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Analysis of Summer Ozone Observations at a High Mountain Site in Central Italy (Campo Imperatore, 2388 m a.s.l.)
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Analysis of Summer Ozone Observations at a High Mountain Site in Central Italy (Campo Imperatore, 2388 m a.s.l.)
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Journal Article
Analysis of Summer Ozone Observations at a High Mountain Site in Central Italy (Campo Imperatore, 2388 m a.s.l.)
2013
Overview
Tropospheric ozone (O
3
) is an important atmospheric pollutant and climate forcer. The Mediterranean basin is a hot-spot region in terms of short-term O
3
distribution, with frequent episodes of high tropospheric O
3
, especially during summer. To improve the characterisation of summer O
3
variability in the Mediterranean area, during the period 6–27 August 2009 an experimental campaign was conducted at Campo Imperatore, Mt Portella (CMP), a high mountain site (2,388 m a.s.l.) located in the central Italian Apennines. As deduced from analysis of atmospheric circulation, the measurement site was significantly affected by air masses originating over the Mediterranean basin, which affected the measurement site for 32 % of the time. Analysis of average values and diurnal and day-to-day variability revealed that CMP O
3
observations (average value 60.0 ± 5.1 ppbv) were comparable with measurements at other European mountain stations, indicating a prevalent effect of meteorological conditions and atmospheric transport on the synoptic scale. In fact, only a small “reverse” diurnal variation typically characterises diurnal O
3
variability because of local thermal wind circulation, which sporadically favours transport of air masses rich in O
3
from the foothill regions. Statistical analysis of five-day back-trajectory ensembles indicates that synoptic-scale air-mass transport from the Mediterranean Sea usually results in decreasing O
3
concentrations at CMP, whereas the highest hourly O
3
values are mostly associated with air masses from central continental Europe, eastern Europe, and northern Italy. High O
3
concentrations are also related to downward air-mass transport from higher altitudes. Comparison of in-situ O
3
variability with tropospheric O
3
satellite-based measurements reveals similar features of the two data sets. Together with the results from back-trajectory analysis, this indicates that CMP measurements might usefully improve characterisation of broad-scale O
3
variability over the central Mediterranean basin.
Publisher
Springer Basel,Springer Nature B.V
Subject
