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    Replacing the AMOR with the miniDOAS in the ammonia monitoring network in the Netherlands

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    Authors
    Berkhout, Augustinus J. C.
    Swart, Daan
    Volten, Hester
    Gast, Lou F. L.
    Haaima, Marty
    Verboom, Hans
    Stefess, Guus
    Hafkenscheid, Theo
    Hoogerbrugge, Ronald
    Type
    Article
    Language
    en
    
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    Title
    Replacing the AMOR with the miniDOAS in the ammonia monitoring network in the Netherlands
    Published in
    Atmos Meas Tech 2017; 10:4099-120
    Publiekssamenvatting
    In this paper we present the continued development of the miniDOAS, an active differential optical absorption spectroscopy (DOAS) instrument used to measure ammonia concentrations in ambient air. The miniDOAS has been adapted for use in the Dutch National Air Quality Monitoring Network. The miniDOAS replaces the life-expired continuous-flow denuder ammonia monitor (AMOR). From September 2014 to December 2015, both instruments measured in parallel before the change from AMOR to miniDOAS was made. The instruments were deployed at six monitoring stations throughout the Netherlands. We report on the results of this intercomparison.

    Both instruments show a good uptime of ca. 90 %, adequate for an automatic monitoring network. Although both instruments produce 1 min values of ammonia concentrations, a direct comparison on short timescales such as minutes or hours does not give meaningful results because the AMOR response to changing ammonia concentrations is slow. Comparisons between daily and monthly values show good agreement. For monthly averages, we find a small average offset of 0.65 ± 0.28 µg m−3 and a slope of 1.034 ± 0.028, with the miniDOAS measuring slightly higher than the AMOR. The fast time resolution of the miniDOAS makes the instrument suitable not only for monitoring but also for process studies.
    DOI
    10.5194/amt-10-4099-2017
    URI
    http://hdl.handle.net/10029/621589
    ae974a485f413a2113503eed53cd6c53
    10.5194/amt-10-4099-2017
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