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Scientific Articles - PTR-MS Bibliography

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Found 2 results
Title [ Year(Asc)]
Filters: Author is Thomas Karl  [Clear All Filters]
[1917] Emmerson, K. M., I. E. Galbally, A. B. Guenther, C. Paton-Walsh, E-A. Guerette, M. E. Cope, M. D. Keywood, S. J. Lawson, S. B. Molloy, E. Dunne, et al., "Current estimates of biogenic emissions from eucalypts uncertain for southeast Australia", Atmospheric Chemistry and Physics, vol. 16, pp. 6997–7011, jun, 2016.
<p>The biogenic emissions of isoprene and monoterpenes are one of the main drivers of atmospheric photochemistry, including oxidant and secondary organic aerosol production. In this paper, the emission rates of isoprene and monoterpenes from Australian vegetation are investigated for the first time using the Model of Emissions of Gases and Aerosols from Nature version 2.1 (MEGANv2.1); the CSIRO chemical transport model; and atmospheric observations of isoprene, monoterpenes and isoprene oxidation products (methacrolein and methyl vinyl ketone). Observations from four field campaigns during three different seasons are used, covering urban, coastal suburban and inland forest areas. The observed concentrations of isoprene and monoterpenes were of a broadly similar magnitude, which may indicate that southeast Australia holds an unusual position where neither chemical species dominates. The model results overestimate the observed atmospheric concentrations of isoprene (up to a factor of 6) and underestimate the monoterpene concentrations (up to a factor of 4). This may occur because the emission rates currently used in MEGANv2.1 for Australia are drawn mainly from young eucalypt trees (&lt; 7 years), which may emit more isoprene than adult trees. There is no single increase/decrease factor for the emissions which suits all seasons and conditions studied. There is a need for further field measurements of in situ isoprene and monoterpene emission fluxes in Australia.</p>
[1549] Karl, T., L. Kaser, and A. Turnipseed, "Eddy covariance measurements of isoprene and 232-MBO based on NO+ time-of-flight mass spectrometry", International Journal of Mass Spectrometry, vol. 365-366, pp. 15 - 19, 2014.
<div>Isoprene and 2-methyl-3-buten-2-ol (232-MBO) are the dominant</div> <div>biogenic \{VOCs\} released throughout the US, thus requiring simultaneous</div> <div>measurements. Recent measurements suggest the presence of isoprene</div> <div>in 232-MBO dominated ecosystems, however analytical difficulties</div> <div>make it problematic to detect both species independently. Based on</div> <div>a new chemical ionization scheme we use eddy covariance measurements</div> <div>to selectively measure fluxes of both species without analytical</div> <div>interference at the Manitou Experimental Forest (MEF) in Colorado.</div> <div>Our measurements show a concentration ratio between isoprene and</div> <div>232 \{MBO\} of 0.24 (ppbv/ppbv), and a flux ratio of 0.10 ([ppbv m/s]/[ppbv m/s]).</div> <div>Daytime average emission factors of isoprene and 232 \{MBO\} were</div> <div>1.4 +/- 0.3 and 16.0 +/- &nbsp;3.0 mg/m^2/h respectively.</div> <div>Both compounds exhibit light and temperature dependent fluxes. These</div> <div>findings suggest that isoprene is both locally produced and transported</div> <div>to the measurement site dominated by ponderosa pine. This makes it</div> <div>difficult to use \{MVK\} and \{MAC\} as tracers for estimating the</div> <div>photochemical age of isoprene chemistry at this site. Further our</div> <div>measurements suggest that isoprene can contribute to about 15% of</div> <div>the \{OH\} reactivity relative to 232 MBO.</div>

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Selected PTR-MS related Reviews

F. Biasioli, C. Yeretzian, F. Gasperi, T. D. Märk: PTR-MS monitoring of VOCs and BVOCs in food science and technology, Trends in Analytical Chemistry 30 (7) (2011).

J. de Gouw, C. Warneke, T. Karl, G. Eerdekens, C. van der Veen, R. Fall: Measurement of Volatile Organic Compounds in the Earth's Atmosphere using Proton-Transfer-Reaction Mass Spectrometry. Mass Spectrometry Reviews, 26 (2007), 223-257.

W. Lindinger, A. Hansel, A. Jordan: Proton-transfer-reaction mass spectrometry (PTR–MS): on-line monitoring of volatile organic compounds at pptv levels, Chem. Soc. Rev. 27 (1998), 347-375.


Lists with PTR-MS relevant publications of the University of Innsbruck can be found here: Atmospheric and indoor air chemistry, IMR, Environmental Physics and Nano-Bio-Physics


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