This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.1029/2001JD001096 in citations.
Please use the identifier: http://hdl.handle.net/2128/20615 in citations.
Hydrogen peroxide, organic peroxides, carbonyl compounds, and organic acids measured at Pabstthum during BERLIOZ
Hydrogen peroxide, organic peroxides, carbonyl compounds, and organic acids measured at Pabstthum during BERLIOZ
Gas-phase H2O2, organic peroxides, carbonyl compounds, and carboxylic acids were measured from mid-July to early August 1998 during the Berlin ozone (BERLIOZ) campaign in Pabstthum, Germany. The rural site, located 50 km northwest from Berlin, was chosen to measure the pollutants downwind during a s...
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Personal Name(s): | Grossmann, D. |
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Moortgat, G. K. / Kibler, M. / Schlomski, S. / Bächmann, K. / Alicke, B. / Geyer, A. / Platt, U. / Hammer, M. / Vogel, B. / Mihelcic, D. / Hofzumahaus, A. / Holland, F. / Volz-Thomas, A. | |
Contributing Institute: |
Troposphäre; ICG-II |
Published in: | Journal of Geophysical Research Journal of geophysical research / Atmospheres, 108 (2003) S. D4 |
Imprint: |
Washington, DC
Union
2003
|
Physical Description: |
D4 |
DOI: |
10.1029/2001JD001096 |
Document Type: |
Journal Article |
Research Program: |
Chemie und Dynamik der Geo-Biosphäre |
Series Title: |
Journal of Geophysical Research D: Atmospheres
108 |
Subject (ZB): | |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/20615 in citations.
Gas-phase H2O2, organic peroxides, carbonyl compounds, and carboxylic acids were measured from mid-July to early August 1998 during the Berlin ozone (BERLIOZ) campaign in Pabstthum, Germany. The rural site, located 50 km northwest from Berlin, was chosen to measure the pollutants downwind during a summer smog episode. The hydroperoxides showed pronounced diurnal variations with peak mixing ratios in the early afternoon. The maximum mixing ratios were 1.4 ppbv (H2O2), 0.64 ppbv ( methylhydroperoxide), and 0.22 ppbv (hydroxymethyl-hydroperoxide). H2O2 was formed through photochemical activity, but originated also from vertical transport from air residing above the local inversion layer in the morning hours. Sometimes a second maximum was observed in the late afternoon-evening: This H2O2 might be formed from ozonolysis of biogenic alkenes. Ratios of H2O2/HNO3 were used as indicators for the determination of NOx-sensitive versus volatile organic compound (VOC)-sensitive regimes for photochemical production of ozone. Diurnal profiles were measured for alkanals (C-2-C-10), showing maximum mixing ratios decreased from C-2 (0.6 ppbv) to C-5 (0.1 ppbv) alkanals, which originate primarily from anthropogenic hydrocarbon degradation processes. However, higher C-6, C-9, and C-10 alkanals show strong fluctuations (0.25, 0.17, and 0.13 ppbv, respectively), showing evidence of biogenic emissions. Both primary unsaturated carbonyl ( methyl vinyl ketone, methacrolein) and secondary oxidation products of isoprene ( hydroxyacetone and glycolaldehyde, up to 0.16 and 0.20 ppbv, respectively) showed excellent correlation. Diurnal profiles of glyoxal, methylglyoxal, biacetyl, benzaldehyde, and pinonaldehyde were also obtained. Formaldehyde was measured continuously by long-path DOAS and by an instrument based on the "Hantzsch" reaction; however, mixing ratios measured by DOAS (maximum 7.7 ppbv) were systematically larger by a factor of 1.3 on average, but by a factor of 1.7 during high photochemical activity. Homologous series of monocarboxylic acids were determined: Formic and acetic acid varied between 0.6 and 3.0 ppbv. The mixing ratio of the other dropped from 0.1 to 0.2 ppbv for C-3 to typical 0.01 to 0.03 ppbv for C-6, and from 0.01 to 0.002 ppbv for C-7 to C-9 monocarboxylic acids. |