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The Ozone Hole Reaches South America

 


The Ozone hole reached land and population areas in Argentina, Chile and The
Falkland Islands on September 25-28 , October 9, 16-19,  and November 17-20
2011.

 


Ozone levels are down as much as 40% in some areas. The protective level of
ozone has dropped below  200 dobson units in some areas.

 


Several hundred thousand people live in the area reached by The Ozone Hole.

 


The expected high temperatures in the next few days will be in the high 40s(9
centigrade) with cloudy skies, due to its cold and windy climate, people spend a
lot of time indoors and are unlikely to venture out with bare arms and legs.

 


If it becomes sunny the public still should take precautions and avoid going
outside during the peak hours of 11:00 a.m. and 3:00 p.m. to avoid exposure to
the UV rays. If people do go outside during these hours they should wear
protective sunscreen and if possible a hat or head covering and sunglasses with
a uv rating.

 

 


The ozone layer in the upper atmosphere is the key filter for damaging
ultraviolet-B (UV-B) radiation in the Sun’s rays. Without it, organisms suffer
extensive DNA damage, which in humans results in a greater increase in the risk
of skin cancer, eye cataracts and defects in the body’s immune system.

 


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http://exp-studies.tor.ec.gc.ca/cgi-bin/selectMap?lang=e

 


At 53 degrees south latitude, Punta Arenas is one of the world’s southernmost
cities, sitting on the Straits of Magellan only 900 miles from Antarctica.


Population


  • Rio Grande  Argentina 55,000 


  • Ushuaia Argentina 39,000


  • Rio Gallegos Argentina 79,000


  • Puerto Natales Chile 16,000 


  • Punta Arenas  Chile139,000


  • Puerto Williams Chile 2,000


  • Falkland islands 3,100

The total ozone maps are based on ground-based measurements available from
the World Ozone and
Ultraviolet Radiation Data Centre
. Preliminary near real-time data
from ground-based observations were also used for the most recent maps.
Total ozone values are given in
Dobson Units
. The numbers represent observations taken from ground
stations situated at the bottom left corner of the number.

Maps of deviations represent total ozone deviations
from the
1978-1988 level
estimated using Total
Ozone Mapping Spectrometer (TOMS)
data for all areas except the Antarctic
and from the pre-1980 level estimated using Dobson data over the Antarctic.

Over areas with poor data coverage adjustments are
made according to TOMS on Nimbus-7,
Meteor-3, ADEOS and Earth Probe satellites. Over the polar night area Dobson and
Brewer moon observations and/or
NOAA’s TIROS Operational Vertical Sounder (TOVS)
satellite data are used.
TOVS data are also used when the more reliable TOMS data are not available. The
mapping algorithm is similar to those used by the
WMO Ozone Mapping Centre
.