Isoprene contribution to ozone production under climate change conditions in the French Mediterranean area
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Isoprene contribution to ozone production under climate change conditions in the French Mediterranean area Amélie Saunier 1,2 & Elena Ormeño 1 & Damien Piga 3 & Alexandre Armengaud 3 & Christophe Boissard 4,5 & Juliette Lathière 4 & Sophie Szopa 4 & Anne-Cyrielle Genard-Zielinski 1,4 & Catherine Fernandez 4 Received: 23 March 2020 / Accepted: 13 August 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Tropospheric ozone is a strong oxidant which affects human health, agricultural yields, and ecosystem functioning. Thus, it is very important to understand what factors determine ozone formation in order to control air pollution. It is well known that isoprene participates in ozone formation. In this study, we assess the potential impact of climate change in the Mediterranean region on ozone concentration, through drought-related increase or decrease in isoprene emissions after 1 (short drought scenario—1 year of 35% annual rain restriction) and 3 (long drought scenario—3 repeated years of 35% annual restriction) years of drought stress. Using an original experimental dataset of Downy oak isoprene emissions for several drought conditions and idealized drought scenarios in a modeling framework, we showed that ozone concentrations follow the same pattern than isoprene emissions. The short drought scenario used an isoprene emission factor (which is the standardized emission rate at 30 °C and 1000 μmol m−2 s−1 of photosynthetically active radiation (PAR)) 83% higher compared with natural drought and, thus, ozone concentrations increased by 5–30 μg m−3 (3–17%). The long drought scenario used an isoprene emission factor 26% lower compared with natural drought, and ozone concentrations accordingly decreased by 1–10 μg m−3 (0.6–6%). Our results showed that ozone concentration is affected by drought intensity and duration through modification of isoprene emissions indicating that drought stress should be implemented in models (predicting the BVOC emissions). Keywords Drought . Climate change impact . Isoprene emissions . Ozone formation
Communicated by Christopher Reyer Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10113-020-01697-4) contains supplementary material, which is available to authorized users. * Amélie Saunier [email protected]
Anne-Cyrielle Genard-Zielinski [email protected] Catherine Fernandez [email protected]
Elena Ormeño [email protected] Damien Piga [email protected]
1
Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Marseille France
Alexandre Armengaud [email protected]
2
Department of Environmental and Biological Sciences, University of Eastern Finland, PO Box 1627 702511 Kuopio Finland
Christophe Boissard [email protected]
3
AtmoSud, 146 rue Paradis, Bâtiment Le Noilly Paradis, 13294 Marseille, Cedex 06 France
Juliette Lathière [email protected]
4
Laboratoire des Sciences du Climat et de l’Environnement, LSCE/IPSL, CEA
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