Articles | Volume 13, issue 5
https://doi.org/10.5194/amt-13-2161-2020
https://doi.org/10.5194/amt-13-2161-2020
Research article
 | 
05 May 2020
Research article |  | 05 May 2020

The influence of the baseline drift on the resulting extinction values of a cavity attenuated phase shift-based extinction monitor (CAPS PMex)

Sascha Pfeifer, Thomas Müller, Andrew Freedman, and Alfred Wiedensohler

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Latest update: 20 May 2024
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Short summary
The effect of the baseline drift on the resulting extinction values of three CAPS PMex monitors with different wavelengths was analysed for an urban background station. A significant baseline drift was observed, which leads to characteristic measurement artefacts for particle extinction. Two alternative methods for recalculating the baseline are shown. With these methods the extinction artefacts are diminished and the effective scattering of the resulting extinction values is reduced.