ABSTRACT This chapter shows a comparative assessment of tilted diffuse solar irradiation models u... more ABSTRACT This chapter shows a comparative assessment of tilted diffuse solar irradiation models using hourly horizontal diffuse solar irradiation measurements. Detailed measurements on inclined and horizontal surfaces are carried out at the C.I.B.A. Laboratory of Valladolid (Spain) and are unique in the Castile and Leon region. Ten sky diffuse models are used to estimate diffuse irradiation on tilted surfaces. Root mean square and mean bias errors are used to determine the performance of each tilted diffuse model and a comparison among the results has been made. From the results it can be seen that Reindl and Pérez's models are better than the others and they are both recommended for predicting diffuse solar irradiation on tilted surfaces. The RMSE and MBE values of the models were calculated and compared for four clearness index values.
The study shows an analysis of a 7-year data set measuring Ultraviolet-B (UVB) irradiance values ... more The study shows an analysis of a 7-year data set measuring Ultraviolet-B (UVB) irradiance values and ultraviolet index TABLEUVI) values derived from ground-based broadband irradiance measurements, satellite-derived total ozone, and UVB solar irradiance recorded in Valladolid (Central Spain). Ultraviolet-B (UVB) solar irradiance measurements in the range (280–315 nm) carried out during the period 2013–2019 at a continental Mediterranean solar station, located in Valladolid (Spain), were analyzed. UVB data recorded using a YES UVB-1 pyranometer were used to estimate erythemal irradiance, ultraviolet erythemal irradiance (UVER), UVI, cumulative dose, and sun protection. Hourly UVER data in January (minimum values) and June (maximum values) were analyzed as an average year for the measurement station. Differences between UVI values at solar noon and the maximum daily value were minimal. It was found that on certain summer days, maximum daily UVI and SED (cumulative daily dose) could be ...
The Universities of Malta and Valladolid (Spain) developed a measurement campaign, which took pla... more The Universities of Malta and Valladolid (Spain) developed a measurement campaign, which took place in the Institute for Energy Technology in Marsaxlokk (Southern Malta) between May and October 2012, and it was supported by the Spanish government through the Project titled "Measurement campaign about Solar Radiation, Ozone, and Aerosol in the Mediterranean area" (with reference CGL2010-12140-E). This campaign provided the first ground-based measurements in Malta of erythemal radiation and UV index, which indicate the effectiveness of the sun exposure to produce sunburn on human skin. A wide variety of instruments was involved in the campaign, providing a complete atmospheric characterization. Data of erythemal radiation and UV index (from UVB-1 pyranometer), total shortwave radiaton (global and diffuse components from CM-6B pyranometers), and total ozone column, aerosol optical thickness, and precitable water column (from a Microtops-II sunphotometer) were available in the...
This paper presents the results of a study on daylight illuminance levels measured on horizontal ... more This paper presents the results of a study on daylight illuminance levels measured on horizontal and vertical surfaces. Firstly, an attempt to know the behavior of the daylight illumination in a specific area, as the ‘Castilla-Leon’ region, Spain, is made in order to determine the representative values of this parameter in this geographical area. With this aim, a series of
Journal of Atmospheric and Solar-Terrestrial Physics, 2008
... 1. Introduction. The UV-B solar irradiance (280–315 nm), representing less than 1% of the tot... more ... 1. Introduction. The UV-B solar irradiance (280–315 nm), representing less than 1% of the total radiation reaching the Earth's surface (Miguel et al., 2005), is a radiation of high energy and has a great interest due to its influence on the biosphere and biological processes. ...
ABSTRACT The water vapor column product from the MODIS instrument onboard the Terra satellite is ... more ABSTRACT The water vapor column product from the MODIS instrument onboard the Terra satellite is compared with ground-based measurements at six Spanish locations (AERONET stations) in the Iberian Peninsula. In addition, aerosol optical depth (AOD) at 443 nm and at 675 nm retrievals from the MISR instrument onboard the Terra satellite is also compared with ground-based measurements at the same locations to determine their uncertainties. Remote sensing data of water vapor and aerosol optical properties are averaged each month to obtain climatology tables and to characterize atmospheric properties at nine locations in the Iberian Peninsula. These tables are used as input in a radiative transfer model to calculate total shortwave (SW) and ultraviolet erythemal (UVER) irradiance at the nine locations. SW and UVER simulations are recalculated considering the uncertainties and the climatological variability of the input datasets. AOD uncertainty provides changes lower than 6% in most cases for both SW and UVER simulations. The propagation of water vapor uncertainty causes variations in SW simulations less than 4% for solar zenith angles below 75º.
