confidence: 99%

Evaluation of atmosphere clearness and cloudiness parameters in the southern regions of Ukraine using statistical analysis

Zatula

Kyhtenko

Oliinyk

et al. 2021

Visnyk of V.N. Karazin Kharkiv National University, Series Geology. Geography. Ecology

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Introduction. This paper deals with the specific aspects of insolation of the terrestrial surface in the southern regions of Ukraine, namely the clearness index and diffuse fraction of the atmosphere. The study was based on satellite data of the average daily insolation and total cloudiness in the nodes of the two-degree grid for the domain with coordinates 48°-45° N and 29°-39° E for the period of 1981-2020. The purpose of article. The purpose was to develop statistic models of horizontal surface insolation for various locations of study domain. Main focus was put on special characteristics in conditions of fixed cloudiness. Satellite data for the summer season had been used to evaluate the maximum solar energy potential of Ukraine. Methods. Application statistical analysis and means of cartographic data layout were used in the paper. Results. It was found that with the highest (more than 50%) frequency the total cloud cover can be characterized by the atmosphere clarity corresponding to a clear sky condition. The significance of irradiation of the terrestrial surface with diffuse solar radiation has been observed, with the share of such radiation in the global irradiation (diffuse ratio) being closely inversely related to the clearness index (correlation about -0.97). In turn, both diffuse ratio and clearness index are statistically dependent on the sky clarity, that allowed deriving analytical functions - diffuse ratio and clearness index - of the sky clarity, which appeared to be S- and Z-shaped curves, respectively. Dispersion of the clearness index ( ) and the diffuse fraction ( ) values and the strength of their statistical relationship significantly depend on the sky clarity. The empirical distribution of the two-dimensional random variable ( ; ) well meets the Gaussian distribution, and the obtained dispersion ellipses allowed calculating the confidence intervals of the two-dimensional random variable (clearness index: diffuse fraction) for a given confidence level. The spatial distribution of the clearness index and diffuse fraction of the atmosphere in the southern regions of Ukraine revealed a significant dependence of these indices on the latitude and the type of underlying surface. At the end of the summer a seasonal effect has been observed in the spatial distribution of the clearness index and diffuse fraction, which can be explained by the specific seasonal features of atmospheric circulation, caused by the spreading out of the eastern ridge of the Azores anticyclone and the general situation with blocking developments in the Atlantic-European sector of the Northern Hemisphere. The scientific novelty. Correlation and regression models of special insolation characteristics in conditions of various cloudiness that are represented in this paper are new to Ukraine. Analysis of two-dimensional random value spread (clearness index: cloudiness index) allowed to assess probabilities of integral solar radiation flows. The obtained analytical membership functions for monthly average values of clearness and cloudiness indices depending on the level of sky clarity proved to be applicable for determining respective indices for daily time scale. Practical significance. The obtained results are important for comprehensive assessment of the solar / photovoltaic resources of southern regions of Ukraine. Specifically, analytical dependences have practical values for the purpose of forecasting direct and diffuse solar radiation in various time scales based on publically available global records of solar radiation.

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Clarity Index in the City of Manaus in Global Atmospheric Radiation Measurement Function by Meteorological Observation Station in the Amazon Ranking

Cited by 2 publications

References 5 publications

Construção De Um Extrator Solar De Óleos Essenciais De Plantas Aromáticas E Medicinais Da Amazônia

Construção De Um Extrator Solar De Óleos Essenciais De Plantas Aromáticas E Medicinais Da Amazônia

Evaluation of atmosphere clearness and cloudiness parameters in the southern regions of Ukraine using statistical analysis

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