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Long-term surface ozone variability at Mt. Cimone WMO/GAW global station (2165 m a.s.l., Italy)

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Cristofanelli P., Scheel H. E., Steinbacher M., Saliba M., Azzopardi F., Ellul R., Frohlich M., Tositti L., Brattich E., Maione M., Calzolari F., Duchi R., Landi T. C., Marinoni A., Bonasoni P.,
Project Beitrag an den Unterhalt und Betrieb der Hochalpinen Forschungsstationen Jungfraujoch und Gornergrat, 2015-2017
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Original article (peer-reviewed)

Journal Atmospheric Environment
Volume (Issue) 101
Page(s) 23 - 33
Title of proceedings Atmospheric Environment
DOI 10.1016/j.atmosenv.2014.11.012

Open Access

URL http://www.sciencedirect.com/science/article/pii/S1352231014008711
Type of Open Access Publisher (Gold Open Access)

Abstract

The Mediterranean basin represents a hot spot area for short-term O-3 distribution and anthropogenic contributions to it. This is why we analysed in this work the surface O-3 variability observed at Mt. Cimone WMO/GAW global station (CMN, 44 degrees 12' N, 10 degrees 42' E, 2165 m a.s.l., Italy) from 1991 to 2011. The measurements performed at this mountain observatory represent the longest surface O-3 record at a baseline site in the Mediterranean basin. Monthly O-3 averages at CMN show a typical seasonal cycle characterised by a winter minimum and a spring - summer maxima. The shape of the mean annual variation of O-3 is well comparable with those observed at other four baseline sites in the Alps and in the Mediterranean region: Jungfraujoch - Swiss Alps, Sonnblick - Austrian Alps, Mt Krvavec- Slovenia and Giordan Lightouse - Island of Gozo, Malta. In general, O-3 levels at CMN show higher values during warm months, which is likely to be related both to vertical transport of polluted air-masses at regional and continental scales and to enhanced photochemistry. Here, we also investigate the influence of specific atmospheric processes (i.e. the occurrence of heat-waves, North Atlantic Oscillation, thermal transport of air-masses from the regional PBL and strato-spheric intrusions) in affecting O-3 variability at CMN. Overall, a significant positive (95% confidence level) linear trend in monthly O-3 mole fraction was observed over the period 1991-2011 (0.21 +/- 0.10 nmol/mol yr(-1)) while no trend (-0.02 +/- 0.12 nmol/ mol yr(-1)) was detected for the 1996-2011, when measurements were carried out by an homogeneous set-up. On a seasonal basis, a positive trend has been observed for 1996-2011 (0.34 +/- 032 nmol/mol yr(-1)) only for spring. Significant decreases of the seasonal O-3 growth-rates have been detected at CMN during 1991-2011 from winter to spring and only for summer during 1996-2011. (C) 2014 The Authors. Published by Elsevier Ltd.
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