Annual and seasonal trends of ambient ozone concentration and its impact on forest vegetation in Mercantour National Park (South-eastern France) over the 2000-2008 period |
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Authors: | Sicard Pierre Dalstein-Richier Laurence Vas Nicolas |
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Institution: | a ACRI-ST, 260 route du Pin Montard, BP 234, 06904 Sophia Antipolis cedex, Franceb G.I.E.F.S (Groupe International d’Etudes sur les Forêts Sud-européennes), 69 avenue des Hespérides, 06300 Nice, France |
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Abstract: | In the South-Eastern French Mediterranean region, high ozone concentrations were measured since many years and specific symptoms like chlorotic mottles were detected on Arolla pines. We presented results for the 2000-2008 period concerning the trend analysis for ambient ozone concentrations and related forest damages, with the Mann and seasonal Kendall tests. Ozone precursor’s emissions from Europe have been reduced over the last 20 years. Decreases in annual averages, median, 25th and 98th percentiles and maxima values were found. The seasonal trend analysis for the high-lying stations showed a decreasing trend for the warm season, when main ozone production is the photochemistry, and an increase for the cold period, caused by a reduced ozone titration. Statistics on Arolla Pine reveal strong correlations between mottling intensity and the high ozone concentrations. Finally, decreases for the ozone concentrations, and associated statistics, AOT40 values and for the mottling intensity on conifers needles were observed. |
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Keywords: | AOT40 Arolla pine Chlorotic mottle Leaf injury Mann-Kendall test Ozone Trend |
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