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| Titel |
Peroxynitric acid (HO2NO2) measurements during the UBWOS 2013 and 2014 studies using iodide ion chemical ionization mass spectrometry |
| VerfasserIn |
P. R. Veres, J. M. Roberts, R. J. Wild, P. M. Edwards, S. S. Brown, T. S. Bates, P. K. Quinn, J. E. Johnson, R. J. Zamora, J. de Gouw |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 14 ; Nr. 15, no. 14 (2015-07-23), S.8101-8114 |
| Datensatznummer |
250119920
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| Publikation (Nr.) |
 copernicus.org/acp-15-8101-2015.pdf |
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| Zusammenfassung |
| In this paper laboratory work is documented establishing iodide ion chemical ionization mass spectrometry (I- CIMS) as a sensitive method for the unambiguous
detection of peroxynitric acid (HO2NO2; PNA). A dynamic
calibration source for HO2NO2, HO2, and HONO was developed
and calibrated using a novel total NOy cavity ring-down spectroscopy (CaRDS) detector.
Photochemical sources of these species were used for the calibration and
validation of the I- CIMS instrument for detection of HO2NO2.
Ambient observations of HO2NO2 using I- CIMS during
the 2013 and 2014 Uintah Basin Wintertime Ozone Study (UBWOS) are presented.
Strong inversions leading to a build-up of many primary and secondary
pollutants as well as low temperatures drove daytime HO2NO2 as
high as 1.5 ppbv during the 2013 study. A comparison of HO2NO2
observations to mixing ratios predicted using a chemical box model
describing an ozone formation event observed during the 2013 wintertime
shows agreement in the daily maxima HO2NO2 mixing ratio, but a
differences of several hours in the timing of the observed maxima.
Observations of vertical gradients suggest that the ground snow surface
potentially serves as both a net sink and source of HO2NO2
depending on the time of day. Sensitivity tests using a chemical box model
indicate that the lifetime of HO2NO2 with respect to deposition
has a non-negligible impact on ozone production rates on the order of
10 %. |
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