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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-435
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-435
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Nov 2020

09 Nov 2020

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This preprint is currently under review for the journal AMT.

Improvements to a laser-induced fluorescence instrument for measuring SO2: impact on accuracy and precision

Pamela S. Rickly1,2, Lu Xu3, John D. Crounse3, Paul O. Wennberg3,4, and Andrew W. Rollins2 Pamela S. Rickly et al.
  • 1Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA
  • 2Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, USA
  • 3Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA
  • 4Division of Engineering and Applied Science, California Institute of Technology, Pasadena, CA 91125, USA

Abstract. This work describes improvements made to the in-situ laser induced fluorescence SO2 instrument as originally described in Rollins et al. (2016). We report measurements of the SO2 fluorescence emission spectrum. These measurements allow for the determination of the most appropriate bandpass filters to optimize the fluorescence signal while reducing the instrumental background. Because many aromatic species fluoresce in the same spectral region as SO2, fluorescence spectra were also measured for naphthalene and anisole to determine if ambient SO2 measurements may be biased in the presence of such species. In addition, the 216.9 nm laser linewidth was decreased in order to increase the online/offline signal ratio which in-turn increases the precision of the measurement. The effects of these improvements on the instrumental sensitivity were determined by analyzing the signal and background of the instrument using varying optical bandpass filter ranges and cell pressures and calculating the resulting limit of detection. As a result, we report an improvement to the instrumental sensitivity by as much as 50 %.

Pamela S. Rickly et al.

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Pamela S. Rickly et al.

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