FURTHER OZONE DECLINE DURING THE NORTHERN-HEMISPHERE WINTER-SPRING OF 1994-1995 AND THE NEW RECORD LOW OZONE OVER SIBERIA

Ground-based total ozone observations show that during the second half of January 1995 through February, most of March, and the first week of April very low ozone values, again were observed in northern middle and high latitudes. Over Eastern and Southern Europe and North America the deficiency was 10-12% with a few periods down to 15-20%. Since mid January the ozone values fall 25% below the long-term mean over Siberia and Yakutia. This anomaly lasted on the average for twelve consecutive weeks. For a number of days in early February and in the second half of March, the deficiency exceeded 35-40%. The monthly mean lower stratosphere temperatures over Siberia, where the polar vortex was displaced were 10 degrees C below the normal for January and February falling down below -75 degrees C to -80 degrees C during the time of lowest ozone.