Different meteorological data series called multiyear data, long-term average measured data serie... more Different meteorological data series called multiyear data, long-term average measured data series, or test reference years (TRYs) are required for solar energy system simulation. It is known that the use of the multiyear data approach requires a great effort in time and computation, long-term average measured data do not have the extreme values of weather data given along the year,
Abstract- The estimation of hourly and daily solar radiation values on inclined surfaces starts w... more Abstract- The estimation of hourly and daily solar radiation values on inclined surfaces starts with the determination of the corresponding hourly values on the horizontal plane. To serve the latter purpose the Meteorological Radiation Model was developed. The goal of the model is to estimate solar radiation at places where there are not available measurements. This work presents a theoretical description of the code and gives comparison between meas urements and estimated values for Athens, Lisbon and a Japanese location.
... Meteor. 28:711–721. [Abstract]. Bilbao, J., A. de Miguel, JA Medina, and JJ López. 1997. ... ... more ... Meteor. 28:711–721. [Abstract]. Bilbao, J., A. de Miguel, JA Medina, and JJ López. 1997. ... Phys. Appl. 21:211–218. de Miguel, A., J. Bilbao, R. Aguiar, H. Kambezidis, and E. Negro. 2001. Diffuse solar irradiation model evaluation in the north Mediterranean belt area. Sol. ...
Maximum (Tmax), minimum (Tmin), mean (Tmean) air temperature and diurnal temperature range (DTR) ... more Maximum (Tmax), minimum (Tmin), mean (Tmean) air temperature and diurnal temperature range (DTR) trends on a seasonal and annual time scale are evaluated from data recorded at nine Spanish weather stations during the period 1950–2011. Temporal and spatial variability in temperatures and in the diurnal temperature range (DTR) are presented. The non-parametric Theil-Sen approach and the Mann-Kendall test are used to evaluate anomaly temperature trends and their statistical significance, respectively. An air temperature reduction in Spain between 1950 and 1980 emerges and significant warming is observed between 1980 and 2011. On a seasonal scale, the weakest trends (mostly insignificant at the 5% confidence level) are noted during autumn, while the strongest warming rates were found during summer and spring. The rate of change between 1950 and 2011 in Tmax, Tmin and Tmean was 1.6 °C, 1.1 °C and 1.3 °C, respectively. DTR trends showed a decrease on the Mediterranean coast and a small ch...
ABSTRACT In order to study the characteristics of solar direct radiation and the atmospheric turb... more ABSTRACT In order to study the characteristics of solar direct radiation and the atmospheric turbidity in Valladolid, Spain, global, diffuse and direct irradiance data were recorded from May 2010 to December 2011, with a frequency of 10 minute. Measurements used were taken by the Energy and Atmosphere Group (http://www3.uva.es/renova), University of Valladolid, Spain at the Solar Radiometric Station (41,81°N 4.93°W, 840m a.s.l.) located on the Atmosphere Researcher Centre, Villalba de los Alcores, Valladolid, Spain. Sensors were installed in a Sun tracker (Solys 2, Kipp & Zonen) that blocks direct solar radiation using a shadow ball. The system consists of two pyranometers CMP-21 and one pyrheliometer CHP-1 (Kipp & Zonen), respectively. Based on these measurements, the characteristics of direct solar irradiance data were evaluated in order to know the main statistical parameters of the distribution. Angström turbidity coefficient values, beta, were estimated from direct solar irradiance and clear sky conditions. The beta coefficient values were obtained from MODIS satellite instrument, and the aerosol optical depth values, AOD(550nm), were evaluated. The turbidity coefficient beta shows seasonal variation, with higher values in summer (< 0.15) and lower in winter (< 0.05). It could be due to high temperatures in summer and less rainy days which would induce more atmospheric turbidity, increasing vertical convection and particles enhancement. The scattered graph of aerosol optical depth from satellite and the obtained from Angström expression has been plotted. The slope presents a value around the unity, 0.96, and the correlation coefficient shows a value of 0.6 . It was observed that turbidity coefficients increased in April 2011, and in order to now the origin the change, air masses trajectories, deduced from HYSPLIT model (http://ready.arl.noaa.gov/HYSPLIT.php) were studied. From the results it has been obtained that a situation of low pressures in the Atlantic Portuguese coast and high pressure in the North of Spain induced the movement of dust from Sahara desert into the Iberian Peninsula.
