A biomass burning source of C sub(1)-C sub(4) alkyl nitrates

• Published in: Geophysical research letters Vol. 29; no. 24; pp. 21 - 1-21-4
• Main Authors: Simpson, Isobel J, Meinardi, Simone, Blake, Donald R, Blake, Nicola J, Rowland, FSherwood, Atlas, Elliot, Flocke, Frank
• Format: Journal Article
• Language: English
• Published: 01.12.2002
• Subjects: Biomass burning; Combustion; Extrapolation; Methyl nitrate; Mixing ratios; Nitrates; Radicals; Smoldering
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1029/2002GL016290

We report the first observations of the emission of five C sub(1)-C sub(4) alkyl nitrates (methyl-, ethyl-, n-propyl-, i-propyl-, and 2-butyl nitrate) from savanna burning. Average alkyl nitrate mixing ratios in the immediate vicinity of three bushfires in Northern Australia were 47-122 times higher than local background mixing ratios. These are the highest alkyl nitrate mixing ratios we have ever detected, with maximum mixing ratios exceeding 3 ppbv for methyl nitrate. Methyl nitrate dominated the alkyl nitrate emissions during the flaming stage of savanna burning, whereas C sub(2)-C sub(4) alkyl nitrates were mostly emitted during the smoldering stage. To explain the formation of alkyl nitrates from biomass burning, we propose a reaction mechanism involving the combination of reactive radicals at high temperature. Bearing in mind the uncertainties associated with extrapolating small data sets to much larger scales, alkyl nitrate emissions from global savanna burning are estimated to be on the order of 8 Gg/yr.