Selective measurements of NO, NO<sub>2</sub> and NO<sub>y</sub> in the free troposphere using quantum cascade laser spectroscopy
Author:
Tuzson B.ORCID, Zeyer K., Steinbacher M.ORCID, McManus J. B., Nelson D. D., Zahniser M. S., Emmenegger L.ORCID
Abstract
Abstract. A quantum cascade laser based absorption spectrometer for continuous and direct measurements of NO and NO2 was employed at the high-altitude monitoring site Jungfraujoch (3580 m a.s.l., Switzerland) during a three month campaign in Spring/Summer 2012. The total reactive nitrogen, NOy, was also measured in the form of NO after conversion on a gold catalyst. The aim was to assess the suitability of the instrument for long-term monitoring of the main reactive nitrogen species under predominantly free tropospheric air conditions. A precision (1σ) of 10 and 3 ppt for NO and NO2 was achieved with 180 s averaging time under field conditions. The linear dynamic range of the instrument has been verified for both species from the detection limit to &approx;45 ppbv. The spectrometer shared a common sampling inlet with a chemiluminescence-based analyzer. The comparison of the time series shows excellent agreement between the two techniques and demonstrates the adequacy of the laser spectroscopic approach for this kind of demanding environmental applications.
Publisher
Copernicus GmbH
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