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| Titel |
The influence of biomass burning on the global distribution of selected non-methane organic compounds |
| VerfasserIn |
A. C. Lewis, M. J. Evans, J. R. Hopkins, S. Punjabi, K. A. Read, R. M. Purvis, S. J. Andrews, S. J. Moller, L. J. Carpenter, J. D. Lee, A. R. Rickard, P. I. Palmer, M. Parrington |
| 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 ; 13, no. 2 ; Nr. 13, no. 2 (2013-01-22), S.851-867 |
| Datensatznummer |
250017605
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| Publikation (Nr.) |
 copernicus.org/acp-13-851-2013.pdf |
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| Zusammenfassung |
| Forests fires are a significant source of chemicals to the atmosphere
including numerous non-methane organic compounds (NMOCs). We report airborne measurement of
hydrocarbons, acetone and methanol
from >500 whole air
samples collected over Eastern Canada, including interceptions of several
different boreal biomass burning plumes. From these and concurrent
measurements of carbon monoxide (CO) we derive fire emission ratios for 29
different organic species relative to the emission of CO. These range from
8.9 ± 3.2 ppt ppb−1 CO for methanol to 0.007 ± 0.004 ppt ppb−1 CO for cyclopentane. The ratios are in good to excellent
agreement with literature values. Using the GEOS-Chem global 3-D chemical
transport model (CTM) we show the influence of biomass burning on the global
distributions of benzene, toluene, ethene and propene (species which are
controlled for air quality purposes and sometimes used as indicative tracers of
anthropogenic activity). Using our observationally derived emission ratios
and the GEOS-Chem CTM, we show that biomass burning can be the largest
fractional contributor to observed benzene, toluene, ethene and propene
levels in many global locations. The widespread biomass burning contribution
to atmospheric benzene, a heavily regulated air pollutant, suggests that
pragmatic approaches are needed when setting air quality targets as tailpipe
and solvent emissions decline in developed countries. We subsequently
determine the extent to which the 28 global-status World Meteorological
Organisation – Global Atmosphere Watch stations worldwide are influenced by
biomass burning sourced benzene, toluene, ethene and propene as compared to
their exposure to anthropogenic emissions. |
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