Analysis of different radiation parameters and their comparison to cloud occurrence at the SMEAR II station

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dc.contributor Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Fysiikan laitos fi
dc.contributor University of Helsinki, Faculty of Science, Department of Physics en
dc.contributor Helsingfors universitet, Matematisk-naturvetenskapliga fakulteten, Institutionen för fysik sv Sillanpää, Salla 2018
dc.identifier.uri URN:NBN:fi-fe201804208682
dc.description.abstract This study is an analysis of the different radiation parameters measured at SMEAR II station in Hyytiälä, Finland. The measurements include global radiation, diffuse shortwave radiation, reflected shortwave radiation, net radiation, photosynthetically active radiation (PAR), diffuse PAR, reflected PAR, ultraviolet-A (UV-A), ultraviolet-B (UV-B) radiation, incoming and outgoing infrared (IR) radiation and PAR below canopy measurements. Annual and inter-annual variations in different radiation parameters are investigated alongside dependencies and changes in relationships between different radiation variables. The changes in the different radiation parameters are compared to changes in the cloud occurrence at the measurement station. The cloud occurrence is based on cloud base height measurements from a ceilometer. The monthly median values of the parameters and ratios of parameters investigated in this study did not show any statistically significant trends. Annual and seasonal variation were detected for both individual parameters and ratios of parameters. These variations result from the changes in solar zenith angle, climatic conditions, cloudiness, aerosol load of the atmosphere and surface absorbance/emittance properties. en
dc.language.iso eng
dc.publisher Helsingin yliopisto fi
dc.publisher University of Helsinki en
dc.publisher Helsingfors universitet sv
dc.title Analysis of different radiation parameters and their comparison to cloud occurrence at the SMEAR II station en
dc.type.ontasot pro gradu -tutkielmat fi
dc.type.ontasot master's thesis en
dc.type.ontasot pro gradu-avhandlingar sv
dc.subject.discipline Meteorology en
dc.subject.discipline Meteorologia fi
dc.subject.discipline Meteorologi sv
dct.identifier.urn URN:NBN:fi-fe201804208682

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