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The diagram shows recent atmospheric ozone concentrations above Antarctica - HSC - SSCE Chemistry - Question 28 - 2006 - Paper 1
Question 28
The diagram shows recent atmospheric ozone concentrations above Antarctica. Explain how this information was obtained, and outline the changes that have occurred in... show full transcript
Worked Solution & Example Answer:The diagram shows recent atmospheric ozone concentrations above Antarctica - HSC - SSCE Chemistry - Question 28 - 2006 - Paper 1
Step 1
Explain how this information was obtained
Answer
The information on atmospheric ozone concentrations above Antarctica was obtained through satellite measurements and ground-based monitoring stations. Satellites equipped with spectrometers detect the levels of ozone by analyzing the light spectrum reflected off the Earth's atmosphere. This data helps in identifying the concentration of ozone in different regions and altitudes.
Step 2
Outline the changes that have occurred in atmospheric ozone concentrations above Antarctica during the past twenty years
Answer
Over the past twenty years, atmospheric ozone concentrations above Antarctica have experienced significant changes primarily due to the impact of human activities on the environment. During the late 20th century, ozone depletion was severe, largely attributed to chlorofluorocarbons (CFCs) and other ozone-depleting substances. However, recent data indicates some recovery in ozone levels, attributed to international agreements like the Montreal Protocol, which phased out the use of CFCs. Despite this recovery, it remains a gradual process, and full restoration of the ozone layer is still projected to take several decades.