Characteristics of longwave radiation through the statistical analysis of downward and upward longwave radiation and inter-comparison of two sites in Cyprus

Pashiardis, Stelios; Kalogirou, Soteris A.; Pelengaris, A

doi:10.1016/j.jastp.2017.08.007

Cited by 6 publications

(15 citation statements)

References 27 publications

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“…during midday are associated with the higher ground surface temperatures which are recorded at the station (Figure 6c,d). Similar variation of the above variables was also obtained for the period 2013-2015 [9]. The average hourly emissivity ( a  ) is 0.77 ± 0.08 and shows slightly lower values during the winter months and around 0.8 during the summer months when the weather conditions are more stable (Figure 6e).…”

supporting

confidence: 80%

“…Furthermore, Pashiardis et al [31] have analyzed the direct, diffuse, and global short-wave irradiation using three years of data. The characteristics of the longwave downward and upward irradiance at two sites in Cyprus were also presented by Pashiardis et al [9]. The paper has also evaluated various empirical models under clear-sky and all-sky conditions.…”

Section: Introductionmentioning

confidence: 93%

“…The longwave radiation components can be estimated by four different methods [9], i.e., (1) direct measurements by pyrgeometers in meteorological stations, which is the most accurate method; (2) simple physical or empirical models which are the most popular and use mainly temperature and relative humidity and follow the Stefan-Boltzmann equation with recalibration of the coefficients under local conditions; (3) radiative transfer models which are data demanding and use meteorological observations from different layers of the atmosphere; and (4) through satellite observations where their accuracy needs to be improved. As outlined earlier, most of these empirical equations follow the Stefan-Boltzmann law:…”

Section: Introductionmentioning

confidence: 99%

“…Secondly, the data were statistically analyzed to reveal the characteristics of longwave radiation on a monthly and hourly basis. Furthermore, we implement simple empirical models which were developed in a previous study under clear and all-sky conditions using local calibrated coefficients [9]. Finally, the net longwave radiation is calculated from the difference of downward and upward longwave irradiances and estimated from other models based on air temperature, relative humidity and global solar radiation.…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Downward and Upward Longwave Radiation at Athalassa, an Inland Location of the Island of Cyprus

Pashiardis

Kalogirou

2021

Applied Sciences

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In this study, two years of hourly longwave downward and upward irradiance measurements at Athalassa, an inland location, are used to analyze and compare them. A detailed quality control process was followed according to the suggested tests proposed by the Baseline Surface Radiation Network (BSRN) group. The criteria involved are based on physically possible, extremely rare and climatological limits. Furthermore, comparison tests were also applied between the two longwave components as well as with air and ground surface temperatures. Additionally, time consistency and persistency tests were applied. All the suspect data were excluded from the analysis. The data showed that the frequency distribution of downward longwave irradiances follows a normal distribution function, while the upward longwave follows an almost normal distribution but with a long positive tail. The annual mean daily downward longwave irradiation is 27.3 MJ m−2 and the annual mean daily upward longwave irradiation is 37.8 MJ m−2. The net longwave irradiation is always negative ranging from −5.9 to −12.1 MJ/m2. Various models were tested to estimate daylight and all day downward and upward longwave irradiances under clear-sky and all-sky conditions. For the comparison of measured and estimated values the root-mean-square errors and linear regression correlations have been used. The results of this comparison showed that Idso’s and Brunt’s models perform well, and they can be used to estimate downward longwave irradiance under clear-sky conditions. Furthermore, both models were extended to estimate the daylight downward longwave irradiance under all-sky conditions by taking into account the ratio of global to the clear-sky global solar irradiance. In this case, the RMSE of the local calibrated coefficients scheme of Idso’s model was 30.6 W m−2, while Brunt’s model showed slightly lower value (29.0 W m−2).

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supporting

confidence: 80%

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of Downward and Upward Longwave Radiation at Athalassa, an Inland Location of the Island of Cyprus

Pashiardis

Kalogirou

2021

Applied Sciences

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“…O balanço de radiação à superfície é importante para entender o sistema climático e sua variabilidade (PASHIARDIS et al, 2017). As radiações de ondas curtas (OC) e longas (OL) ascendentes (Rs) e descendentes (Ra) são os fluxos envolvidos nos processos de trocas de energia no sistema terraatmosfera.…”

unclassified

Variabilidade Estacional Do Balanço De Ondas Longas Em Um Ecossistema De Mata Atlântica No Estado De Alagoas-Brasil

Santos¹,

Querino²,

Silva³

et al. 2020

RCG

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O conhecimento do balanço de radiação ondas longas (BOL) é importante para determinação das trocas energéticas que ocorrem no sistema superfície-atmosfera. Assim, neste trabalho avaliou-se a variabilidade estacional do BOL numa área de Mata Atlântica, através da análise da influência de diferentes variáveis meteorológicas, discutindo suas possíveis causas. A pesquisa foi realizada numa Reserva Particular do Patrimônio Natural (RPPN) no município de Coruripe-AL. As medições foram feitas por um saldo radiômetro (CNR1, Kipp e Zonen) instalado acima do dossel florestal numa torre micrometeorológica de 26 metros de altura durante os períodos de 03.11.2016 a 31.12.2016 (estação seca) e 01.05.2017 a 30.06.2017 (estação chuvosa). O BOL variou em 101,63% da estação chuvosa para a seca (-11,6 W m-2 a -23,39 W.m-2) em dias nublados e 30,33% (-49,19 W.m-2 a -64,11 W.m-2) em dias claros. A radiação de onda longa atmosférica (Ra) média no período chuvoso foi 430,96 W.m-2 e 418,90 W.m-2 no seco, enquanto a radiação terrestre (Rs) foi 456,46 W.m-2 (chuvoso) e 470,60 W.m-2 (seco). Rs foi sempre maior que Ra e, por consequência, o BOL foi sempre negativo em ambas estações, com uma diferença média de 103,19% de uma estação para outra.

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Sensitivity of potential evapotranspiration to meteorological factors and their elevational gradients in the Qilian Mountains, northwestern China

Yang

Chen

Song

et al. 2019

Journal of Hydrology

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Characteristics of longwave radiation through the statistical analysis of downward and upward longwave radiation and inter-comparison of two sites in Cyprus

Cited by 6 publications

References 27 publications

Characteristics of Downward and Upward Longwave Radiation at Athalassa, an Inland Location of the Island of Cyprus

Characteristics of Downward and Upward Longwave Radiation at Athalassa, an Inland Location of the Island of Cyprus

Variabilidade Estacional Do Balanço De Ondas Longas Em Um Ecossistema De Mata Atlântica No Estado De Alagoas-Brasil

Sensitivity of potential evapotranspiration to meteorological factors and their elevational gradients in the Qilian Mountains, northwestern China

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