Atmospheric H2O2 measurement and modeling campaign during summer 2004 in Zagreb, Croatia

Acker, K.; Kezele, Nenad; Klasinc̆, L.; Möller, Detlev; Pehnec, Gordana; Šorgo, Glenda; Wieprecht, W.; Žužul, Silva

doi:10.1016/j.atmosenv.2007.12.011

Cited by 13 publications

(9 citation statements)

References 31 publications

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“…The intensity of solar radiation is a significant factor, as it controls the atmospheric oxidizing capacity (Merkel et al, 2011;Wang et al, 2012b). Furthermore, H 2 O 2 positively correlates with solar radiation (Acker et al, 2008;Marinoni et al, 2011). In recent years, PM 2.5 concentrations have significantly decreased in the PRD, resulting in enhanced solar radiation and actinic flux in the troposphere.…”

Section: Chemical Compositions Of Pm 25mentioning

confidence: 99%

Trends of ambient fine particles and major chemical components in the Pearl River Delta region: Observation at a regional background site in fall and winter

Wang

Guo

et al. 2014

Science of The Total Environment

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Section: Chemical Compositions Of Pm 25mentioning

confidence: 99%

Trends of ambient fine particles and major chemical components in the Pearl River Delta region: Observation at a regional background site in fall and winter

Wang

Guo

et al. 2014

Science of The Total Environment

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“…As an organic peroxide oxidant, PAA contributes to the oxidation capacity of the atmosphere (Barth et al, 2007;Acker et al, 2008) and the formation of secondary sulfate (Lind et al, 1987;Stockwell, et al, 1994); as a reservoir of free radicals, PAA can reflect the free radical levels of the troposphere and indicate the extent of free radical chemistry involved at a particular location (Jackson and Hewitt, 1999;Lee et al, 2000). Furthermore, PAA is thought to have some toxic effects on ecosystem and human beings.…”

Section: Introductionmentioning

confidence: 99%

Peroxyacetic acid in urban and rural atmosphere: concentration, feedback on PAN-NO<sub>x</sub> cycle and implication on radical chemistry

Zhang

Chen

et al. 2010

Atmos. Chem. Phys.

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Abstract. Peroxyacetic acid (PAA) is one of the most important atmospheric organic peroxides, which have received increasing attention for their potential contribution to the oxidation capacity of the troposphere and the formation of secondary aerosols. We report here, for the first time, a series of data for atmospheric PAA concentrations at urban and rural sites, from five field campaigns carried out in China in summer 2006, 2007 and 2008. For these five measurements, daytime mean (08:00-20:00 LT) PAA concentrations on sunlit days were 21.4-148.0 pptv with a maximum level of ∼1 ppbv. The various meteorological and chemical parameters influencing PAA concentrations were examined using Principal Factor Analysis. This statistical analysis shows that the local photochemical production was the major source of PAA, and its concentration increased with increasing temperature, solar radiation and ozone but decreased with increasing NO x (NO and NO 2 ), CO, SO 2 , and relative humidity. Based on the dataset, several issues are highlighted in this study: (i) Because PAA is a product from the photochemical oxidation of some specific volatile organic compounds (VOCs) that lead to acetyl peroxy radicals, the importance of various VOCs with respect to the PAA formation is therefore ranked using the incremental reactivity method. (ii) The contribution of PAN thermal degradation to PAA formation under conditions of different NO x concentrations is estimated based on the chemical kinetics analysis. The result shows that PAN seems to play an important role in the formation of PAA when the NO/NO 2 concentration ratio was less than 0.2 and PAA would correspondingly have feedback on the PAN-NO x cycle. (iii) PAA and other peroxides, such as methyl Correspondence to: Z. M. Chen (zmchen@pku.edu.cn) hydroperoxide (MHP) and H 2 O 2 , usually exhibited a similar asymmetric shape typically shifted to the afternoon. However, under some conditions, H 2 O 2 diurnal cycle was out of phase with MHP and PAA. The combination of linear regression and kinetics analysis indicate that the formation and removal processes of H 2 O 2 may be different from those of MHP and PAA. (iv) Considering that PAA is the reservior of free radicals, its fate is expected to have an effect on the free radical budget in the atmosphere. A box model based on the CBM-IV mechanism has been performed to access its influence on the radical budget. We suggest that the detailed information on PAA in the atmosphere is of importance to better understand the free radical chemistry.

