Simulation chamber studies on the NO<sub>3</sub> chemistry of atmospheric aldehydes

Bossmeyer, J.; Brauers, T.; Richter, Cornelia; Rohrer, Franz; Wegener, Robert; Wahner, Andreas

doi:10.1029/2006gl026778

Cited by 30 publications

(38 citation statements)

References 18 publications

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“…Rohrer et al, 2005;Bossmeyer et al, 2006;Wegener et al, 2007). The chamber consists of double-walled FEP foil (DuPont).…”

Section: Atmosphere Simulation Chamber Saphirmentioning

confidence: 99%

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Brauers¹,

Bossmeyer²,

Dorn³

et al. 2007

Atmos. Chem. Phys.

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Abstract.The results from a simulation chamber study on the formaldehyde (HCHO) absorption cross section in the UV spectral region are presented. We performed 4 experiments at ambient HCHO concentrations with simultaneous measurements of two DOAS instruments in the atmosphere simulation chamber SAPHIR in Jülich. The two instruments differ in their spectral resolution, one working at 0.2 nm (broad-band, BB-DOAS), the other at 2.7 pm (high-resolution, HR-DOAS). Both instruments use dedicated multi reflection cells to achieve long light path lengths of 960 m and 2240 m, respectively, inside the chamber. During two experiments HCHO was injected into the clean chamber by thermolysis of well defined amounts of paraformaldehyde reaching mixing rations of 30 ppbV at maximum. The HCHO concentration calculated from the injection and the chamber volume agrees with the BB-DOAS measured value when the absorption cross section of Meller and Moortgat (2000) and the temperature coefficient of Cantrell (1990) were used for data evaluation. In two further experiments we produced HCHO in-situ from the ozone + ethene reaction which was intended to provide an independent way of HCHO calibration through the measurements of ozone and ethene. However, we found an unexpected deviation from the current understanding of the ozone + ethene reaction when CO was added to suppress possible oxidation of ethene by OH radicals. The reaction of the Criegee intermediate with CO could be 240 times slower than currently assumed. Based on the BB-DOAS measurements we could deduce a high-resolution cross section for HCHO which was not measured directly so far.

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“…Rohrer et al, 2005;Bossmeyer et al, 2006;Wegener et al, 2007). The chamber consists of double-walled FEP foil (DuPont).…”

Section: Atmosphere Simulation Chamber Saphirmentioning

confidence: 99%

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Brauers¹,

Bossmeyer²,

Dorn³

et al. 2007

Atmos. Chem. Phys.

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“…The SAPHIR chamber is designed for controlled studies of chemical systems under atmospheric conditions, and has recently been used to study e.g. the HCHO cross section, HONO photolysis, NO 3 +aldehydes, O 3 +alkenes, and NO 2 photolysis Rohrer et al, 2005;Bossmeyer et al, 2006;Brauers et al, 2007;Wegener et al, 2007). The chamber is a double-walled 120 µm thick FEP foil (DuPont) container of cylindrical shape with an effective volume of ∼270 m 3 (5 m diameter and 18 m length).…”

Section: Atmosphere Simulation Chamber Saphirmentioning

confidence: 99%

Organic nitrate and secondary organic aerosol yield from NO<sub>3</sub> oxidation of β-pinene evaluated using a gas-phase kinetics/aerosol partitioning model

et al. 2009

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Abstract. The yields of organic nitrates and of secondary organic aerosol (SOA) particle formation were measured for the reaction NO 3 +β-pinene under dry and humid conditions in the atmosphere simulation chamber SAPHIR at Research Center Jülich. These experiments were conducted at low concentrations of NO 3 (NO 3 +N 2 O 5 <10 ppb) and β-pinene (peak∼15 ppb), with no seed aerosol. SOA formation was observed to be prompt and substantial (∼50% mass yield under both dry conditions and at 60% RH), and highly correlated with organic nitrate formation. The observed gas/aerosol partitioning of organic nitrates can be simulated using an absorptive partitioning model to derive an estimated vapor pressure of the condensing nitrate species of p vap ∼5×10 −6 Torr (6.67×10 −4 Pa), which constrains speculation about the oxidation mechanism and chemical identity of the organic nitrate. Once formed the SOA in this system continues to evolve, resulting in measurable aerosol volume decrease with time. The observations of high aerosol yield from NO x -dependent oxidation of monoterpenes provide an example of a significant anthropogenic source of SOA from biogenic hydrocarbon precursors. Estimates of the NO 3 +β-pinene SOA source strength for California and the globe indicate that NO 3 reactions with monoterpenes are likely an important source (0.5-8% of the global total) of organic aerosol on regional and global scales.

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“…Long path DOAS: NO 3 was measured by DOAS with a multiple reflection setup [41,42]. Light from a conventional Xe arc lamp (Osram, XBO 75 W=2) was directed into a multireflection cell of 20 m base length, which was set up along the axis of the cylindrical SAPHIR chamber.…”

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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Simulation chamber studies on the NO₃ chemistry of atmospheric aldehydes

Cited by 30 publications

References 18 publications

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Organic nitrate and secondary organic aerosol yield from NO<sub>3</sub> oxidation of β-pinene evaluated using a gas-phase kinetics/aerosol partitioning model

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

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Simulation chamber studies on the NO3 chemistry of atmospheric aldehydes

Cited by 30 publications

References 18 publications

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Organic nitrate and secondary organic aerosol yield from NO&lt;sub&gt;3&lt;/sub&gt; oxidation of β-pinene evaluated using a gas-phase kinetics/aerosol partitioning model

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

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Simulation chamber studies on the NO₃ chemistry of atmospheric aldehydes

Organic nitrate and secondary organic aerosol yield from NO<sub>3</sub> oxidation of β-pinene evaluated using a gas-phase kinetics/aerosol partitioning model