Biomass burning plume chemistry: OH-radical-initiated oxidation of 3-penten-2-one and its main oxidation product 2-hydroxypropanal

Abstract. In order to enlarge our understanding of biomass burning plume chemistry, the OH-radical-initiated oxidation 3-penten-2-one (3P2), identified in emissions, and 2-hydroxypropanal (2HPr) was investigated at 298 ± 3 K 990 15 mbar two atmospheric simulation chambers using long-path FTIR spectroscopy. The rate coefficient 3P2 + OH determined be (6.2 1.0) × 10−11 cm3 molec.−1 s−1 molar first-generation yields for acetaldehyde, methyl glyoxal, 2HPr, sum peroxyacetyl nitrate (PAN) CO2, used determine CH3C(O) radical yield, were 0.39 0.07, 0.32 0.08, 0.68 0.27, 0.56 0.14, respectively, under conditions where 3P2-derived peroxy radicals react solely with NO. 2HPr reaction as a source α-hydroxyaldehyde adjusting experimental shift system towards secondary processes. estimated (2.2 0.6) s−1. Employing simple chemical mechanism analyse temporal behaviour experiments, further shown form CO2 0.27 0.73 respectively.