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Sensitivity of stomatal conductance to soil moisture: Implications for tropospheric ozone

TitleSensitivity of stomatal conductance to soil moisture: Implications for tropospheric ozone
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2018
AuthorsAnav, A., Proietti C., Menut L., Carnicelli S., De Marco Alessandra, and Paoletti E.
JournalAtmospheric Chemistry and Physics
Volume18
Pagination5747-5763
ISSN16807316
KeywordsAtmospheric chemistry, dry deposition, Europe, Ozone, parameterization, Risk assessment, Sensitivity analysis, Soil moisture, Stomatal conductance, troposphere, water stress
Abstract

Soil moisture and water stress play a pivotal role in regulating stomatal behaviour of plants; however, in the last decade, the role of water availability has often been neglected in atmospheric chemistry modelling studies as well as in integrated risk assessments, despite the fact that plants remove a large amount of atmospheric compounds from the lower troposphere through stomata.

The main aim of this study is to evaluate, within the chemistry transport model CHIMERE, the effect of soil water limitation on stomatal conductance and assess the resulting changes in atmospheric chemistry testing various hypotheses of water uptake by plants in the rooting zone.

Results highlight how dry deposition significantly declines when soil moisture is used to regulate the stomatal opening, mainly in the semi-arid environments: in particular, over Europe the amount of ozone removed by dry deposition in one year without considering any soil water limitation to stomatal conductance is about 8.5TgO3, while using a dynamic layer that ensures that plants maximize the water uptake from soil, we found a reduction of about 10% in the amount of ozone removed by dry deposition ( ∼ 7.7TgO3). Although dry deposition occurs from the top of canopy to ground level, it affects the concentration of gases remaining in the lower atmosphere, with a significant impact on ozone concentration (up to 4ppb) extending from the surface to the upper troposphere (up to 650hPa).

Our results shed light on the importance of improving the parameterizations of processes occurring at plant level (i.e. from the soil to the canopy) as they have significant implications for concentration of gases in the lower troposphere and resulting risk assessments for vegetation or human health. © Author(s) 2018.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85045956245&doi=10.5194%2facp-18-5747-2018&partnerID=40&md5=5d4c360eae7c5a914a7fbc7ab11ad2ea
DOI10.5194/acp-18-5747-2018
Citation KeyAnav20185747