Observations of nitrous acid and its relative humidity dependence in Shanghai

Hao, Nan; Zhou, Bin; Chen, Dan; Chen, Limin

doi:10.1016/s1001-0742(06)60013-2

Cited by 39 publications

(48 citation statements)

References 23 publications

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“…A mean concentration of 1.1 ppb has been measured previously at the same location from October 2004 to January 2005 (Hao et al 2006) and a mean value of 0.92 ppb has been reported from 2 years observations between August 2010 and June 2012 (Wang et al 2013). It should be mentioned that the HONO concentration levels at this location have been observed to be independent from temporal variations such as seasons and months (Wang et al 2013).…”

Section: Resultssupporting

confidence: 65%

“…The mean concentrations during daytime (07:00-17:00 LT) and nighttime (18:00-06:00 LT) periods have been estimated to be 1.0 and 1.5 ppb, respectively. Our measurements have been compared with those conducted in the same location previously, between 22 October 2004 and 4 January 2005 (Hao et al 2006). These authors reported a mean HONO daytime concentration (07:00-17:00 LT) of 0.7 ppb and a mean nighttime concentration (18:00-06:00 LT) of 1.4 ppb.…”

Section: Resultsmentioning

confidence: 80%

“…Atmospheric concentrations of HONO in Shanghai urban area have been recently reported in two studies (Hao et al 2006;Wang et al 2013). Both measurements have been carried out by the same differential optical absorption spectroscopy (DOAS) technique.…”

Section: Responsible Editor: Gerhard Lammelmentioning

confidence: 95%

“…Concentration levels of HONO reached a maximum of ∼7 ppb, in agreement with previous observations in other large cities (Winer and Biermann 1994;Febo et al 1996;Qin et al 2009). These measurements in Shanghai (China) showed that the combination of surface and relative humidity promoted the heterogeneous conversion of NO 2 into HONO and would contribute to the observed concentration of HONO in the urban area of Shanghai (Hao et al 2006).…”

Section: Responsible Editor: Gerhard Lammelmentioning

confidence: 97%

“…Figure S2 illustrates the beam of the DOAS instrument running above Handan Road. The instrument has been described in details elsewhere (Yu et al 2004;Hao et al 2006;Wang et al 2013 (Stutz et al 2000) and NO 2 (Mérienne et al 1995 …”

Section: Lopap (Long Path Absorption Photometer)mentioning

confidence: 99%

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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: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 80%

Section: Responsible Editor: Gerhard Lammelmentioning

confidence: 95%