Quantification of nitrous acid (HONO) and nitrogen dioxide (NO2) in ambient air by broadband cavity-enhanced absorptionspectroscopy (IBBCEAS) between 361 and 388 nm

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dc.contributor.authorJordan, Nick
dc.contributor.authorOsthoff, Hans D.
dc.date.accessioned2021-06-23T16:24:34Z
dc.date.available2021-06-23T16:24:34Z
dc.date.issued2020-01-23
dc.description.abstractThis work describes an incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) instrument for quantification of HONO and NO2 mixing ratios in ambient air. The instrument is operated in the near-ultraviolet spectral region between 361 and 388 nm. The mirror reflectivity and optical cavity transmission function were determined from the optical extinction observed when sampling air and helium. To verify the accuracy of this approach, Rayleigh scattering cross sections of nitrogen and argon were measured and found to be in quantitative agreement with literature values. The mirror reflectivity exceeded 99.98 %, at its maximum near 373 nm, resulting in an absorption path length of 6 km from a 1 m long optical cavity. The instrument precision was assessed through Allan variance analyses and showed minimum deviations of ±58 and ±210 pptv (1σ) for HONO and NO2, respectively, at an optimum acquisition time of 5 min. Measurements of HONO and NO2 mixing ratios in laboratory-generated mixtures by IBBCEAS were compared to thermal dissociation cavity ring-down spectroscopy (TD-CRDS) data and agreed within combined experimental uncertainties. Sample ambient air data collected in Calgary are presented.en_US
dc.description.grantingagencyNatural Sciences and Engineering Research Council (NSERC)en_US
dc.identifier.citationJordan, N., & Osthoff, H. D. (2020). Quantification of nitrous acid (HONO) and nitrogen dioxide (NO2) in ambient air by broadband cavity-enhanced absorption spectroscopy (IBBCEAS) between 361 and 388 nm. Atmospheric Measurement Techniques, 13(1), 273–285. doi:10.5194/amt-13-273-2020en_US
dc.identifier.doihttp://dx.doi.org/10.5194/amt-13-273-2020en_US
dc.identifier.grantnumberRGPIN/03849-2016en_US
dc.identifier.urihttp://hdl.handle.net/1880/113528
dc.language.isoengen_US
dc.publisher.departmentChemistryen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionpublishedVersionen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.rights© Author(s) 2020.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.subjectCavity-enhanced absorptionspectroscopyen_US
dc.subjectHONOen_US
dc.subjectNO2en_US
dc.titleQuantification of nitrous acid (HONO) and nitrogen dioxide (NO2) in ambient air by broadband cavity-enhanced absorptionspectroscopy (IBBCEAS) between 361 and 388 nmen_US
dc.typejournal articleen_US
ucalgary.item.requestcopytrueen_US
ucalgary.scholar.levelFacultyen_US
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