[DOC] [TLE] Science - The Antarctic Ozone Hole [PAR] The ozone hole is formed each year in the Southern Hemisphere spring (
September-November) when there is a sharp decline (currently up to 60%) in the 
total ozone over most of Antarctica. During ... Although some ozone depletion 
also occurs in the Arctic during the Northern ... Last updated on 20 March 2008 
by Karin. [DOC] [TLE] Arctic - Why the Ozone Hole? - National Science Foundation [PAR] Why did the ozone hole develop over Antarctica, and not over Detroit or some 
other manufacturing center where chlorofluorocarbons, or CFCs, are released... [DOC] [TLE] Student's Guide - The Ozone Hole - the NSF UV Monitoring Network [PAR] The ozone hole now occurs every year in Antarctica between the months of ... 
During this time, ozone levels over most of Antarctica are reduced by about 60% 
of their ... Some of these theories included a belief that changing wind conditions 
in the ... which keeps ozone depleted air trapped over Antarctica during the 
spring,... [DOC] [TLE] The Ozone Hole [PAR] Each spring in the stratosphere over Antarctica (Spring in the southern ... As 
winter arrives, a vortex of winds develops around the pole and isolates the ... 
Over the course of two to three months, approximately 50% of the total column 
amount of ozone in the atmosphere disappears. At some levels, the losses 
approach 90%. [DOC] [TLE] History - The Ozone Hole [PAR] In fact, ozone levels drop so low in spring in the Southern Hemisphere that ... The 
hole lasts for only two months, but its timing could not be worse. ... News about 
the ozone hole that forms over Antarctica each October has spread around .... 
and this lead to some early depletion in circumpolar regions as stratospheric 
clouds... [DOC] [TLE] Why is there an ozone hole at Antarctica and not at the Arctic Circle ... [PAR] The ozone hole results from ozone-depleting chemicals (e.g. chlorofluorocarbons 
(CFCs)). ... Why does the ozone hole over Antarctica develop each year between 
late August and early October? Are there arctic .... This rapidly eats up ozone, so 
that 70 % ozone is destroyed within first few weeks of spring. Ref: U.S. EPA:... [DOC] [TLE] Annual Antarctic Ozone Hole Larger and Formed Later in 2015 | NASA [PAR] Oct 29, 2015 ... The hole in Earth's ozone layer that forms over Antarctica each September ... 
ozone hole forms during the Southern Hemisphere's late winter months of ..... are 
hints of a ragged banding eye forming in last few visible satellite pictures." ..... 
Westerly winds develop at the top of the stratosphere, and gradually... [DOC] [TLE] The Antarctic Ozone Hole - Cool Antarctica [PAR] The Antarctic ozone hole on September 24, 2006 - a new record size ... Most of 
the ozone on earth isn't on earth at all, but in the layer of the earth's atmosphere 
... trend on the Antarctic continent, this has masked to some extent the effects of 
warming ... The ozone hole builds up over the winter months, peaking at around... [DOC] [TLE] Chapter 11 Section 1 [PAR] Ozone amounts over Antarctica drop dramatically in the course of a few weeks. 
The "hole" begins to develop each August and culminates by early October, ... the 
arrival of spring in the southern hemisphere, and it subsequently disappears by... [DOC] [TLE] Polar Ozone Hole - SOEST - University of Hawaii [PAR] Why is the Ozone Hole only over the North and South Poles, and not distributed 
... to the upper atmosphere that will affect the ozone budget for some period of 
time. ... In high latitudes, sunlight goes way down in the winter months. ... up" to 
higher values over the poles during the winter and early spring in each 
hemisphere. [DOC] [TLE] STRATOSPHERIC OZONE DEPLETION - Oregon State University [PAR] You can see animations of the ozone "hole" over Antarctica here. .... but a small 
percentage reaches the stratosphere (it lasts only about 2 years in the ... They 
had first noticed a puzzling seasonal drop in O3 levels each spring since 1977. ... 
In the lower stratosphere (15-20 km

Question: The hole in this develops every spring over Antarctica & lasts for a few months
Answer: ozone layer