 |
| Titel |
Airborne hydrogen cyanide measurements using a chemical ionisation mass spectrometer for the plume identification of biomass burning forest fires |
| VerfasserIn |
M. Breton, A. Bacak, J. B. A. Muller, S. J. O'Shea, P. Xiao, M. N. R. Ashfold, M. C. Cooke, R. Batt, D. E. Shallcross, D. E. Oram, G. Förster, S. J.-B. Bauguitte, P. I. Palmer, M. Parrington, A. C. Lewis, J. D. Lee, C. J. Percival |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 18 ; Nr. 13, no. 18 (2013-09-16), S.9217-9232 |
| Datensatznummer |
250085697
|
| Publikation (Nr.) |
 copernicus.org/acp-13-9217-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
A chemical ionisation mass spectrometer (CIMS) was developed for measuring
hydrogen cyanide (HCN) from biomass burning events in Canada using I−
reagent ions on board the FAAM BAe-146 research aircraft during the BORTAS
campaign in 2011. The ionisation scheme enabled highly sensitive
measurements at 1 Hz frequency through biomass burning plumes in the
troposphere.
A strong correlation between the HCN, carbon monoxide (CO) and acetonitrile
(CH3CN) was observed, indicating the potential of HCN as a biomass
burning (BB) marker. A plume was defined as being 6 standard deviations
above background for the flights. This method was compared with a number of
alternative plume-defining techniques employing CO and CH3CN
measurements. The 6-sigma technique produced the highest R2 values for
correlations with CO. A normalised excess mixing ratio (NEMR) of 3.68 ± 0.149 pptv ppbv−1
was calculated, which is within the
range quoted in previous research (Hornbrook et al., 2011). The global
tropospheric model STOCHEM-CRI incorporated both the observed ratio and
extreme ratios derived from other studies to generate global emission totals
of HCN via biomass burning. Using the ratio derived from this work, the
emission total for HCN from BB was 0.92 Tg (N) yr−1. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|