Product study of the reaction of OH radicals with isoprene in the atmosphere simulation chamber SAPHIR

Authors: Karl, M.; Dorn, H.-P.; Holland, F.; Koppmann, R.; Poppe, D.; Rupp, L.; Schaub, A.; Wahner, A.

Source: Journal of Atmospheric Chemistry, Volume 55, Number 2, October 2006 , pp. 167-187(21)

Publisher: Springer

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Abstract:

Atmospheric oxidation of isoprene and its oxidation products methacrolein (MACR) and methyl vinyl ketone (MVK) have an important impact on the photochemical activity in the boundary layer, in particular in forested areas. The oxidation of isoprene by OH radicals was investigated in chamber experiments conducted under tropospheric conditions in the atmosphere simulation chamber <Emphasis FontCategory="SansSerif">SAPHIR</Emphasis> at the Research Center Jülich. The aim was to determine the product yield of MVK and MACR in the OH-induced isoprene oxidation and the rate constant of their reaction with OH under real atmospheric conditions. The recently published updated degradation scheme for isoprene from Geiger et al. (2003) was used to determine rate constants and product yields. The fractional yields in the isoprene peroxy radical reaction with NO were found to be 0.41±0.03 for MVK and 0.27±0.03 for MACR. The rate coefficient for MACR with OH was found to be in very good agreement with the recommended value of IUPAC Atkinson (Atkinson et al., 2005). while the rate coefficient for MVK with OH was 27% lower.

Keywords: atmosphere simulation chamber; isoprene oxidation; methacrolein; methyl vinyl ketone; OH radicals; tropospheric ozone

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s10874-006-9034-x

Publication date: 2006-10-01