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Day and night-time formation of organic nitrates at a forested mountain site in south-west Germany

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Sobanski,  N.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101313

Thieser,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons203248

Schuladen,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons140364

Sauvage,  C.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101279

Song,  W.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101364

Williams,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons101104

Lelieveld,  J.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

/persons/resource/persons100898

Crowley,  J. N.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Sobanski, N., Thieser, J., Schuladen, J., Sauvage, C., Song, W., Williams, J., et al. (2016). Day and night-time formation of organic nitrates at a forested mountain site in south-west Germany. Atmospheric Chemistry and Physics Discussions, 16.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-EF36-D
Abstract
We report in situ measurements of total peroxy nitrates (6PNs) and total alkyl nitrates (6 ANs) in a forested–urban location at the top of the Kleiner Feldberg mountain in south-west Germany. The data, obtained using thermal dissociation cavity ring-down spectroscopy (TD-CRDS) in August–September 2011 (PARADE campaign) and July 2015 (NOTOMO campaign), represent the first detailed study of 6 PNs and 6 ANs over continental Europe. We find that a significant fraction of NOx (up to 75 %) is sequestered as organics nitrates at this site. Furthermore, we also show that the night-time production of alkyl nitrates by reaction of NO3 with biogenic hydrocarbons is comparable to that from daytime OH-initiated oxidation pathways. The 6 ANs / ozone ratio obtained during PARADE was used to derive an approximate average yield of organic nitrates at noon from the OH initiated oxidation of volatile organic compounds (VOCs) of ∼7 % at this site in 2011, which is comparable with that obtained from an analysis of VOCs measured during the campaign. A much lower AN yield, < 2 %, was observed in 2015, which may result from sampling air with different average air mass ages and thus different degrees of breakdown of assumptions used to derive the branching ratio, but it may also reflect a seasonal change in the VOC mixture at the site.