A cavity ring down/cavity enhanced absorption device for measurement of ambient NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; and N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O&amp;lt;sub&amp;gt;5&amp;lt;/sub&amp;gt;

Schuster, G.; Labazan, Irena; Crowley, John N.

doi:10.5194/amt-2-1-2009

Cited by 69 publications

(100 citation statements)

References 35 publications

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“…Aspects of the instrument that affect its accuracy, such as the inlet system and calibration methods, are similar to those described here. The UAF-CRDS instrument is described by Ayers et al (2005); Ayers and Simpson (2006); Apodaca (2008) and the MPI-CRDS by Schuster et al (2009). A summary of the properties of these instruments as operated during this campaign is given in Table 1.…”

Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

“…For MPI-CRDS a sticking coefficient was derived from the reduction of the signal for increasing residence time of the sampled air. The value for the MPI-CRDS instrument was derived from measurement of the NO 3 loss after N 2 O 5 decomposition in the hot inlet and cavity (Schuster et al, 2009). A total loss of 10 ± 10 % and 9 % for the measurement of the sum of NO 3 and N 2 O 5 was determined for the MPI-CRDS and UAF-CRDS instruments, respectively, for their operational conditions.…”

Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

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Comparison of N2O5 mixing ratios during NO3Comp 2007 in SAPHIR

et al. 2012

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Abstract. N 2 O 5 detection in the atmosphere has been accomplished using techniques which have been developed during the last decade. Most techniques use a heated inlet to thermally decompose N 2 O 5 to NO 3 , which can be detected by either cavity based absorption at 662 nm or by laserinduced fluorescence. In summer 2007, a large set of instruments, which were capable of measuring NO 3 mixing ratios, were simultaneously deployed in the atmosphere simulation chamber SAPHIR in Jülich, Germany. Some of these instruments measured N 2 O 5 mixing ratios either simultaneously or alternatively. Experiments focused on the investigation of potential interferences from, e.g., water vapour or aerosol and on the investigation of the oxidation of biogenic volatile organic compounds by NO 3 . The comparison of N 2 O 5 mixing ratios shows an excellent agreement between measurements of instruments applying different techniques (3 cavity ring-down (CRDS) instruments, 2 laser-induced fluorescence (LIF) instruments). Datasets are highly correlated as indicated by the square of the linear correlation coefficients, R 2 , which values were larger than 0.96 for the entire datasets. N 2 O 5 mixing ratios well agree within the combined accuracy of measurements. Slopes of the linear regression range between 0.87 and 1.26 and intercepts are negligible. The most critical aspect of N 2 O 5 measurements by cavity ring-down instruments is the determination of the inlet and filter transmission efficiency. Measurements here show that the N 2 O 5 inlet transmission efficiency can decrease in the presence of high aerosol loads, and that frequent filter/inlet changing is necessary to quantitatively sample N 2 O 5 in some environments. The analysis of data also demonstrates that a general correction for degrading filter transmission is not applicable for all conditions encountered during this campaign. Besides the effect of a gradual degradation of the inlet transmission efficiency aerosol exposure, no other interference for N 2 O 5 measurements is found.

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Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

Section: Cavity Ring-down Spectroscopymentioning

confidence: 99%

Comparison of N2O5 mixing ratios during NO3Comp 2007 in SAPHIR

et al. 2012

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“…N 2 O 5 and NO 3 were measured using cavity ring-down spectroscopy (CRDS) with instruments described by Schuster et al (2009) and Crowley et al (2010). NO 3 was measured directly in a cavity at ambient temperature whereas the sum N 2 O 5 + NO 3 was measured in a separate cavity at ∼ 100 • C after thermal decomposition of N 2 O 5 to NO 3 in a heated section of the inlet, also at 100 • C. Following corrections for the transmission of NO 3 and N 2 O 5 through the inlets, filter and cavities, the difference signal is used to calculated N 2 O 5 mixing ratios.…”

Section: Instrumentationmentioning

confidence: 99%

Estimating N2O5 uptake coefficients using ambient measurements of NO3, N2O5, ClNO2 and particle-phase nitrate

et al. 2016

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Abstract. We present an estimation of the uptake coefficient (γ ) and yield of nitryl chloride (ClNO 2 ) (f ) for the heterogeneous processing of dinitrogen pentoxide (N 2 O 5 ) using simultaneous measurements of particle and trace gas composition at a semi-rural, non-coastal, mountain site in the summer of 2011. The yield of ClNO 2 varied between (0.035 ± 0.027) and (1.38 ± 0.60) with a campaign average of (0.49 ± 0.35). The large variability in f reflects the highly variable chloride content of particles at the site. Uptake coefficients were also highly variable with minimum, maximum and average γ values of 0.004, 0.11 and 0.028 ± 0.029, respectively, with no significant correlation with particle composition, but a weak dependence on relative humidity. The uptake coefficients obtained are compared to existing parameterizations based on laboratory datasets and with other values obtained by analysis of field data.

