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Issue 5, 2006
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An improved dual channel PERCA instrument for atmospheric measurements of peroxy radicals

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Abstract

This paper describes a new dual-channel PEroxy RadiCal Amplification (PERCA) instrument, which has been designed to improve the time resolution and signal to noise and to reduce the interference caused by variations in ambient ozone concentrations. The instrument was run at the Weybourne Atmospheric Observatory (WAO), North Norfolk, during WAOWEX (Weybourne Atmospheric Observatory Winter Experiment) in January/February 2002 and INSPECTRO (Influence of clouds on the spectral actinic flux in the lower troposphere) in September 2002. The performance of the instrument is assessed and compared to that of a single channel instrument. In particular, it is shown how the precision is greatly improved in fluctuating background ozone conditions. In addition the improved time response of the instrument allows changes in peroxy radical concentrations to be related to rapid changes in nitric oxide concentrations and the ozone photolysis frequency, j(O1D).

Graphical abstract: An improved dual channel PERCA instrument for atmospheric measurements of peroxy radicals

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Publication details

The article was received on 14 Oct 2005, accepted on 06 Apr 2006 and first published on 21 Apr 2006


Article type: Paper
DOI: 10.1039/B514630E
Citation: J. Environ. Monit., 2006,8, 530-536

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    An improved dual channel PERCA instrument for atmospheric measurements of peroxy radicals

    T. J. Green, C. E. Reeves, Z. L. Fleming, N. Brough, A. R. Rickard, B. J. Bandy, P. S. Monks and S. A. Penkett, J. Environ. Monit., 2006, 8, 530
    DOI: 10.1039/B514630E

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