On the strength of the ozone sink at the ground

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.