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| Titel |
Examination of the atmospheric conditions associated with high and low summer ozone levels in the lower troposphere over the eastern Mediterranean |
| VerfasserIn |
P. D. Kalabokas, J.-P. Cammas, V. Thouret, A. Volz-Thomas, D. Boulanger, C. C. Repapis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 20 ; Nr. 13, no. 20 (2013-10-23), S.10339-10352 |
| Datensatznummer |
250085765
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| Publikation (Nr.) |
 copernicus.org/acp-13-10339-2013.pdf |
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| Zusammenfassung |
| In order to evaluate the observed high rural ozone levels in the eastern
Mediterranean area during summertime, vertical profiles of ozone measured in
the period 1994–2008 in the framework of the MOZAIC project (Measurement of
Ozone and Water Vapor by Airbus in Service Aircraft) over the eastern
Mediterranean basin (Cairo, Tel Aviv, Heraklion, Rhodes, Antalya) were
analyzed, focusing in the lower troposphere (1.5–5 km). At first, vertical
profiles collected during extreme days with very high or very low
tropospheric ozone mixing ratios have been examined together with the
corresponding back-trajectories. Also, the average profiles of ozone,
relative humidity, carbon monoxide, temperature gradient and wind speed
corresponding to the 7% highest and the 7% lowest ozone mixing ratios
for the 1500–5000 m height layer for Cairo and Tel Aviv have been examined
and the corresponding composite maps of geopotential heights at 850 hPa have
been plotted. Based on the above analysis, it turns out that the
lower-tropospheric ozone variability over the eastern Mediterranean area is
controlled mainly by the synoptic meteorological conditions, combined with
local topographical and meteorological features. In particular, the highest
ozone concentrations in the lower troposphere and subsequently in the
boundary layer are associated with large-scale subsidence of ozone-rich air
masses from the upper troposphere under anticyclonic conditions while the
lowest ozone concentrations are associated with low pressure conditions
inducing uplifting of boundary-layer air, poor in ozone and rich in relative
humidity, to the lower troposphere. |
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