Preprints
https://doi.org/10.5194/amt-2021-172
https://doi.org/10.5194/amt-2021-172
17 Jun 2021
 | 17 Jun 2021
Status: this preprint was under review for the journal AMT but the revision was not accepted.

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

Ryan Thalman and Jaron C. Hansen

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.

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Ryan Thalman and Jaron C. Hansen

Status: closed

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

Status: closed

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.