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| Titel |
Oxygenated compounds in aged biomass burning plumes over the Eastern Mediterranean: evidence for strong secondary production of methanol and acetone |
| VerfasserIn |
R. Holzinger, J. Williams, G. Salisbury, T. Klüpfel, M. Reus, M. Traub, P. J. Crutzen  , J. Lelieveld |
| 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 ; 5, no. 1 ; Nr. 5, no. 1 (2005-01-17), S.39-46 |
| Datensatznummer |
250002204
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| Publikation (Nr.) |
 copernicus.org/acp-5-39-2005.pdf |
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| Zusammenfassung |
| Airborne measurements of acetone, methanol, PAN, acetonitrile (by Proton
Transfer Reaction Mass Spectrometry), and CO (by Tunable Diode Laser
Absorption Spectroscopy) have been performed during the Mediterranean
Intensive Oxidants Study (MINOS August 2001). We have identified ten biomass
burning plumes from strongly elevated acetonitrile mixing ratios. The
characteristic biomass burning signatures obtained from these plumes reveal
secondary production of acetone and methanol, while CO photochemically
declines in the plumes. Mean excess mixing ratios - normalized to CO - of
1.8%, 0.20%, 3.8%, and 0.65% for acetone, acetonitrile,
methanol, and PAN, respectively, were found. By scaling to an assumed global
annual source of 663-807Tg CO, biomass burning emissions of 25-31 and 29-35
Tg/yr for acetone and methanol are estimated, respectively. Our measurements
suggest that the present biomass burning contributions of acetone and
methanol are significantly underestimated due to the neglect of secondary
formation within the plume. Median acetonitrile mixing ratios throughout the
troposphere were around 150pmol/mol, in accord with current biomass burning
inventories and an atmospheric lifetime of ~6 months. |
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