The Evolution of Lighting in South-West India from Night-Time Lights: 2012–2020

Day- and Night-time Formation of Organic Nitrates at a Forested Mountain-site in South West Germany

10.5194/acp-2016-874 ◽

2016 ◽

Cited By ~ 1

Author(s):

Nicolas Sobanski ◽

Jim Thieser ◽

Jan Schuladen ◽

Carina Sauvage ◽

Wei Song ◽

...

Keyword(s):

Thermal Dissociation ◽

West Germany ◽

Organic Nitrates ◽

Lower Yield ◽

Night Time ◽

Alkyl Nitrates ◽

South West ◽

Peroxy Nitrates ◽

Kleiner Feldberg

Abstract. We report in-situ measurement of total peroxy-nitrates (ƩPNs) and total alkyl nitrates (ƩANs) 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–August 2015 (NOTOMO campaign), represent the first detailed study of ƩPNs and ƩANs over continental Europe. We find that a significant fraction of NOx (up to 75 %) is sequestered as organics nitrates at this site. Futher, we also show that the night-time production of alkyl nitrates by reaction of NO3 with biogenic hydrocarbons is comparable to that from day-time, OH-initiated oxidation pathways. The ƩANs-to-ozone ratio obtained during PARADE was used to derive an approximate, average yield of organic nitrates at noon time from the OH initiated oxidation of VOCs of 7 % at this site in 2011, which is comparable with that obtained from an analysis of VOCs at the site. A much lower yield,

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

Atmospheric Chemistry and Physics ◽

10.5194/acp-17-4115-2017 ◽

2017 ◽

Vol 17 (6) ◽

pp. 4115-4130 ◽

Cited By ~ 13

Author(s):

Nicolas Sobanski ◽

Jim Thieser ◽

Jan Schuladen ◽

Carina Sauvage ◽

Wei Song ◽

...

Keyword(s):

Thermal Dissociation ◽

Branching Ratio ◽

West Germany ◽

Organic Nitrates ◽

Night Time ◽

Alkyl Nitrates ◽

South West ◽

Peroxy Nitrates ◽

Kleiner Feldberg

Abstract. We report in situ measurements of total peroxy nitrates (ΣPNs) and total alkyl nitrates (ΣANs) 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 ΣPNs and ΣANs 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 ΣANs ∕ 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.

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