In situ monitoring of atmospheric nitrous acid based on multi-pumping flow system and liquid waveguide capillary cell

Liu, Yuhan; Lu, Keding; Dong, Huabin; Li, Xin; Cheng, Peng; Zou, Qi; Wu, Yusheng; Liu, Xingang; Zhang, Yuanhang

doi:10.1016/j.jes.2015.11.034

Cited by 31 publications

(31 citation statements)

References 44 publications

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“…Custom-built instruments from FZJ (Forschungszentrum Jülich) and from PKU (Liu et al, 2016) utilized long-path absorption photometry (LOPAP). In addition, three custom-built instruments applied cavity-enhanced absorption spectroscopy (CEAS) for the detection of HONO.…”

Section: Instrumentationmentioning

confidence: 99%

OH reactivity at a rural site (Wangdu) in the North China Plain: contributions from OH reactants and experimental OH budget

Fuchs¹,

Tan

et al. 2017

Atmos. Chem. Phys.

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Abstract. In 2014, a large, comprehensive field campaign was conducted in the densely populated North China Plain. The measurement site was located in a botanic garden close to the small town Wangdu, without major industry but influenced by regional transportation of air pollution. The loss rate coefficient of atmospheric hydroxyl radicals (OH) was quantified by direct measurements of the OH reactivity. Values ranged between 10 and 20 s −1 for most of the daytime. Highest values were reached in the late night with maximum values of around 40 s −1 . OH reactants mainly originated from anthropogenic activities as indicated (1) by a good correlation between measured OH reactivity and carbon monoxide (linear correlation coefficient R 2 = 0.33) and (2) by a high contribution of nitrogen oxide species to the OH reactivity (up to 30 % in the morning). Total OH reactivity was measured by a laser flash photolysis-laser-induced fluorescence instrument (LP-LIF). Measured values can be explained well by measured trace gas concentrations including organic compounds, oxygenated organic compounds, CO and nitrogen oxides. Significant, unexplained OH reactivity was only observed during nights, when biomass burning of agricultural waste occurred on surrounding fields. OH reactivity measurements also allow investigating the chemical OH budget. During this campaign, the OH destruction rate calculated from measured OH reactivity and measured OH concentration was balanced by the sum of OH production from ozone and nitrous acid photolysis and OH regeneration from hydroperoxy radicals within the uncertainty of measurements. However, a tendency for higher OH destruction compared to OH production at lower concentrations of nitric oxide is also observed, consistent with previous findings in field campaigns in China.

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Section: Instrumentationmentioning

confidence: 99%

OH reactivity at a rural site (Wangdu) in the North China Plain: contributions from OH reactants and experimental OH budget

Fuchs¹,

Tan

et al. 2017

Atmos. Chem. Phys.

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“…To determine of the sample loss of HONO, a HONO standard generator was developed to supply stable concentrations of 10 HONO (Kleffmann et al, 2004;Liu et al, 2016). The schematic of the HONO standard generator is shown in Fig.…”

Section: Sample Lossmentioning

confidence: 99%

Development of an incoherent broadband cavity enhanced absorption spectrometer for in situ measurements of HONO and NO<sub>2</sub> in China

Duan¹,

Qin²,

Ouyang³

et al. 2018

Preprint

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Abstract. Gaseous nitrous acid (HONO) is an important source of OH radical in the troposphere. However, its source, especially that during daytime hours remains unclear. We report hereby a home-built instrument for simultaneous unambiguous measurements of HONO and NO2 with high time resolution based on incoherent broadband cavity enhanced 20 absorption spectroscopy (IBBCEAS). To achieve robust performance and system stability under different environment conditions, the current IBBCEAS instrument has made significant improvements in terms of efficient sampling as well as resistance against vibration and temperature change, and the IBBCEAS instrument also has low-power consumption and a compact design that can be easily deployed on different platforms powered by a high-capacity lithium ion battery. The effective cavity length of the IBBCEAS was determined using the absorption of O2-O2 to account for the "shortening" effect 25 caused by the mirror purge flows. The wall loss for HONO was estimated to be 2 % via a HONO standard generator. NO2 being ~0.89 and ~0.95, respectively, in addition, vehicle deployments were also tried to enable mobile measurements of HONO and NO2, demonstrating the promising potential of using IBBCEAS for in situ, sensitive, accurate and fast simultaneous measurements of HONO and NO2 in the future.Atmos. Meas. Tech. Discuss., https://doi

