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Twenty Questions
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71	TWENTY QUESTIONS Q9: What are the chlorine and bromine reactions that destroy stratospheric ozone? Reactive gases containing chlorine and bromine destroy stratospheric ozone in “catalytic” cycles made up of two or m Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:21:42 Ozone depletion Oxygen Chemical elements Atmosphere Ozone Chlorine monoxide Stratosphere Chlorine Catalysis Chemistry Matter Oxidizing agents
72	TWENTY-ONE QUESTIONS, AND ANSWERS, ABOUT RADIATION AND SUBSISTENCE HARVESTED BIRDS AND OTHER RESOURCES IN ALASKA Add to Reading List Source URL: www.epi.alaska.gov Language: English - Date: 2011-10-13 16:16:00 Radioactivity Health Nuclear accidents Ionizing radiation Radiation Radioactive contamination Nuclear and radiation accidents Chernobyl disaster Bird Medicine Radiobiology Nuclear physics
73	TWENTY QUESTIONS Q18: Is depletion of the ozone layer the principal cause of climate change? No, ozone depletion itself is not the principal cause of climate change. However, because ozone is a greenhouse gas, ozone cha Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:22:21 Ozone depletion Millennium Development Goals Oxygen Radiative forcing Greenhouse gas Montreal Protocol Ozone Chlorofluorocarbon Tropospheric ozone Environment Atmospheric sciences Earth
74	TWENTY QUESTIONS: 2006 UPDATE Q14: Do changes in the Sun and volcanic eruptions affect the ozone layer? Yes, factors such as changes in solar radiation, as well as the formation of stratospheric particles after volcanic Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:49:34 Ozone depletion Oxygen Atmosphere Ozone layer Ozone Volcano Mount Pinatubo Atmosphere of Earth Solar cycle Geology Earth Environment
75	TWENTY QUESTIONS Q4: Is total ozone uniform over the globe? No, the total amount of ozone above the surface of Earth varies with location on time scales that range from daily to seasonal. The variations are caused by st Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:21:16 Ozone depletion Atmosphere Oxygen Ozone layer Ozone Dobson unit Stratosphere Atmosphere of Earth Scientific Assessment of Ozone Depletion Atmospheric sciences Earth Environment
76	TWENTY QUESTIONS Q20: When is the ozone layer expected to recover? The ozone layer is expected to recover by the middle of the 21st century, assuming global compliance with the Montreal Protocol. Chlorine- and bromine-c Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:22:28 Earth Oxygen Millennium Development Goals Greenhouse gases Ozone layer Ozone Montreal Protocol Chlorofluorocarbon Nitrous oxide Environment Ozone depletion Chemistry
77	TWENTY QUESTIONS: 2006 UPDATE Q4: Is total ozone uniform over the globe? No, the total amount of ozone above the surface of Earth varies with location on time scales that range from daily to seasonal and longer. The var Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:42:04 Ozone depletion Atmosphere Oxygen Ozone layer Ozone Dobson unit Stratosphere Atmosphere of Earth Scientific Assessment of Ozone Depletion Earth Atmospheric sciences Environment
78	TWENTY QUESTIONS: 2006 UPDATE Q7: What emissions from human activities lead to ozone depletion? Certain industrial processes and consumer products result in the emission of “halogen source gases” to the atmosphere. Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:45:26 Greenhouse gases Oxidizing agents Refrigerants Organofluorides Ozone layer Chlorofluorocarbon Montreal Protocol Ozone 1 1 2-Trichloro-1 2 2-trifluoroethane Chemistry Environment Ozone depletion
79	TWENTY QUESTIONS: 2006 UPDATE Q2: How is ozone formed in the atmosphere? Ozone is formed throughout the atmosphere in multistep chemical processes that require sunlight. In the stratosphere, the process begins with an o Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2007-03-27 17:41:02 Earth Ozone depletion Atmosphere Oxidizing agents Environmental chemistry Ozone layer Ozone Tropospheric ozone Stratosphere Chemistry Environment Oxygen
80	TWENTY QUESTIONS Q3: Why do we care about atmospheric ozone? Ozone in the stratosphere absorbs some of the Sun’s biologically harmful ultraviolet radiation. Because of this beneficial role, stratospheric ozone is cons Add to Reading List Source URL: www.esrl.noaa.gov Language: English - Date: 2006-01-21 00:21:12 Ozone depletion Oxygen Atmosphere Ozone layer Ozone Ultraviolet Tropospheric ozone Stratosphere Sunlight Environment Earth Atmospheric sciences

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