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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
© Author(s) 2016. This work is distributed
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Research article
07 Oct 2016
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Effect of mid-term drought on Quercus pubescens BVOC emissions seasonality and their dependence to light and/or temperature
Amélie Saunier1, Elena Ormeño1, Christophe Boissard2, Henri Wortham3, Brice Temime-Roussel3, Caroline Lecareux1, Alexandre Armengaud4, and Catherine Fernandez1 1Aix Marseille Univ, Univ Avignon, CNRS, IRD, IMBE, Marseille, France
2Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
3Aix Marseille Univ, CNRS, LCE, Laboratoire de Chimie de l'Environnement, Marseille, France
4Air PACA, 146 rue Paradis, Bâtiment Le Noilly Paradis, 13294 Marseille, Cedex 06
Abstract. Biogenic volatile organic compounds (BVOC) emitted by plants are a large source of carbon compounds released into the atmosphere where they are precursors of ozone and secondary organic aerosols. Being directly involved in air pollution and indirectly in climate change, it is very important to understand what factors drive the BVOC emissions in order to characterize the atmospheric composition through models. The main algorithms currently used to predict BVOC emissions are mainly light and/or temperature dependent. Additional factors such as seasonality and drought have been also found to influence isoprene emissions, especially in Mediterranean region which is characterized by its drought period in summer. These factors are increasingly included in models but only for the principal studied BVOC which is isoprene but there are still some discrepancies in estimations of emissions. In this study, the main BVOC (isoprene, methanol, acetone, acetaldehyde, formaldehyde and MACR+MVK+ISOPOOH), emitted by Quercus pubescens a tolerant drought Mediterranean species, were monitored with a PTR-ToF-MS over an entire seasonal cycle, under both natural and amplified drought which is expected with climate change. Amplified drought impacted all BVOC by reducing emissions in spring and summer and, in the contrary, by increasing emissions in autumn. Two types of dependence were found: light and temperature dependence (isoprene, MACR+MVK+ISOPOOH and acetaldehyde), and light and temperature dependence during the day and only temperature dependence during the night (methanol, acetone and formaldehyde). Moreover, a methanol burst in early morning and formaldehyde deposition/uptake were also punctually observed which were not assessed by model.

Citation: Saunier, A., Ormeño, E., Boissard, C., Wortham, H., Temime-Roussel, B., Lecareux, C., Armengaud, A., and Fernandez, C.: Effect of mid-term drought on Quercus pubescens BVOC emissions seasonality and their dependence to light and/or temperature, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-836, in review, 2016.
Amélie Saunier et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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RC1: 'Review on Saunier et al.', Anonymous Referee #1, 10 Nov 2016 Printer-friendly Version 
AC1: 'response to reviewer 1', Amélie Saunier, 12 Dec 2016 Printer-friendly Version Supplement 
RC2: 'Reviewer 2 comments', Anonymous Referee #2, 17 Dec 2016 Printer-friendly Version 
AC2: 'response to reviewer 2', Amélie Saunier, 19 Dec 2016 Printer-friendly Version 
Amélie Saunier et al.
Amélie Saunier et al.


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Short summary
We investigated the BVOC emissions variations of Quercus Pubescens, under natural and amplified drought, in situ, in order to determine the dependence to light and/or temperature of these emissions. Our results showed that all BVOC emissions were reduced with amplified drought. Moreover, we highlighted 2 dependences: (i) light and temperature (ii) light and temperature during the day and to temperature during the night. These results can be useful to enhance emisisons models.
We investigated the BVOC emissions variations of Quercus Pubescens, under natural and amplified...