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

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http://urn.fi/URN:NBN:fi-fe201804208682
Julkaisun nimi: Analysis of different radiation parameters and their comparison to cloud occurrence at the SMEAR II station
Tekijä: Sillanpää, Salla
Muu tekijä: Helsingin yliopisto, Matemaattis-luonnontieteellinen tiedekunta, Fysiikan laitos
Julkaisija: Helsingin yliopisto
Päiväys: 2018
Kieli: eng
URI: http://urn.fi/URN:NBN:fi-fe201804208682
http://hdl.handle.net/10138/273613
Opinnäytteen taso: pro gradu -tutkielmat
Oppiaine: Meteorology
Meteorologia
Meteorologi
Tiivistelmä: 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.


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