ABSTRACT This chapter shows a comparative assessment of tilted diffuse solar irradiation models u... more ABSTRACT This chapter shows a comparative assessment of tilted diffuse solar irradiation models using hourly horizontal diffuse solar irradiation measurements. Detailed measurements on inclined and horizontal surfaces are carried out at the C.I.B.A. Laboratory of Valladolid (Spain) and are unique in the Castile and Leon region. Ten sky diffuse models are used to estimate diffuse irradiation on tilted surfaces. Root mean square and mean bias errors are used to determine the performance of each tilted diffuse model and a comparison among the results has been made. From the results it can be seen that Reindl and Pérez's models are better than the others and they are both recommended for predicting diffuse solar irradiation on tilted surfaces. The RMSE and MBE values of the models were calculated and compared for four clearness index values.
The study shows an analysis of a 7-year data set measuring Ultraviolet-B (UVB) irradiance values ... more The study shows an analysis of a 7-year data set measuring Ultraviolet-B (UVB) irradiance values and ultraviolet index TABLEUVI) values derived from ground-based broadband irradiance measurements, satellite-derived total ozone, and UVB solar irradiance recorded in Valladolid (Central Spain). Ultraviolet-B (UVB) solar irradiance measurements in the range (280–315 nm) carried out during the period 2013–2019 at a continental Mediterranean solar station, located in Valladolid (Spain), were analyzed. UVB data recorded using a YES UVB-1 pyranometer were used to estimate erythemal irradiance, ultraviolet erythemal irradiance (UVER), UVI, cumulative dose, and sun protection. Hourly UVER data in January (minimum values) and June (maximum values) were analyzed as an average year for the measurement station. Differences between UVI values at solar noon and the maximum daily value were minimal. It was found that on certain summer days, maximum daily UVI and SED (cumulative daily dose) could be ...
The Universities of Malta and Valladolid (Spain) developed a measurement campaign, which took pla... more The Universities of Malta and Valladolid (Spain) developed a measurement campaign, which took place in the Institute for Energy Technology in Marsaxlokk (Southern Malta) between May and October 2012, and it was supported by the Spanish government through the Project titled "Measurement campaign about Solar Radiation, Ozone, and Aerosol in the Mediterranean area" (with reference CGL2010-12140-E). This campaign provided the first ground-based measurements in Malta of erythemal radiation and UV index, which indicate the effectiveness of the sun exposure to produce sunburn on human skin. A wide variety of instruments was involved in the campaign, providing a complete atmospheric characterization. Data of erythemal radiation and UV index (from UVB-1 pyranometer), total shortwave radiaton (global and diffuse components from CM-6B pyranometers), and total ozone column, aerosol optical thickness, and precitable water column (from a Microtops-II sunphotometer) were available in the...
This paper presents the results of a study on daylight illuminance levels measured on horizontal ... more This paper presents the results of a study on daylight illuminance levels measured on horizontal and vertical surfaces. Firstly, an attempt to know the behavior of the daylight illumination in a specific area, as the ‘Castilla-Leon’ region, Spain, is made in order to determine the representative values of this parameter in this geographical area. With this aim, a series of
Journal of Atmospheric and Solar-Terrestrial Physics, 2008
... 1. Introduction. The UV-B solar irradiance (280–315 nm), representing less than 1% of the tot... more ... 1. Introduction. The UV-B solar irradiance (280–315 nm), representing less than 1% of the total radiation reaching the Earth's surface (Miguel et al., 2005), is a radiation of high energy and has a great interest due to its influence on the biosphere and biological processes. ...
ABSTRACT The water vapor column product from the MODIS instrument onboard the Terra satellite is ... more ABSTRACT The water vapor column product from the MODIS instrument onboard the Terra satellite is compared with ground-based measurements at six Spanish locations (AERONET stations) in the Iberian Peninsula. In addition, aerosol optical depth (AOD) at 443 nm and at 675 nm retrievals from the MISR instrument onboard the Terra satellite is also compared with ground-based measurements at the same locations to determine their uncertainties. Remote sensing data of water vapor and aerosol optical properties are averaged each month to obtain climatology tables and to characterize atmospheric properties at nine locations in the Iberian Peninsula. These tables are used as input in a radiative transfer model to calculate total shortwave (SW) and ultraviolet erythemal (UVER) irradiance at the nine locations. SW and UVER simulations are recalculated considering the uncertainties and the climatological variability of the input datasets. AOD uncertainty provides changes lower than 6% in most cases for both SW and UVER simulations. The propagation of water vapor uncertainty causes variations in SW simulations less than 4% for solar zenith angles below 75º.
