Journal article

Examination of the atmospheric conditions associated with high and low summer ozone levels in the lower troposphere over the eastern Mediterranean

Kalabokas P, Cammas J, Thouret V, Volz-Thomas A, Boulanger D, Repapis C ...see all

Atmospheric Chemistry and Physics, vol. 13, issue 20 (2013) pp. 10339-10352

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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 1500-5000m 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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  • P. D. Kalabokas

  • J. P. Cammas

  • V. Thouret

  • A. Volz-Thomas

  • D. Boulanger

  • C. C. Repapis

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