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Climate 2017, 5(4), 78; doi:10.3390/cli5040078

The Uncertain Role of Biogenic VOC for Boundary-Layer Ozone Concentration: Example Investigation of Emissions from Two Forest Types with a Box Model

1
Chair of Tree Physiology, Albert Ludwig University, Georges-Koehler-Allee 053, D-79110 Freiburg i.Br., Germany
2
Chair of Forestry Economics and Forest Planning, Albert Ludwig University, Tennenbacher Str. 4, D-79106 Freiburg i. Br., Germany
3
Department of Land, Environment, Agriculture and Forestry, University of Padova, Agripolis, Viale dell’Università 16, I-35020 Legnaro (PD), Italy
4
UMR LERFoB, AgroParisTech, INRA, 54000 Nancy, France
*
Author to whom correspondence should be addressed.
Received: 18 August 2017 / Revised: 13 September 2017 / Accepted: 28 September 2017 / Published: 6 October 2017
(This article belongs to the Special Issue Modeling Interactions Among Atmosphere, Hydrosphere, and Biosphere)
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Abstract

High levels of air pollution including ground level ozone significantly reduce humans’ life expectancy and cause forest damage and decreased tree growth. The French Vosges and the German Black Forest are regions well-known for having the highest tropospheric ozone concentrations at remote forested sites in Central Europe. This box model study investigates the sensitivity of atmospheric chemistry calculations of derived ozone on differently resolved forest tree composition and volatile organic compound emissions. Representative conditions were chosen for the Upper Rhine area including the Alsatian Vosges/France and the Black Forest/Germany during summer. This study aims to answer the following question: What level of input detail for Alsace and Black Forest tree mixtures is required to accurately simulate ozone formation? While the French forest in Alsace—e.g., in the Vosges—emits isoprene to a substantially higher extent than the forest at the German site, total monoterpene emissions at the two sites are rather similar. However, the individual monoterpene structures, and therefore their reactivity, differs. This causes a higher ozone production rate for Vosges forest mixture conditions than for Black Forest tree mixtures at identical NOx levels, with the difference increasing with temperature. The difference in ozone formation is analyzed in detail and the short-comings of reduced descriptions are discussed. The outcome serves as a to-do-list to allow accurate future ozone predictions influenced by the climate adaptation of forests and the change in forest species composition. View Full-Text
Keywords: tropospheric ozone pollution; influence of tree mixture; forest; BVOC emissions tropospheric ozone pollution; influence of tree mixture; forest; BVOC emissions
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bonn, B.; Kreuzwieser, J.; Sander, F.; Yousefpour, R.; Baggio, T.; Adewale, O. The Uncertain Role of Biogenic VOC for Boundary-Layer Ozone Concentration: Example Investigation of Emissions from Two Forest Types with a Box Model. Climate 2017, 5, 78.

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