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    Twenty-five years of spectral UV-B measurements over Canada, Europe and Japan: Trends and effects from changes in ozone, aerosols, clouds, and surface reflectivity

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    Authors
    Fountoulakis, Ilias
    Zerefos, Christos S.
    Bais, Alkiviadis F.
    Kapsomenakis, John
    Koukouli, Maria-Elissavet
    Ohkawara, Nozomu
    Fioletov, Vitali
    De Backer, Hugo
    Lakkala, Kaisa
    Karppinen, Tomi
    Webb, Ann R.
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    Discipline
    Physical sciences
    Subject
    Solar UV radiation
    Total ozone
    Clouds
    Surface reflectivity
    UV-B
    Audience
    Scientific
    Date
    2018-11-01
    Publisher
    Elsevier
    Metadata
    Show full item record
    Description
    Spectral UV records of solar irradiance at stations over Europe, Canada, and Japan were used to study long-term trends at 307.5 nm for a 25-year period, from 1992 to 2016. Ground-based measurements of total ozone, as well as satellite measurements of the Aerosol Index, the Total Cloud Cover and the surface reflectivity were also used in order to attribute the estimated changes of the UV to the corresponding changes of these factors. The present study shows that over the Northern Hemisphere, the long-term changes in UV-B radiation reaching the Earth’s surface vary significantly over different locations, and that the main drivers of these variations are changes in aerosols and total ozone. At high latitudes, part of the observed changes may also be attributed to changes in the surface reflectivity. Over Japan, the UV-B irradiance at 307.5 nm has increased significantly by 3%/decade during the past 25 years, possibly due to the corresponding significant decrease of its absorption by aerosols. It was found that the greatest part of this increase took place before the mid-2000s. The only European station, over which UV radiation increases significantly, is that of Thessaloniki, Greece. Analysis of the clear-sky irradiance for the particular station shows increasing irradiance at 307.5 nm by 3.5%/decade during the entire period of study, with an increasing rate of change during the last decade, possibly again due to the decreasing absorption by aerosols.
    Citation
    Fountoulakis, Ilias; Zerefos, Christos S.; Bais, Alkiviadis F.; Kapsomenakis, John; Koukouli, Maria-Elissavet; Ohkawara, Nozomu; Fioletov, Vitali; De Backer, Hugo; Lakkala, Kaisa; Karppinen, Tomi; Webb, Ann R. (2018-11-01). Twenty-five years of spectral UV-B measurements over Canada, Europe and Japan: Trends and effects from changes in ozone, aerosols, clouds, and surface reflectivity. (Elsevier, Ed.), Comptes Rendus Geoscience, Vol. 350 (2018), 393-402, Elsevier.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7280
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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