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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 10 Sep 2018

Research article | 10 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

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

Nick Jordan1, Connie Z. Ye1, Satyaki Ghosh1, Rebecca A. Washenfelder2, Steven S. Brown2, and Hans D. Osthoff1 Nick Jordan et al.
  • 1Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
  • 2Earth System Research Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80303, USA

Abstract. A cavity-enhanced absorption spectrometer (CEAS) for quantification of atmospheric trace gases that absorb in the cyan region of the electromagnetic spectrum (470 to 540nm), including NO2 and I2, is described. The instrument uses a light-emitting diode coupled to a 1m 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 6.3km. 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 from 480 to 535nm. Under laboratory conditions, the 60s, 1σ measurement precisions were ±105 and ±38 pptv for NO2 and I2, respectively. The CEAS sampled ambient air in Ucluelet, BC, in July 2015. CEAS 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.

Nick Jordan et al.
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Status: final response (author comments only)
Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Nick Jordan et al.
Nick Jordan et al.
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Short summary
A new spectrometer to measure abundances of the atmospheric trace gases nitrogen dioxide and iodine is described. The spectrometer uses a diode emitting light between 470 and 540 nm and two highly reflective mirrors to yield an effective absorption path of 6.3 km. We re-measured scattering cross-sections of common atmospheric gases in the cyan region and present sample NO2 measurements that agreed with those made with a laser-based instrument.
A new spectrometer to measure abundances of the atmospheric trace gases nitrogen dioxide and...