Different meteorological data series called multiyear data, long-term average measured data serie... more Different meteorological data series called multiyear data, long-term average measured data series, or test reference years (TRYs) are required for solar energy system simulation. It is known that the use of the multiyear data approach requires a great effort in time and computation, long-term average measured data do not have the extreme values of weather data given along the year,
Abstract- The estimation of hourly and daily solar radiation values on inclined surfaces starts w... more Abstract- The estimation of hourly and daily solar radiation values on inclined surfaces starts with the determination of the corresponding hourly values on the horizontal plane. To serve the latter purpose the Meteorological Radiation Model was developed. The goal of the model is to estimate solar radiation at places where there are not available measurements. This work presents a theoretical description of the code and gives comparison between meas urements and estimated values for Athens, Lisbon and a Japanese location.
... Meteor. 28:711–721. [Abstract]. Bilbao, J., A. de Miguel, JA Medina, and JJ López. 1997. ... ... more ... Meteor. 28:711–721. [Abstract]. Bilbao, J., A. de Miguel, JA Medina, and JJ López. 1997. ... Phys. Appl. 21:211–218. de Miguel, A., J. Bilbao, R. Aguiar, H. Kambezidis, and E. Negro. 2001. Diffuse solar irradiation model evaluation in the north Mediterranean belt area. Sol. ...
Maximum (Tmax), minimum (Tmin), mean (Tmean) air temperature and diurnal temperature range (DTR) ... more Maximum (Tmax), minimum (Tmin), mean (Tmean) air temperature and diurnal temperature range (DTR) trends on a seasonal and annual time scale are evaluated from data recorded at nine Spanish weather stations during the period 1950–2011. Temporal and spatial variability in temperatures and in the diurnal temperature range (DTR) are presented. The non-parametric Theil-Sen approach and the Mann-Kendall test are used to evaluate anomaly temperature trends and their statistical significance, respectively. An air temperature reduction in Spain between 1950 and 1980 emerges and significant warming is observed between 1980 and 2011. On a seasonal scale, the weakest trends (mostly insignificant at the 5% confidence level) are noted during autumn, while the strongest warming rates were found during summer and spring. The rate of change between 1950 and 2011 in Tmax, Tmin and Tmean was 1.6 °C, 1.1 °C and 1.3 °C, respectively. DTR trends showed a decrease on the Mediterranean coast and a small ch...
ABSTRACT In order to study the characteristics of solar direct radiation and the atmospheric turb... more ABSTRACT In order to study the characteristics of solar direct radiation and the atmospheric turbidity in Valladolid, Spain, global, diffuse and direct irradiance data were recorded from May 2010 to December 2011, with a frequency of 10 minute. Measurements used were taken by the Energy and Atmosphere Group (http://www3.uva.es/renova), University of Valladolid, Spain at the Solar Radiometric Station (41,81°N 4.93°W, 840m a.s.l.) located on the Atmosphere Researcher Centre, Villalba de los Alcores, Valladolid, Spain. Sensors were installed in a Sun tracker (Solys 2, Kipp & Zonen) that blocks direct solar radiation using a shadow ball. The system consists of two pyranometers CMP-21 and one pyrheliometer CHP-1 (Kipp & Zonen), respectively. Based on these measurements, the characteristics of direct solar irradiance data were evaluated in order to know the main statistical parameters of the distribution. Angström turbidity coefficient values, beta, were estimated from direct solar irradiance and clear sky conditions. The beta coefficient values were obtained from MODIS satellite instrument, and the aerosol optical depth values, AOD(550nm), were evaluated. The turbidity coefficient beta shows seasonal variation, with higher values in summer (< 0.15) and lower in winter (< 0.05). It could be due to high temperatures in summer and less rainy days which would induce more atmospheric turbidity, increasing vertical convection and particles enhancement. The scattered graph of aerosol optical depth from satellite and the obtained from Angström expression has been plotted. The slope presents a value around the unity, 0.96, and the correlation coefficient shows a value of 0.6 . It was observed that turbidity coefficients increased in April 2011, and in order to now the origin the change, air masses trajectories, deduced from HYSPLIT model (http://ready.arl.noaa.gov/HYSPLIT.php) were studied. From the results it has been obtained that a situation of low pressures in the Atlantic Portuguese coast and high pressure in the North of Spain induced the movement of dust from Sahara desert into the Iberian Peninsula.
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Papers by Argimiro Miguel