Abstract

The Athens Internal Boundary Layer Experiment (ATHIBLEX) was performed in the early summer of 1989 and 1990. The aim of the campaign was to investigate the Internal Boundary Layer (IBL) over the urban Athens area under sea breeze conditions and therefore establish the associated air pollutants transport and diffusion. The study showed that due to the different IBL heights throughout a typical sea breeze day, air pollutants are transported by this mechanism and diffused in such a way that the whole of the city centre is influenced through the fumigatory process. Results are presented to show that under adverse but not intense synoptic weather conditions, the sea breeze circulation still exists but is confined in the Athens basin to the height of the surrounding mountains; the synoptic flow is therefore dominant aloft.

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