Ozone mini-hole observed over Europe, influence of low stratospheric temperature an observations

A region of extreme low ozone values passed over North-western Europe durin g November 30, and December 1, 1999. The total ozone values were measured f rom the ground, with a Brewer Spectrophotometer, and from space with the GO ME and TOMS satellite instruments. The ozone sonde measurement and the retr ieved GOME ozone profile have shown that the main reduction in the ozone co lumn occurred between the ozone maximum (22 km) and the tropopause. The low temperatures found in the stratosphere during this event have significant consequences for the ozone retrieval algorithm, both for satellite retrieva ls and for the Brewer measurements.