Preprints
https://doi.org/10.5194/amt-2021-172
https://doi.org/10.5194/amt-2021-172

  17 Jun 2021

17 Jun 2021

Review status: this preprint is currently under review for the journal AMT.

Detection of Sulfur Dioxide by Broadband Cavity Enhanced Absorption Spectroscopy (BBCEAS)

Ryan Thalman1 and Jaron C. Hansen2 Ryan Thalman and Jaron C. Hansen
  • 1Department of Chemistry, Snow College, Richfield, UT, USA
  • 2Department of Chemistry and Biochemistry, Brigham Young, University, Provo, UT, USA

Abstract. Sulfur dioxide (SO2) is an important precursor for formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broad Band Cavity Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a minimum limit of detection of 0.6 ppbv using the spectral range 305.5–312 nm and an averaging time of 60 seconds. The instrument consists of high reflectivity mirrors (0.9984 at 310 nm) and a deep UV light source. The effective absorption path length of the instrument is 610 m in a 0.957 m base length. Published reference absorption cross-sections were used to fit and retrieve the SO2 concentrations and were compared to a diluted standard for SO2. The comparison was well correlated, R2 = 0.9985 with a correlation slope of 1.01.

Ryan Thalman and Jaron C. Hansen

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2021-172', Anonymous Referee #1, 06 Jul 2021
    • AC1: 'Reply on RC1', Jaron Hansen, 20 Oct 2021
  • RC2: 'Comment on amt-2021-172', Anonymous Referee #2, 14 Jul 2021
    • AC2: 'Reply on RC2', Jaron Hansen, 20 Oct 2021
  • RC3: 'Comment on amt-2021-172', Anonymous Referee #3, 15 Jul 2021
    • AC3: 'Reply on RC3', Jaron Hansen, 20 Oct 2021

Ryan Thalman and Jaron C. Hansen

Ryan Thalman and Jaron C. Hansen

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Short summary
Sulfur dioxide (SO2) is an important gas precursor for formation of atmospheric sulfate aerosol and acid rain. SO2 has direct human health effects through the respiratory system. A new instrument using Broad Band Cavity Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a minimum limit of detection of 0.6 ppbv has been fabricated. The instrument provides a new technique for the measurement of SO2 over a wide range of atmospherically relevant concentrations.