Comparison of atmospheric nitrous acid during severe haze and clean periods in Beijing, China

Hou, Siqi; Tong, Shengrui; Ge, Maofa; An, Junling

doi:10.1016/j.atmosenv.2015.06.023

Cited by 112 publications

(98 citation statements)

References 43 publications

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“…Previous studies have shown that the maximum HONO/NO 2 ratio was positively dependent to RH below 70 % and negatively dependent when RH>70 % in Shanghai area (Hao et al 2006;Wang et al 2013). In addition, a positive dependence of HONO/NO 2 with RH was also observed in the study of Hou et al (2015) for RH≤65 % in Beijing area. Based on LOPAP and DOAS measurements, the correlation between RH and the HONO formation rate through the reaction of NO 2 with adsorbed water on surfaces during the night has been examined.…”

Section: Time Series Of Hono No 2 and Hono/no 2 Ratiomentioning

confidence: 55%

Measurements of nitrous acid (HONO) in urban area of Shanghai, China

Bernard

Cazaunau

Grosselin

et al. 2015

Environ Sci Pollut Res

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Nitrous acid (HONO), as a precursor of the hydroxyl radical (OH), plays an important role in the photochemistry of the troposphere, especially in the polluted urban atmosphere. A field campaign was conducted to measure atmospheric HONO concentration and that of other pollutants (such as NO 2 and particle mass concentration) in the autumn of 2009 at Shanghai urban areas. HONO mixing ratios were simultaneously measured by three different techniques: long path absorption photometer (LOPAP), differential optical absorption spectroscopy (DOAS) and chemical ionization mass spectrometer (CIMS). The measurements showed that the mixing ratios of HONO were highly variable and depended strongly on meteorological parameters. The HONO levels ranged from 0.5 to 7 ppb with maximum values during early morning and minimum levels during late afternoon. The three instruments reproduced consistent diurnal pattern of HONO concentrations with higher concentration during the night compared to the daylight hours. Comparison of HONO LOPAP /HONO CIMS ratios during daytime and nighttime periods exhibited a non-systematic disagreement of 0.93 and 1.16, respectively. This would indicate different chemical compositions of sampled air for the LOPAP and the CIMS instruments during daytime and nighttime periods, which have possibly affected measurements. Mean HONO concentration reported by LOPAP was 33 % higher than by DOAS on the whole period with no significant difference between daytime and nighttime periods. This revealed a systematic deviation from both instruments. The present data provides complementary information of HONO ambient levels in the atmosphere of Shanghai urban areas.

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Section: Time Series Of Hono No 2 and Hono/no 2 Ratiomentioning

confidence: 55%

Measurements of nitrous acid (HONO) in urban area of Shanghai, China

Bernard

Cazaunau

Grosselin

et al. 2015

Environ Sci Pollut Res

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“…Hou et al . [] reported that the HONO excess increased substantially during severe haze in Beijing and that the HONO concentration was closely correlated with the PM 2.5 mass concentration. All of these studies provide evidence that aerosols may be associated with the major excess HONO source.…”

Section: Resultsmentioning

confidence: 99%

“…Liu et al [2014] combined observational data, a 1-D model, and a 3-D chemical transport model to demonstrate that the heterogeneous reaction of NO 2 on aerosol surfaces was the major daytime HONO source in Beijing. Hou et al [2016] reported that the HONO excess increased substantially during severe haze in Beijing and that the HONO concentration was closely correlated with the PM 2.5 mass concentration. All of these studies provide evidence that aerosols may be associated with the major excess HONO source.…”

Section: Effect Of Aerosols On O 3 Formationmentioning

confidence: 99%

Radical budget and ozone chemistry during autumn in the atmosphere of an urban site in central China

Chen²,

Wang

et al. 2017

JGR Atmospheres

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The ROx (=OH + HO2 + RO2) budget and O3 production at an urban site in central China (Wuhan) during autumn were simulated and analyzed for the first time using a UW Chemical Model 0‐D box model constrained by in situ observational data. The daytime average OH, HO2, and RO2 concentrations were 2.2 × 106, 1.0 × 108, and 5.2 × 107 molecules cm−3, respectively. The average daytime O3 production rate was 8.8 ppbv h−1, and alkenes were the most important VOC species for O3 formation (contributing 45%) at this site. Our sensitivity test indicated that the atmospheric environment in Wuhan during autumn belongs to the VOC‐limited regime. The daily average HONO concentration at this site during the study period reached 1.1 ppbv and played an important role in the oxidative capacity of the atmosphere. Without the source of excess HONO, the average daytime OH, HO2, RO2, and O3 production rates decreased by 36%, 26%, 27%, and 31% respectively. A correlation between the HONO to NO2 heterogeneous conversion efficiency and PM2.5 × SWR was found at this site; based on this relationship, if the PM2.5 concentration met the World Health Organization air quality standard (25 µg m−3), the O3 production rate in this city would decrease by 19% during late autumn. The burning of agricultural biomass severely affected the air quality in Wuhan during summer and autumn. Agricultural burning was found to account for 18% of the O3 formation during the study period. Our results suggest that VOC control and a ban on agricultural biomass burning should be considered as high‐priority measures for improving the air quality in this region.

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“…During the last decades, many field measurement campaigns have reported unusually high nitrous acid (HONO) concentrations during daytime for remote (Zhou et al, 2002;Acker et al, 2006a;Sörgel et al, 2011a;Villena et al, 2011;Oswald et al, 2015;Meusel et al, 2016), semi-urban (Neftel et al, 1996;Staffelbach et al, 1997;Kleffmann et al, 2005;Su et al, 2008;Li et al, 2012;Yang et al, 2014) and urban regions (Kleffmann et al, 2002, Ren et al, 2003Acker et al, 2006b;Elshorbany et al, 2009Elshorbany et al, , 2010Hou et al, 2016;Lee et al, 2016). These results stimulated laboratory investigations on potential HONO precursors from which the most frequently discussed mechanisms are (i) the photosensitized reduction of nitrogen dioxide (NO 2 ) by organic material, e.g.…”

Section: Introductionmentioning

confidence: 88%

Diurnal fluxes of HONO above a crop rotation

Laufs¹,

Cazaunau²,

Stella³

et al. 2017

Atmos. Chem. Phys.

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Abstract. Nitrous acid (HONO) fluxes were measured above an agricultural field site near Paris during different seasons. Above bare soil, different crops were measured using the aerodynamic gradient (AG) method. Two LOPAPs (LOng Path Absorption Photometer) were used to determine the HONO gradients between two heights. During daytime mainly positive HONO fluxes were observed, which showed strong correlation with the product of the NO 2 concentration and the long wavelength UV light intensity, expressed by the photolysis frequency J (NO 2 ). These results are consistent with HONO formation by photosensitized heterogeneous conversion of NO 2 on soil surfaces as observed in recent laboratory studies. An additional influence of the soil temperature on the HONO flux can be explained by the temperature-dependent HONO adsorption on the soil surface. A parameterization of the HONO flux at this location with NO 2 concentration, J (NO 2 ), soil temperature and humidity fits reasonably well all flux observations at this location.

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Comparison of atmospheric nitrous acid during severe haze and clean periods in Beijing, China

Cited by 112 publications

References 43 publications

Measurements of nitrous acid (HONO) in urban area of Shanghai, China

Measurements of nitrous acid (HONO) in urban area of Shanghai, China

Radical budget and ozone chemistry during autumn in the atmosphere of an urban site in central China

Diurnal fluxes of HONO above a crop rotation

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