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“…Sauer et al, 1997;Morgan and Jackson, 2002) in line with the observations during DOMINO. Strong diel variations with daytime maxima have been reported for Tabua (Portugal) in June/July 1994 (night: < 15 pptv; day: 0.45 ± 0.33 ppbv) (Sauer et al, 2001), Zagreb (Croatia) in the summer of 2004 (night: 0.2 ± 0.35 ppbv; day: 0.4 ± 0.56 ppbv) (Acker et al, 2008), and et al, 2006). In general, the H2O2 mixing ratios and diel variations reported in this study are in good agreement with previous observations for similar locations.…”

Section: Median Values and Dependence On Hox And Noxmentioning

confidence: 88%

Reply to referee 1

Fischer¹

2019

Preprint

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Hydrogen peroxide (H2O2) plays a significant role in the oxidizing capacity of the atmosphere. It is an efficient oxidant in the liquid phase, and serves as a temporary reservoir for the hydroxyl radical (OH), the most important oxidizing agent in the gas phase. Due to its high solubility, removal of H2O2 due to wet and dry deposition is efficient, being a sink of HOx (OH + HO2) radicals. In the continental boundary layer, the H2O2 budget is controlled by photochemistry, transport and deposition processes. Here we use in-situ observations of H2O2, and account for chemical source and removal mechanisms to study the interplay between these processes. The data were obtained during five ground-based field campaigns across Europe from 2008 to 2014, and bring together observations in a boreal forest, two mountainous sites in Germany, and coastal sites in Spain and Cyprus. Most campaigns took place in the summer, while the measurements in the southwest of Spain took place in early winter. Diel variations in H2O2 are strongly site-dependent and indicate a significant altitude dependence. While boundary layer mixing ratios of H2O2 at low-level sites show classical diel cycles with lowest values in the early morning and maxima around local noon, diel profiles are reversed on mountainous sites due to transport from the nocturnal residual layer and the free troposphere. The concentration of hydrogen peroxide is largely governed by its main precursor, the hydroperoxy radical (HO2), and shows significant anti-correlation with nitrogen oxides (NOx) that remove HO2. A budget calculation indicates that in all campaigns, the noontime photochemical production rate through the self-reaction of HO2 radicals was much larger than photochemical loss due to reaction with OH and photolysis, and that dry deposition is the dominant loss mechanism. Estimated dry deposition velocities varied between approx. 1 and 6 cm/s, with relatively high values observed during the day in forested regions, indicating enhanced uptake of H2O2 by vegetation. In order to reproduce the change in H2O2 mixing ratios between sunrise and midday, a variable contribution from transport (10-100 %) is required to balance net photochemical production and deposition loss. Transport is most likely related to entrainment from the residual layer above the nocturnal boundary layer during the growth of the boundary layer in the morning.

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Atmospheric H2O2 measurement and modeling campaign during summer 2004 in Zagreb, Croatia

Cited by 13 publications

References 31 publications

Trends of ambient fine particles and major chemical components in the Pearl River Delta region: Observation at a regional background site in fall and winter

Trends of ambient fine particles and major chemical components in the Pearl River Delta region: Observation at a regional background site in fall and winter

Peroxyacetic acid in urban and rural atmosphere: concentration, feedback on PAN-NO<sub>x</sub> cycle and implication on radical chemistry

Reply to referee 1

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Atmospheric H2O2 measurement and modeling campaign during summer 2004 in Zagreb, Croatia

Cited by 13 publications

References 31 publications

Trends of ambient fine particles and major chemical components in the Pearl River Delta region: Observation at a regional background site in fall and winter

Trends of ambient fine particles and major chemical components in the Pearl River Delta region: Observation at a regional background site in fall and winter

Peroxyacetic acid in urban and rural atmosphere: concentration, feedback on PAN-NO&lt;sub&gt;x&lt;/sub&gt; cycle and implication on radical chemistry

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Peroxyacetic acid in urban and rural atmosphere: concentration, feedback on PAN-NO<sub>x</sub> cycle and implication on radical chemistry