Fast photochemistry in wintertime haze
WebWintertime photochemistry in Beijing: ... Fast increasing of surface ozone concentrations in Pearl River Delta characterized by a regional air quality monitoring network during 2006–2011 ... Journal of Environmental Sciences 26 (1), 23-36, 2014. 117: 2014: Fast photochemistry in wintertime haze: consequences for pollution mitigation ... WebFast photochemistry in winter resulting in substantial O3formation has been previously reported. In the basins of the US, high O3concentrations up to 140 ppb were observed in winter during the stagnant meteorological conditions with abundant VOCs emissions from gas and oil productions [3,4].
Fast photochemistry in wintertime haze
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WebIn contrast to summer smog, the contribution of photochemistry to the formation of winter haze in northern mid-to-high latitude is generally assumed to be minor due to reduced solar UV and water vapor concentrations. Our comprehensive observations of atmospheric radicals and relevant parameters during several haze events in winter 2016 Beijing, … WebSep 1, 2024 · adshelp[at]cfa.harvard.edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A
WebThe first wintertime in situ measurements of hydroxyl (OH), hydroperoxy (HO2) and organic peroxy (RO2) radicals (ROx = OH + HO2 + RO2) in combination with observations of total reactivity of OH... WebMar 1, 2024 · Ozone concentrations are highest in summer, driven by fast photochemical production of hydrogen oxide radicals (HO x) that can overcome the radical titration …
WebApr 28, 2024 · radicals (OH) can be surprisingly fast under low light levels during winter haze conditions (Lu et al., 2024; Tan et al., 2024 ). Wang et al. ( 2024 ) showed that gas-phase chemistry produces ... WebMar 10, 2024 · The haze episodes with PM2.5 mass concentration peak exceeding 150 μg m −3 in the winters of 2024–2024 were showed in Fig. 7. In autumn-winter transition …
WebAug 26, 2024 · This boosted radical recycling generates fast photochemical ozone production rates that are again comparable to those during summer photochemical …
Webphotochemistry in winter Beijing. • Consistently, fast photochemical reaction rates that drive formation of ozone and particulate nitrate are experimentally determined from … control\u0027s waWebMar 31, 2024 · The average mass concentration for the nonrefractory PM 2.5 (NR-PM 2.5 ) was 38.6 ± 40.1 μg m −3 , lower than the annual values from 58.7 to 94.0 μg m −3 reported in Beijing from 2008 to 2016. 4 In... fallout 32WebEnhanced local photochemistry has been identified as the dominant factor that controls PAN increase in the morning at the rural site, as the time when prevailing wind turned to … fallout 3 20th century weaponsWebLu, K., Fuchs, H., Hofzumahaus, A., Tan, Z., Wang, H., Zhang, L., … Zhang, Y. (2024). Fast photochemistry in wintertime haze: Consequences for pollution mitigation ... fallout 3 32:9WebDec 1, 2024 · In contrast, recent field measurements or model simulations observed that photochemistry also played an important role in the formation of winter ozone or haze events in the urban environment of Beijing or Utah, which was attributed to the efficient photolysis of nitrous acid (HONO, (R11)), a significant precursor of daytime OH (Lu et al., … control\u0027s wbWebHowever, recent studies in China found that PAN concentrations on winter haze days could be as high as those observed in summer photochemical smog (Liu et al, 2024; Qiu, Ma, et al, 2024; G. Zhang, Xia, et al, 2024; B. Zhang et al, 2024 ), suggesting potential contributions from unfavorable meteorological conditions and local photochemical … control\u0027s wgWebDec 9, 2024 · Our study explores the cause of the rapid increase in PAN concentrations at a background site of the NCP region and emphasizes the important role of HCHO in … fallout 3 2023