1. Ozone depletion Gregušová Michaela Tetivová Petra

2. What is ozone?  Ozone is a gas that forms in the atmosphere when three atoms of oxygen are combined (0 3 )  Ozone is formed by complex chemical reactions between volatile organic compounds (VOCs) and nitrogen oxides (NOx).  Sunlight and hot temperature stimulate the chemical reactions. volatile nestabilní

3. Ozone Layer  The "ozone layer" is defined between about 25 and 35 km.  The ozone region has a very important role for life on Earth. It absorbs the UV-B radiation that is emitted by the Sun (UV-B: wavelengths between 280 and 320 nm).  Only ozone has this ability to efficiently absorb the UV-B. ability schopnost efficiently účinně

4. Depletion of ozone  The initial step in the depletion of stratospheric ozone by human activities is the emission of ozone-depleting gases containing chlorine and bromine at Earth ’s surface.Most of these gases accumulate in the lower atmosphere.  When exposed to ultraviolet radiation from the Sun,these halogen gases are converted to more reactive gases.  These and other reactive gases participate in “catalytic ”reaction cycles that efficiently destroy ozone. Initial počáteční expose vystavit depletion vyčerpání participate účastnit

5. Chloroflurocarbons  Chloroflurocarbons are the gas, that destroy ozone. They evolve from the spray and refrigerators.  Now is produce of flurocarbons reducing.

6. Ozone hole  The ozone hole is a well- defined, large-scale destruction of the ozone layer over Antarctica that occurs each Antarctic spring.  The word "hole" is a misnomer; the hole is really a significant thinning, or reduction in ozone concentrations, which results in the destruction of up to 70% of the ozone normally found over Antarctica. large-scale rozsáhlý misnomer nesprávný název thinning ztečování significant významný

7. Monitoring of ozone  On the all world are observatory sites in which is ozone measured. Ozone is monitored from the space too.  Ozone is evaluated by the Dobson Spectophotometer.

8. Important websites  http://www.epa.gov  http://www.noaa.gov  http://www.wmo.ch  http://asd-www.larc.nasa.gov  http://www.bom.gov.au  http://www2.nature.nps.gov/air