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Cause_ effect and response

VIEWS: 4 PAGES: 1

									                   We can predic t that the ozone hole will close in about 50 years.
te                        - St ra tos p h e r i c P ro ce s s e s a n d t h e i r Ro l e i n Cl i m a te’s s ci e nt i f i c co m m i t te e ch a i r P rofe s s o r A l a n O’ N e i l l.




              Cause, effect and response                                                                                                    Chain reaction
      ON May 16, 1985, the journal                over Antarctica was reported.                                                              How the ozone hole is formed above Antarctica.
      Nature published a letter                   Its extent has been closely
      revealing that the amount of                monitored from satellites and
      ozone in the stratosphere above             ground stations ever since.
      the British Antarctic Base had               The internationally binding




                                                                                                                                                     Sola
      declined steadily each spring               Montreal Protocol on
      until October, 1985.




                                                                                                                                                          r
                                                  Substances that Deplete the




                                                                                                                                                        ener
                                                  Ozone Layer followed in 1987                                                                                              r
       The scientists who made these
                                                                                                                                                                      u ato
                                                  (amended in 1990, 1992 and                                                                                       Eq




                                                                                                                                                          gy
      observations further pointed
      out that this ozone depletion               1996).                                                                                                                  Ozone creation
      coincided with an increase in the            The initial 1987 agreement was
      amount of chlorofluorocarbons,               for CFC production to be halved
      or CFCs, in the Antarctic air               by 2000. In 1990 this was                                                                                                                                                     Ozone
      during the same period.                     changed to a complete phase                                                                                                                                                   depletion
       This was the first time that                out by 2000.
      the opening of the ozone hole                                           O Stephen Lincoln                                                                                              Str                         Ice crystal
                                                                                                                                                                                                ato
                                                                                                                                                                                                    s   phe                   cloud
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                                   Links
                          B ureau of Meteorolog y
                          w w w.bom. gov. au
                          Aus t r alia A nt arc t ic D i v ision
                          w w w. aad. gov. au
                          C SIRO Marine and Atmospheric Re search
                          w w w.cmar.c siro.au




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                                                                                                                                                                                      THE ADVERTISER | PART 4 | AUGUST 2007            19
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