On Sat, 14 May 2005 14:40:40 -0700, "Bob May"
wrote:

Why isn't there an Ozone Hole at the NORTH Pole?

The formation of the ozone hole over Antarctica is a consequence of
the special atmospheric conditions which occur there, in particularly
the very low stratospheric temperatures (below -80°C), the isolated
wind patterns and the presence of continuous sunlight after the
September equinox. Every summer (December to January) the hole repairs
itself when stratospheric temperatures rise and the air above
Antarctica mixes with the rest of the world's atmosphere. This cycle
of ozone hole formation and reparation is repeated every year. The
ozone hole over Antarctica has been forming every year since the early
1970s. In recent years the hole has become both larger and deeper, in
the sense that more and more ozone is being destroyed.

Every March to April during the Northern Hemisphere springtime
similar, but less pronounced ozone hole forms above the Arctic. The
natural circulation of wind - the polar vortex - which isolates
Antarctica from the rest of the world during the Southern Hemisphere
winter and early spring, contributing to the ozone loss there, is much
less developed in the Northern Hemisphere above the Arctic. In
addition, stratospheric temperatures there are not as low as in the
Antarctic, and consequently the loss of ozone is not as severe.
However, the formation of even a moderate ozone hole above the Arctic
region can give cause for considerable concern due to the greater
populations in the higher latitudes of the Northern Hemisphere.

http://www.ace.mmu.ac.uk/eae/Atmosph...zone_Hole.html