A broadband cavity-enhanced spectrometer for atmospheric trace gas measurements and Rayleigh scattering cross sections in the cyan region (470–540 nm)

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dc.contributor.authorJordan, Nick
dc.contributor.authorYe, Connie Z.
dc.contributor.authorGhosh, Satyaki
dc.contributor.authorWashenfelder, Rebecca A.
dc.contributor.authorBrown, Steven S.
dc.contributor.authorOsthoff, Hans D.
dc.date.accessioned2021-06-23T16:35:53Z
dc.date.available2021-06-23T16:35:53Z
dc.date.issued2019-02-27
dc.description.abstractAn incoherent broadband cavity-enhanced absorption spectroscopy (IBBCEAS) instrument for quantification of atmospheric trace gases that absorb in the cyan region of the electromagnetic spectrum (470 to 540 nm), including NO2 and I2, is described. The instrument uses a light-emitting diode coupled to a 1 m optical cavity consisting of a pair of mirrors in stable resonator configuration. Transmitted light is monitored using a grating spectrometer and charge-coupled device array detector. The average mirror reflectivity was determined from the N2∕He and Ar∕He ratios of scattering coefficients and was ∼99.98 % at its maximum, yielding an effective optical path length of 6.3 km. Cross sections of N2, O2, air, Ar, CO2, and CH4 scattering and of O4 absorption were measured and agree with literature values within the measurement uncertainty. Trace gas mixing ratios were retrieved using the spectral fitting software DOASIS (DOAS intelligent system) from 480 to 535 nm. Under laboratory conditions, the 60 s, 1σ measurement precisions were ±124 and ±44 pptv for NO2 and I2, respectively. The IBBCEAS instrument sampled ambient air in Ucluelet, BC, Canada, in July 2015. IBBCEAS retrievals agreed with independent measurements of NO2 by blue diode laser cavity ring-down spectroscopy (r2=0.975), but ambient I2 concentrations were below the detection limit.en_US
dc.description.grantingagencyNatural Sciences and Engineering Research Council (NSERC)en_US
dc.identifier.citationJordan, N., Ye, C. Z., Ghosh, S., Washenfelder, R. A., Brown, S. S., & Osthoff, H. D. (2019). A broadband cavity-enhanced spectrometer for atmospheric trace gas measurements and Rayleigh scattering cross sections in the cyan region (470–540 nm). Atmospheric Measurement Techniques, 12(2), 1277–1293. doi:10.5194/amt-12-1277-2019en_US
dc.identifier.doihttp://dx.doi.org/10.5194/amt-12-1277-2019en_US
dc.identifier.grantnumberRGPIN/03849-2016en_US
dc.identifier.urihttp://hdl.handle.net/1880/113529
dc.language.isoengen_US
dc.publisherEuropean Geosciences Unionen_US
dc.publisher.departmentChemistryen_US
dc.publisher.facultyScienceen_US
dc.publisher.hasversionpublishedVersionen_US
dc.publisher.institutionUniversity of Calgaryen_US
dc.rights© Author(s) 2019.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0en_US
dc.subjectCavity-enhanced absorption spectroscopyen_US
dc.subjectcyanen_US
dc.subjectNO2en_US
dc.subjectI2en_US
dc.titleA broadband cavity-enhanced spectrometer for atmospheric trace gas measurements and Rayleigh scattering cross sections in the cyan region (470–540 nm)en_US
dc.typejournal articleen_US
ucalgary.item.requestcopytrueen_US
ucalgary.scholar.levelFacultyen_US
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