Is it Unprecedented Arctic Ozone Loss  or

Ozone moved out of the way by the rising polar vortex ?

Images:

http://www.nasa.gov/topics/earth/features/pia14824.html

http://eoimages.gsfc.nasa.gov/images/imagerecords/36000/36972/npole_gmao_200901-02.mov

see also: http://www.vukcevic.co.uk/NFC.htm