depletion of ozone layer?

Question

use of c.f.c's, deodrants, etc cause depletion of ozone.
But 75% of world's population is in northern hemisphere then why
is ozone depletion seen over antartica

Answer 1

Neither of the two previous answers are correct. The reaction of CFC's with ozone only takes place at temperatures of -180F or colder. The only place it is that cold all the time is Antarctica. The Arctic in winter can get that cold, but not as bad or as long.

Answer 2

The ozone layer is in the upper stratosphere and lower mesosphere. Ozone is created by free atoms of oxygen joining oxygen molecules to create O3 in UV radiation with a wavelength of <240nanometres. This happens in the mesosphere. The heavier O3 molecules sink towards the earth but are broken into O2 and O by further UV radiation with a wavelenth >290nanometres. The atoms of oxygen are lighter so they rise into the mesosphere where they join with oxygen molecules and the whole process starts again. The peak of this activity is at the stratopause, the boundary between the stratosphere and the mesosphere.

Most of the ozone is produced in the tropics and is carried to higher latitudes by stratospheric winds.

The Antarctic is a continent surrounded by ocean. The Arctic is an ocean surrounded by land. This makes for very different circumstances at each pole. A circumpolar stratospheric jet stream forms round Antarctica, this is the Polar Night Vortex and occurs in the winter. This effectively cuts off the air over Antarctica from lower latitudes. Clouds develop in the stratosphere at very low temperatures, -80°C or lower, over the Antarctic poleward of the jet stream. It is in these clouds at those temperatures that chlorine combines with the free atoms of Oxygen more readily than the O2 molecules. The chlorine (often from CFCs) is also transported to the Antarctic by stratospheric winds. If no new ozone is being created over Antarctica and no new ozone can get in because of the jet stream, ozone depletion occurs and the ozone hole develops over Antarctica.

When the jet stream breaks down in spring, some of that ozone depleted air can move to lower latitudes and has been seen on occasion over southern South America and near Tasmania in southern Australia.

Answer 3

The CFC have nothing to do with it. The ozone layer is created when the solar winds collide with the earth's magnetic fields.It is also called the Van Allan Belt. The holes in the ozone layer are perfectly normal and is caused from the ionized atoms from the sun. The beta particles are attracted to the north pole and make it negative.The alfa particles are attracted to the south pole and make it positive. The alfa particle is much heaver than the beta particles and is the reason the hole in the south is so much larger.

Answer 4

The damaging chemicals that get into the air don't just stay still. It moves up and around, until it eventually moves around the entire globe.