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“…The measurement is based on artificial OH generation by pulsed laser flash photolysis (LP) of ozone in ambient air combined with the detection of the temporal OH decay by LIF. The method was initially developed for field appli- cation by Sadanaga et al (2004) and is applied today by several other groups (Lou et al, 2010;Parker et al, 2011;Stone et al, 2016). The instrument deployed in this campaign is similar to the instrument described in Lou et al (2010), which was used for measurements in our two field campaigns in 2006 in China.…”

Section: Oh Reactivity Measurementsmentioning

confidence: 99%

“…The method was initially developed for field appli- cation by Sadanaga et al (2004) and is applied today by several other groups (Lou et al, 2010;Parker et al, 2011;Stone et al, 2016). The instrument deployed in this campaign is similar to the instrument described in Lou et al (2010), which was used for measurements in our two field campaigns in 2006 in China. Since then, a second instrument has been built specifically for the deployment on a Zeppelin NT airship , but it can also be operated on the ground.…”

Section: Oh Reactivity Measurementsmentioning

confidence: 99%

“…For our previous field campaigns in China, the measured OH reactivity was 2 times larger than the calculated k OH . The discrepancy could be quantitatively explained by the reactivity from oxygenated VOCs (OVOCs), which were not measured but estimated by a chemical model (Lou et al, 2010;Lu et al, 2013). In this campaign, the number of measured species was extended and included important atmospheric OVOCs, for example formaldehyde, acetaldehyde, isoprene oxidation products (methyl-vinyl ketone and methacrolein) and glyoxal.…”

Section: Introductionmentioning

confidence: 99%

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Fuchs¹

2016

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In 2014, a large, comprehensive field campaign was conducted in the densely populated North China Plain. The measurement site was located in a botanic garden close to the small town Wangdu, without major industry but influenced by regional transportation of air pollution. The loss rate coefficient of atmospheric hydroxyl radicals (OH) was quantified by direct measurements of the OH reactivity. Values ranged between 10 and 20 s −1 for most of the daytime. Highest values were reached in the late night with maximum values of around 40 s −1 . OH reactants mainly originated from anthropogenic activities as indicated (1) by a good correlation between measured OH reactivity and carbon monoxide (linear correlation coefficient R 2 = 0.33) and (2) by a high contribution of nitrogen oxide species to the OH reactivity (up to 30 % in the morning). Total OH reactivity was measured by a laser flash photolysis-laser-induced fluorescence instrument (LP-LIF). Measured values can be explained well by measured trace gas concentrations includ-ing organic compounds, oxygenated organic compounds, CO and nitrogen oxides. Significant, unexplained OH reactivity was only observed during nights, when biomass burning of agricultural waste occurred on surrounding fields. OH reactivity measurements also allow investigating the chemical OH budget. During this campaign, the OH destruction rate calculated from measured OH reactivity and measured OH concentration was balanced by the sum of OH production from ozone and nitrous acid photolysis and OH regeneration from hydroperoxy radicals within the uncertainty of measurements. However, a tendency for higher OH destruction compared to OH production at lower concentrations of nitric oxide is also observed, consistent with previous findings in field campaigns in China.

show abstract

In situ monitoring of atmospheric nitrous acid based on multi-pumping flow system and liquid waveguide capillary cell

Cited by 31 publications

References 44 publications

OH reactivity at a rural site (Wangdu) in the North China Plain: contributions from OH reactants and experimental OH budget

OH reactivity at a rural site (Wangdu) in the North China Plain: contributions from OH reactants and experimental OH budget

Development of an incoherent broadband cavity enhanced absorption spectrometer for in situ measurements of HONO and NO<sub>2</sub> in China

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In situ monitoring of atmospheric nitrous acid based on multi-pumping flow system and liquid waveguide capillary cell

Cited by 31 publications

References 44 publications

OH reactivity at a rural site (Wangdu) in the North China Plain: contributions from OH reactants and experimental OH budget

OH reactivity at a rural site (Wangdu) in the North China Plain: contributions from OH reactants and experimental OH budget

Development of an incoherent broadband cavity enhanced absorption spectrometer for in situ measurements of HONO and NO&lt;sub&gt;2&lt;/sub&gt; in China

Response to review

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Development of an incoherent broadband cavity enhanced absorption spectrometer for in situ measurements of HONO and NO<sub>2</sub> in China