Our campaign in winter 1999/2000 took place within the framework of THESEO 2000.
Our measurements were carried out at the IRF (Swedish Institute of Space Physics)
at Kiruna (67.9°N, 20.41°O, 425 m MSL).
For more informations about THESEO 2000 click here.
Ozone volume mixing ratio at 475 K level from December 1999 to April 2000.
The red curve is a 10 day's average, the green curve
is the potential vorticity at 475 K over Kiruna (ECMWF data).
Ozone loss from January to March 2000 due to man-made ozone
depleting substances is approx. 1.2 ppmv or over 40%.