Mixing Ratios and Photostationary State of NO and NO2 Observed During the POPCORN Field Campaign at a Rural Site in Germany

Rohrer, Franz; Brüning, D.; Grobler, Ellen S.; Weber, Mark; Ehhalt, D. H.; Neubert, R. E. M.; Schüßler, W.; Levin, Ingeborg

doi:10.1007/978-94-017-0813-5_6

Cited by 16 publications

(22 citation statements)

References 23 publications

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“…Chemiluminescence analyzer: NO, NO 2 , and O 3 mixing ratios were measured with a chemiluminescence analyzer (Eco Physics, CLD 780TR) [47]. NO was detected after reaction with an excess of O 3 , and the sum of NO and NO 2 is detected after photolytic conversion of NO 2 to NO (Eco Physics PLC760).…”

Section: Instrumentation At Saphirmentioning

confidence: 99%

Long optical cavities for open-path monitoring of atmospheric trace gases and aerosol extinction

et al. 2009

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Type of publicationArticle (peer-reviewed) An incoherent broadband cavity-enhanced absorption spectroscopy setup employing a 20 m long optical cavity is described for sensitive in situ measurements of light extinction between 630 and 690 nm. The setup was installed at the SAPHIR atmospheric simulation chamber during an intercomparison of instruments for nitrate (NO 3 ) radical detection. The long cavity was stable for the entire duration of the two week campaign. A detection limit of ∼2 pptv for NO 3 in an acquisition time of 5 s was established during that time. In addition to monitoring NO 3 , nitrogen dioxide (NO 2 ) concentrations were simultaneously retrieved and compared against concurrent measurements by a chemiluminescence detector. Some results from the campaign are presented to demonstrate the performance of the instrument in an atmosphere containing water vapor and inorganic aerosol. The spectral analysis of NO 3 and NO 2 , the concentration dependence of the water absorption cross sections, and the retrieval of aerosol extinction are discussed. The first deployment of the setup in the field is also briefly described.

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Section: Instrumentation At Saphirmentioning

confidence: 99%

Long optical cavities for open-path monitoring of atmospheric trace gases and aerosol extinction

et al. 2009

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“…The NO x data were analysed as described by Rohrer et al (1998). For a time resolution of 90 s the detection limits were 5 and 10 pptV and the accuracies 5 and 10% for NO and NO 2 , respectively.…”

Section: Instrumentationmentioning

confidence: 99%

Characterisation of the photolytic HONO-source in the atmosphere simulation chamber SAPHIR

Rohrer¹,

Bohn²,

Brauers³

et al. 2005

Atmos. Chem. Phys.

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270

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Abstract. HONO formation has been proposed as an important OH radical source in simulation chambers for more than two decades. Besides the heterogeneous HONO formation by the dark reaction of NO 2 and adsorbed water, a photolytic source has been proposed to explain the elevated reactivity in simulation chamber experiments. However, the mechanism of the photolytic process is not well understood so far. As expected, production of HONO and NO x was also observed inside the new atmospheric simulation chamber SAPHIR under solar irradiation. This photolytic HONO and NO x formation was studied with a sensitive HONO instrument under reproducible controlled conditions at atmospheric concentrations of other trace gases. It is shown that the photolytic HONO source in the SAPHIR chamber is not caused by NO 2 reactions and that it is the only direct NO y source under illuminated conditions. In addition, the photolysis of nitrate which was recently postulated for the observed photolytic HONO formation on snow, ground, and glass surfaces, can be excluded in the chamber. A photolytic HONO source at the surface of the chamber is proposed which is strongly dependent on humidity, on light intensity, and on temperature. An empirical function describes these dependencies and reproduces the observed HONO formation rates to within 10 %. It is shown that the photolysis of HONO represents the dominant radical source in the SAPHIR chamber for typical tropospheric O 3 /H 2 O concentrations. For these conditions, the HONO concentrations inside SAPHIR are similar to recent observations in ambient air.

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“…In order to estimate annual emissions from the individual fluxes usually a median (Rohrer et al, 1998) or (monthly) mean (Levin, 1987;Gaudry et al, 1990;Thom et al, 1993;Schmidt et al, 1996Schmidt et al, , 2001Schmidt et al, , 2003Schrimpf et al, 1996;Wilson et al, 1997;Levy et al, 1999;Biraud et al, 2000;Messager et al, 2008) is used. However, since the ambient measurements are very sensitive for nearby point source emissions, annual emission estimates using a median or a (Gaussian) mean would probably be overestimated.…”

Section: Data Selection and Analysesmentioning

confidence: 99%

“…Using 222 Rn to determine surface fluxes from mixing ratios has already been successfully applied in other studies e.g. to: CO 2 (Levin, 1987;Gaudry et al, 1990;Schmidt et al, 2003), N 2 O (Schmidt et al, 2001;Wilson et al, 1997), CH 4 (Thom et al, 1993;Schmidt et al, 1996;Levin et al, 1999), CFCs (Biraud et al, 2002), peroxyacetyl nitrate (Schrimpf et al, 1996) and NO and NO 2 (Rohrer et al, 1998). New aspects of our study are related to the aimedat catchment area of the emissions (in our case we focus mainly on The Netherlands), and our data selection method.…”

Section: Introductionmentioning

confidence: 99%

Methane and nitrous oxide emissions in The Netherlands: ambient measurements support the national inventories

2009

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Abstract. We present net emission estimates of CH 4 and N 2 O of The Netherlands based on measurements conducted during the period of May 2006 to April 2009 at station Lutjewad, The Netherlands (6 • 21 E, 53 • 24 N, 1 m a.s.l.). 222 Radon mixing ratios were applied as an indicator for vertical mixing and long-range air mass transport and used to calculate the net surface fluxes from atmospheric mixing ratios of CH 4 and N 2 O. Our study shows that our measurement site Lutjewad is well-suited to measure emissions from The Netherlands and validation of the national inventories using the 222 Radon flux method. Since this study is purely observation-based it is independent from inventories or atmospheric models. Our results are compared to the national inventories as reported to the UNFCCC. We found net emissions of: (15.2±5.3) t km −2 a −1 for CH 4 and (0.9±0.3) t km −2 a −1 for N 2 O. These values are lower than the inventory-based emissions (2006-2008 averages) of (18.3±3.3) t km −2 a −1 for CH 4 , and (1.3±0.6) t km −2 a −1 for N 2 O, but the differences are insignificant.

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Mixing Ratios and Photostationary State of NO and NO2 Observed During the POPCORN Field Campaign at a Rural Site in Germany

Cited by 16 publications

References 23 publications

Long optical cavities for open-path monitoring of atmospheric trace gases and aerosol extinction

Long optical cavities for open-path monitoring of atmospheric trace gases and aerosol extinction

Characterisation of the photolytic HONO-source in the atmosphere simulation chamber SAPHIR

Methane and nitrous oxide emissions in The Netherlands: ambient measurements support the national inventories

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