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  A two-channel, thermal dissociation cavity-ringdown spectrometer for the detection of ambient NO2, RO2NO2 and RONO2

Thieser, J., Schuster, G., Phillips, G. J., Reiffs, A., Parchatka, U., Pöhler, D., et al. (2015). A two-channel, thermal dissociation cavity-ringdown spectrometer for the detection of ambient NO2, RO2NO2 and RONO2. Atmospheric Measurement Techniques Discussions, 8, 11533-11596. doi:10.5194/amtd-8-11533-2015.

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 Creators:
Thieser, J.1, Author              
Schuster, G.1, Author              
Phillips, G. J.1, Author              
Reiffs, Andreas1, Author              
Parchatka, U.1, Author              
Pöhler, D., Author
Lelieveld, J.1, Author              
Crowley, J. N.1, Author              
Affiliations:
1Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826285              

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 Abstract: We describe a Thermal Dissociation Cavity-Ring-Down Spectrometer (TD-CRDS) for measurement of ambient NO2, total peroxy nitrates (ŒPNs) and total alkyl nitrates (ŒANs). The spectrometer has two separate cavities operating at 405.2 and 408.5 nm, one cavity (reference) samples NO2 continuously from an inlet at ambient 5 temperature, the other samples sequentially from an inlet at 473 K in which PNs areconverted to NO2 or from an inlet at 723 K in which both PNs and ANs are converted to NO2, dierence signals being used to derive mixing ratios of ŒPNs andŒANs. We describe an extensive set of laboratory experiments and numerical simulations to characterise the fate of organic radicals in the hot inlets and cavity and derive correction 10 factors to account for the bias resulting from interaction of peroxy radicals with ambient NO and NO2 . Finally, we present the first measurements and comparison with other instruments during a field campaign, outline the limitations of the present instrument and provide an outlook for future improvements.

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 Dates: 2015-11-03
 Publication Status: Published online
 Pages: 63
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.5194/amtd-8-11533-2015
 Degree: -

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Title: Atmospheric Measurement Techniques Discussions
  Other : Atmos. Meas. Tech. Discuss.
  Abbreviation : AMTD
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau : Copernicus
Pages: - Volume / Issue: 8 Sequence Number: - Start / End Page: 11533 - 11596 Identifier: Other: 1867-8610
CoNE: https://pure.mpg.de/cone/journals/resource/1867-8610