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    Effective Ultraviolet radiation in the Netherlands

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    Authors
    Slaper H
    Reinen HAJM
    Bordewijk JA
    Schlamann E
    Type
    Report
    Language
    en
    
    Metadata
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    Title
    Effective Ultraviolet radiation in the Netherlands
    Translated Title
    Effectieve UV-straling in Nederland
    Publiekssamenvatting
    In dit rapport worden de meetresultaten en eerste analyses van de spectrale UV-metingen gepresenteerd, zoals die zijn verkregen met de bij het RIVM ontwikkelde spectrale UV-meetsysteem, dat sedert april 1993 operationeel is. De spectrale meetgegevens zijn in dit rapport geanalyseerd met betrekking tot effecten van variaties van de dikte van de ozonlaag, bewolking en aerosolen. Metingen zijn vergeleken met modelberekeningen van de UV-transfer voor onbewolkte situaties en een empirische methode is ontwikkeld en toegepast voor de analyse van de invloeden van bewolking en aerosolen. Bewolking en aerosolen reduceren de effectieve UV jaardosis met circa 35%. De methoden zijn gebruikt voor het berekenen van de effectieve UV jaardoses in de periode van 1991-1994. De resultaten zijn vergeleken met een referentie jaarsom, gebaseerd op gemiddelde ozonwaarden in de periode van 1972-1993 en een gemiddelde reductie door bewolking en aerosolen. Vergeleken met de referentie jaarsom is de voor bewolking en aerosolen gecorrigeerde berekende jaardosis in 1991 3% lager, de jaardosis in 1992 5% hoger en in 1993 12% hoger. De voor bewolking en aerosolen gecorrigeerde jaardosis in 1994 was ruim 8% hoger dan de referentie jaarsom, hetgeen inhoudt dat de sterke opwaartse trend van 1992 en 1993, die mogelijk is beinvloed door de vulkaanuitbarsting van de Pinatubo in 1991, niet wordt voortgezet. Niettemin is de jaardosis in 1994 beduidend hoger dan de jaardosis in 1991 en de referentie dosis.<br>
    This report presents the observations and first analysis of the spectral and effective UV-irradiance levels in the Netherlands (at 52o N) obtained with the UV-monitoring system developed at RIVM and operational since April 1993. The spectral data have been analysed with respect to effects of variations of thickness of the ozone layer, cloud cover and aerosols. Measurements were compared with UV-transfer model calculations for cloudless situations. An empirical method is developed and applied for the evaluation of cloud and aerosol effects on atmospheric UV-transfer. Clouds and aerosols were found to reduce the yearly effective UV dose by 35% compared to clear sky estimates. The method is used to analyse yearly effective UV doses in the Netherlands in the period 1991-1994. The results are compared to a reference yearly UV dose, based on average ozone values over 1972-1993, and average cloud and aerosol reductions. Compared to the reference yearly dose the cloud and aerosol corrected yearly doses in 1991 were 3% lower, the doses in 1992 5% higher, and in 1993 12% higher. The cloud and aerosol corrected yearly dose for 1994 was 8% higher than the reference yeardose. Thus the sharp upward trend observed in 1992 and 1993, which might have been influenced by the volcanic eruption of the Pinatubo in 1991, has not been continued. Nevertheless, the 1994 estimates are consistently higher than the 1991 values and the reference dose.<br>
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
    Sponsors
    DGM/SVS/SNV
    URI
    http://hdl.handle.net/10029/259636
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    RIVM official reports

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