2012
DOI: 10.1016/j.atmosenv.2012.07.079
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Aqueous phase sulfate production in clouds in eastern China

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Cited by 92 publications
(106 citation statements)
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“…Hydrogen peroxide plays a central role in various important chemical processes in clouds. First, H 2 O 2 is considered the most important oxidant for the conversion of sulfite to sulfate for pH lower than 5.5, thereby contributing significantly to the acidification of clouds and precipitations (Deguillaume et al, 2005;Shen et al, 2012). Second, the photolysis of H 2 O 2 will lead to an efficient production of the hydroxyl radical HO q (Arakaki et al, 2013), and recent studies have shown that this can be a dominant aqueous source (Bianco et al, 2015).…”
Section: Introductionmentioning
confidence: 99%
“…Hydrogen peroxide plays a central role in various important chemical processes in clouds. First, H 2 O 2 is considered the most important oxidant for the conversion of sulfite to sulfate for pH lower than 5.5, thereby contributing significantly to the acidification of clouds and precipitations (Deguillaume et al, 2005;Shen et al, 2012). Second, the photolysis of H 2 O 2 will lead to an efficient production of the hydroxyl radical HO q (Arakaki et al, 2013), and recent studies have shown that this can be a dominant aqueous source (Bianco et al, 2015).…”
Section: Introductionmentioning
confidence: 99%
“…5). Meteorological back-trajectories indicate the same source region (the heavily populated, industrial South China Plain) for air masses involved in all cloud samples (Shen, 2011). Because it is difficult to both collect and to fully and continuously speciate cloud water, many studies use simple surrogate cloud water solutions to better constrain yields and reaction pathways, impeding direct comparison of our findings to the literature.…”
Section: Discussionmentioning
confidence: 97%
“…The resulting [OH] aq was quantified in the cloud samples (and deionized water for comparison purposes) via absorption spectroscopy of 202 nm light by salicylic acid, which was below detection limit in the cloud samples, preceded by reverse phase liquid chromatography separation to prevent measurement interference from other absorbing species (N = 3; accounting for salicylic acid direct photolysis and using the secondorder rate constant of 1.6 × 10 10 M -1 s -1 ; see Boris et al, 2014); these measurements yielded 1.9 × 10 −14 M OH within the cloud water and 5.4 ± 0.5 × 10 −14 M OH within pure water (Boris et al, 2014). Before hydrogen peroxide addition, these ambient cloud samples contained [HOOH] aq = 1-100 µM (Shen, 2011) (Jacob, 1986;Arakaki and Faust, 1998;Ervens et al, 2003b;Deguillaume et al, 2005;Ervens and Volkamer, 2010), 1-2 orders of magnitude lower than used in similar laboratory experiments (Lim et al, 2010;Lee et al, 2011a). These solutions are among the most atmospherically relevant used in the laboratory to date; methodological assessment of evaporative cycling effects and OH exposure is discussed further in supplement Section S4.…”
mentioning
confidence: 99%
“…The secondary inorganic species (nitrate, sulfate and ammonium) appeared to rapidly increase because the atmospheric environment exists at a high RH, and the aqueous-phase oxidation is much faster than gas-phase oxidation processes (Seinfeld and Pandis, 2006). The oxidation state in the aqueous-phase relies on droplet pH and mass concentrations of oxidants (Shen et al, 2012). Similar to NR-PM 1 species, the OA components presented synchronous enhancements at high RH levels, especially the OOA, which accounted for 36% of OA and showed the largest enhancement (from 3.5 µg m -3 increased to 8.9 µg m -3 ).…”
Section: Relative Humidity (Rh) Effects On Chemical Componentsmentioning
confidence: 89%