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The importance of diabatic heating in the Mediterranean is emphasized. Based upon a simple dynamic theory, a formula is derived for a rough estimation of divergence production due to sensible heat flux. Divergence amounts, comparable to those due to rather strong synoptic systems, can be produced by sensible heat flux in some extreme but not rare cases. On the other hand, spatial and temporal distributions of some weather elements, mainly thunderstorm frequency, constitute a strong evidence for a major importance of diabatic heating in the Mediterranean.

Measurements with a tethered sonde ozone system are used to estimate the ozone sink at the ground in a semi-urban place in northern Greece. The estimate is based on measurements of the ozone removal, mostly by chemical contact with the ground, as the stable layer forms above the ground at night. An upper limit of the estimated ozone sink during this case study amounted to 1.1 · 1011 molecules cm−2 sec−1. Air quality and meteorological data for the region are also discussed.