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| Titel |
Measurements of CH3O2NO2 in the upper troposphere |
| VerfasserIn |
B. A. Nault, C. Garland, S. E. Pusede, P. J. Wooldridge, K. Ullmann, S. R. Hall, R. C. Cohen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 2 ; Nr. 8, no. 2 (2015-02-27), S.987-997 |
| Datensatznummer |
250116147
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| Publikation (Nr.) |
 copernicus.org/amt-8-987-2015.pdf |
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| Zusammenfassung |
| Methyl peroxy nitrate (CH3O2NO2) is a non-acyl peroxy nitrate
that is important for photochemistry at low temperatures characteristic of
the upper troposphere. We report the first measurements of
CH3O2NO2, which we achieved through a new aircraft inlet
configuration, combined with thermal-dissociation laser-induced fluorescence
(TD-LIF) detection of NO2, and describe the accuracy, specificity, and
interferences to CH3O2NO2 measurements.
CH3O2NO2 is predicted to be a ubiquitous interference to
upper-tropospheric NO2 measurements. We describe an experimental
strategy for obtaining NO2 observations free of the
CH3O2NO2 interference. Using these new methods, we made
observations during two recent aircraft campaigns: the Deep Convective
Clouds and Chemistry (DC-3) and the Studies of Emissions and Atmospheric
Composition, Clouds, and Climate Coupling by Regional Surveys (SEAC4RS)
experiments. The CH3O2NO2 measurements we report have a
detection limit (S/N = 2) of 15 pptv at 1 min averaging on a background
of 200 pptv NO2 and an accuracy of ±40%. Observations are
used to constrain the interference of pernitric acid (HO2NO2) to
the CH3O2NO2 measurements, as HO2NO2 partially
decomposes (~11%) along with CH3O2NO2 in
the heated CH3O2NO2 channel used to detect
CH3O2NO2. |
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