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

Show full item record



Permalink

http://urn.fi/URN:NBN:fi-fe201804208682
Title: Analysis of different radiation parameters and their comparison to cloud occurrence at the SMEAR II station
Author: Sillanpää, Salla
Contributor: University of Helsinki, Faculty of Science, Department of Physics
Publisher: Helsingin yliopisto
Date: 2018
Language: eng
URI: http://urn.fi/URN:NBN:fi-fe201804208682
http://hdl.handle.net/10138/273613
Thesis level: master's thesis
Discipline: Meteorology
Meteorologia
Meteorologi
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.


Files in this item

Total number of downloads: Loading...

Files Size Format View
Sillanpaa_Salla_Pro_Gradu_2018.pdf 12.82Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record