Aerosol-radiation feedback loop based on satellite data

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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 Khansari, Marzieh 2018
dc.identifier.uri URN:NBN:fi-fe201804208680
dc.description.abstract The climate feedback is a response of the climate system to a perturbation through a number of mechanisms. Perturbations can be due to natural factors, like volcanic activity or changes in solar activity, or anthropogenic such as emissions of long-lived greenhouse gases and aerosol particles. Atmospheric aerosols affect the Earth’s radiation budget. The aerosols impact radiation directly by scattering and absorbing incoming solar radiation and indirectly by changing cloud properties via formation of cloud condensation nuclei. Here, the aerosol radiation feedback loop associated to the continental biosphere-aerosol-cloud-climate (COBACC) feedback loop, is suggested. This negative feedback loop connects increasing atmospheric CO2 concentration, rising temperatures, the formation of aerosol particles due to the emission of biogenic volatile organic compounds, changes in ratio of diffuse to global radiation in the clear sky condition, and changes in the plant gross primary production. In this study, in-situ atmospheric measurement data in Hyytiälä station, as well as satellite atmospheric measurement data (CERES (Clouds and the Earth’s Radiant Energy System) and MODIS (Moderate Resolution Imaging Spectroradiometer instrument)) around Hyytiälä station and a small area in the western plain of Siberia for clear sky conditions in June and July around noon, were used. Three methods for detecting clear-sky conditions were considered: brightness parameter, global radiation smoothing and lastly MODIS cloud mask method. Here, MODIS cloud mask method was selected as the most suitable method due to availability of data and global coverage. This study proved partly the existence of the aerosol radiation feedback loop by finding positive correlation between some of the components of the feedback loop, such as condensation sink(CS) and temperature, ratio of diffuse radiation to global radiation (R) and CS, and R and temperature. Additionally, it was shown that satellite-based data compares well with in-situ data. Hence, it is possible to use satellite-based data for the aerosol-radiation feedback loop. In addition, the impact of relative humidity on the relation between R and temperature was investigated. It was found that it is important to take into account the swelling effect in order to investigate the relation between R and temperature. In contrast, solar zenith angle does not have an impact on the relation during study period (June – July). en
dc.language.iso eng
dc.publisher Helsingin yliopisto fi
dc.publisher University of Helsinki en
dc.publisher Helsingfors universitet sv
dc.title Aerosol-radiation feedback loop based on satellite data en
dc.type.ontasot pro gradu -tutkielmat fi
dc.type.ontasot master's thesis en
dc.type.ontasot pro gradu-avhandlingar sv
dct.identifier.urn URN:NBN:fi-fe201804208680

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