Showing papers by "Michael E. Jenkin published in 2011"
TL;DR: In this article, a tropical rainforest located in Danum Valley, Borneo, Malaysia, a high isoprene emission region, was studied during Summer 2008 using Aerosol Mass Spectrometry and offline detailed characterisation using comprehensive two dimensional gas chromatography.
Abstract: . Isoprene is the most abundant non-methane biogenic volatile organic compound (BVOC), but the processes governing secondary organic aerosol (SOA) formation from isoprene oxidation are only beginning to become understood and selective quantification of the atmospheric particulate burden remains difficult. Organic aerosol above a tropical rainforest located in Danum Valley, Borneo, Malaysia, a high isoprene emission region, was studied during Summer 2008 using Aerosol Mass Spectrometry and offline detailed characterisation using comprehensive two dimensional gas chromatography. Observations indicate that a substantial fraction (up to 15% by mass) of atmospheric sub-micron organic aerosol was observed as methylfuran (MF) after thermal desorption. This observation was associated with the simultaneous measurements of established gas-phase isoprene oxidation products methylvinylketone (MVK) and methacrolein (MACR). Observations of MF were also made during experimental chamber oxidation of isoprene. Positive matrix factorisation of the AMS organic mass spectral time series produced a robust factor which accounts for an average of 23% (0.18 μg m−3), reaching as much as 53% (0.50 μg m−3) of the total oraganic loading, identified by (and highly correlated with) a strong MF signal. Assuming that this factor is generally representative of isoprene SOA, isoprene derived aerosol plays a significant role in the region. Comparisons with measurements from other studies suggest this type of isoprene SOA plays a role in other isoprene dominated environments, albeit with varying significance.
140 citations
TL;DR: A secondary organic aerosol (SOA) code, coupled with the reduced Common Representative Intermediates chemical mechanism (CRI v2-R5), has been used in the global 3-D chemistry-transport model, STOCHEM, to simulate the global distribution of OA mass loadings.
54 citations
01 Jan 2011
TL;DR: In this paper, the main focus of the chapter is at the European scale; however, both local variability and and intercontinental N • r transfers are also addressed, and a description of the diff erent model types is provided.
Abstract: Approaches Modelling provides a way of estimating atmospheric transport and deposition of N • r at the European scale. A description of the diff erent model types is provided. Current deposition estimates from models are compared with observations from European air chemistry monitoring networks. • Th e main focus of the chapter is at the European scale; however, both local variability and and intercontinental N • r transfers are also addressed.
41 citations
TL;DR: In this article, the rate coefficient for HO2+NO2 was measured using a turbulent flow technique with high pressure chemical ionization mass spectrometry for the detection of reactants.
14 citations