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“…NO 3 (and N 2 O 5 ) mixing ratios were measured using a twochannel, cavity ring-down system, which has recently been described in detail (Crowley et al, 2010b;Schuster et al, 2009). The reported detection limit for NO 3 is 1-2 ppt in 3 s integration.…”

Section: Measurement Of No 3 and N 2 Omentioning

confidence: 99%

Simulations of atmospheric OH, O3 and NO3 reactivities within and above the boreal forest

et al. 2015

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Abstract. Using the 1-D atmospheric chemistry transport model SOSAA, we have investigated the atmospheric reactivity of a boreal forest ecosystem during the HUMPPA-COPEC-10 campaign (summer 2010, at SMEAR II in southern Finland). For the very first time, we present vertically resolved model simulations of the NO 3 and O 3 reactivity (R) together with the modelled and measured reactivity of OH. We find that OH is the most reactive oxidant (R ∼ 3 s −1 ) followed by NO 3 (R ∼ 0.07 s −1 ) and O 3 (R ∼ 2 × 10 −5 s −1 ). The missing OH reactivity was found to be large in accordance with measurements (∼ 65 %) as would be expected from the chemical subset described in the model. The accounted OH radical sinks were inorganic compounds (∼ 41 %, mainly due to reaction with CO), emitted monoterpenes (∼ 14 %) and oxidised biogenic volatile organic compounds (∼ 44 %). The missing reactivity is expected to be due to unknown biogenic volatile organic compounds and their photoproducts, indicating that the true main sink of OH is not expected to be inorganic compounds. The NO 3 radical was found to react mainly with primary emitted monoterpenes (∼ 60 %) and inorganic compounds (∼ 37 %, including NO 2 ). NO 2 is, however, only a temporary sink of NO 3 under the conditions of the campaign (with typical temperatures of 20-25 • C) and does not affect the NO 3 concentration. We discuss the difference between instantaneous and steadystate reactivity and present the first boreal forest steady-state lifetime of NO 3 (113 s). O 3 almost exclusively reacts with inorganic compounds (∼ 91 %, mainly NO, but also NO 2 during night) and less with primary emitted sesquiterpenes (∼ 6 %) and monoterpenes (∼ 3 %). When considering the concentration of the oxidants investigated, we find that OH is the oxidant that is capable of removing organic compounds at a faster rate during daytime, whereas NO 3 can remove organic molecules at a faster rate during night-time. O 3 competes with OH and NO 3 during a short period of time in the early morning (around 5 a.m. local time) and in the evening (around 7-8 p.m.). As part of this study, we developed a simple empirical parameterisation for conversion of measured spectral irradiance into actinic flux. Further, the meteorological conditions were evaluated using radiosonde observations and ground-based measurements. The overall vertical structure of the boundary layer is discussed, together with validation of the surface energy balance and turbulent fluxes. The sensible heat and momentum fluxes above the canopy were on average overestimated, while the latent heat flux was underestimated.

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A cavity ring down/cavity enhanced absorption device for measurement of ambient NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub>

Cited by 69 publications

References 35 publications

Comparison of N<sub>2</sub>O<sub>5</sub> mixing ratios during NO3Comp 2007 in SAPHIR

Comparison of N<sub>2</sub>O<sub>5</sub> mixing ratios during NO3Comp 2007 in SAPHIR

Estimating N<sub>2</sub>O<sub>5</sub> uptake coefficients using ambient measurements of NO<sub>3</sub>, N<sub>2</sub>O<sub>5</sub>, ClNO<sub>2</sub> and particle-phase nitrate

Simulations of atmospheric OH, O<sub>3</sub> and NO<sub>3</sub> reactivities within and above the boreal forest

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A cavity ring down/cavity enhanced absorption device for measurement of ambient NO&lt;sub&gt;3&lt;/sub&gt; and N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;

Cited by 69 publications

References 35 publications

Comparison of N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; mixing ratios during NO3Comp 2007 in SAPHIR

Comparison of N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; mixing ratios during NO3Comp 2007 in SAPHIR

Estimating N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; uptake coefficients using ambient measurements of NO&lt;sub&gt;3&lt;/sub&gt;, N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt;, ClNO&lt;sub&gt;2&lt;/sub&gt; and particle-phase nitrate

Simulations of atmospheric OH, O&lt;sub&gt;3&lt;/sub&gt; and NO&lt;sub&gt;3&lt;/sub&gt; reactivities within and above the boreal forest

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A cavity ring down/cavity enhanced absorption device for measurement of ambient NO<sub>3</sub> and N<sub>2</sub>O<sub>5</sub>

Comparison of N<sub>2</sub>O<sub>5</sub> mixing ratios during NO3Comp 2007 in SAPHIR

Comparison of N<sub>2</sub>O<sub>5</sub> mixing ratios during NO3Comp 2007 in SAPHIR

Estimating N<sub>2</sub>O<sub>5</sub> uptake coefficients using ambient measurements of NO<sub>3</sub>, N<sub>2</sub>O<sub>5</sub>, ClNO<sub>2</sub> and particle-phase nitrate

Simulations of atmospheric OH, O<sub>3</sub> and NO<sub>3</sub> reactivities within and above the boreal forest