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Influence of variable weather on incident solar radiation and its spectral composition in the Ostrava region, Czech Republic
Opálková, M. ; Robson, T. M. ; Navrátil, M. ; Špunda, Vladimír
Incident solar radiation is influenced by many factors, including distance from the equator, altitude, time of year, and season. Absorption of radiation and its scattering are connected with the properties of atmospheric compounds. Cloud cover and air pollution are connected with tropospheric properties. Using our data, the influence of weather changes on the dose of solar irradiance reaching the Earth’s surface and its spectral composition are described. Solar radiation components were measured continuously by a system of sensors situated in the Botanical Garden of the University of Ostrava, Czech Republic. Data for 2014 were chosen for analyses. Days were divided into categories of sunny days and cloudy days according to weather conditions and daily radiation patterns. Percent differences in received solar radiation between sunny and cloudy days were calculated for eight months (Jan, Feb, Mar, Jun, Jul, Aug, Sep, and Dec). Differences in received solar radiation between clean and polluted days were calculated for sunny and cloudy days in December 2014. Mean incident solar radiation during cloudy days was reduced by 61% from the value for sunny days (in summer months) and by 64% from the value for sunny days in winter months. The largest influence of clouds on received solar radiation was during September and the smallest was during June. There was a reduction in incident solar radiation caused by the atmospheric pollutant PM10 during winter months. This reduction amounted to 10% during sunny days and 21% during cloudy days for December 2014. Clouds significantly reduced incident solar radiation as did the air pollutant PM10, but there were probably other factors also contributing to the reduction in incident solar radiation.
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