Out-of-Range Stray Light Characterization of Single-Monochromator Brewer Spectrophotometers

T. Pulli, T. Karppinen, S. Nevas, P. Kärhä, K. Lakkala, J. M. Karhu, M. Sildoja, A. Vaskuri, Maksim Shpak, F. Manoocheri, L. Doppler, S. Gross, J. Mes, Erkki Ikonen

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    Abstract

    Stray light in single-monochromator Brewer instruments increases the uncertainty of solar ultraviolet spectral irradiance measurements and ozone retrievals. To study how spectral irradiance within and outside the measurement ranges of the instruments affects stray light, two Brewer MKII instruments were characterized for the level of in- and out-of-range stray light at multiple laser wavelengths. In addition, several solar-blind filters utilized in single-monochromator Brewers to limit out-of-range stray light were characterized for spectral and spatial transmittances. Finally, the measurement results were used to simulate the effect of stray light and stray light correction on spectral irradiance and ozone measurements at different wavelength regions. The effect of stray light from wavelengths above 340 nm was found to be negligible compared with other sources of uncertainty. On the other hand, contributions from wavelengths between 325 and 340 nm can form a significant portion of the overall stray light of the instrument, with 325 nm being the upper limit of the nominal measurement range of the instrument.

    Original languageEnglish
    Pages (from-to)1-11
    Number of pages11
    JournalAtmosphere-Ocean
    Volume56
    Issue number1
    DOIs
    Publication statusPublished - 2018
    MoE publication typeA1 Journal article-refereed

    Funding

    The work leading to this study was partly funded by the European Metrology Research Programme (EMRP) Project ENV59 ATMOZ “Traceability for atmospheric total column ozone.” The EMRP is jointly funded by EMRP participating countries within EURAMET and the European Union. T.P. and A.V. would also like to acknowledge the funded position of Aalto ELEC doctoral school.

    Keywords

    • measurements
    • ozone
    • solar UV
    • stray light

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