06_Ozone and Electricity_s11b (1)

06_Ozone and Electricity_s11b (1) - 1 Physics 105 Physics...

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Unformatted text preview: 1 Physics 105 Physics for Decision Makers: The Global Energy Crisis Lecture 6 Ozone and Electricity Spring 2011 Physics 105 – Spring 2011 2 Physics 105 – Spring 2011 September 11, 2010 Physics 105 – Spring 2011 NASA Video 3 Physics 105 – Spring 2011 Ozone Hole ! Largest Antarctic ozone hole ever recorded (Sept. 2006) Physics 105 – Spring 2011 4 Physics 105 – Spring 2011 Estimated Ozone Depletion ! If emissions of CFCs continued at the 1974-86 rate of ! 1 Mt/y (CFC-11 equivalent)… ! …calculations indicated 15-20% decrease in O 3 stock... ! …30-40% increase in skin cancer (of which 2.5-5% of which are fatal) ! 500,000 to 700,000 additional cancers ! 15,000 to 35,000 additional cancer deaths ! most in northern hemisphere, 20% in US ! HOW DO YOU KNOW THIS? Physics 105 – Spring 2011 Incidence of Skin Cancer v. UV-B 5 Physics 105 – Spring 2011 NASA Estimates of what would have happened without Montreal Protocols Physics 105 – Spring 2011 ! There is a lag time between emissions reduction and polar chlorine concentration because it takes some years for the lower atmospheric chlorofluorocarbons to reach the stratosphere and be broken up through action of ultraviolet solar radiation. ! The best estimate for the lifetime of CFC-11, for example, is about 50 years 6 Physics 105 – Spring 2011 Last year’s hole was the 2 nd smallest in a decade Physics 105 – Spring 2011 Ozone - Polar ! O 3 Lowest value of ozone measured each year in the ozone hole. Global average ozone is about 300 Dobson units. Before 1980 ozone less than 200 Dobson units was rarely seen. 7 Physics 105 – Spring 2011 Physics 105 – Spring 2011 Montreal Protocol ! “ Perhaps the single most successful international agreement to date has been the Montreal Protocol. "-KOF ANN¡N, ¢OR£ER Secretary General of the United Nations Page 14 8 Physics 105 – Spring 2011 CFC Production and Concentrations Physics 105 – Spring 2011 CFC’s start to decline 9 Physics 105 – Spring 2011 Ozone (temperate latitudes) Physics 105 – Spring 2011 This year’s hole was smaller Page 18 10 Physics 105 – Spring 2011 What have we learned from this? Physics 105 – Spring 2011 Cell Phones and Cancer Page 20 11 Physics 105 – Spring 2011 Do Cell Phones Cause Cancer? 1. Yes 2. No 3. Maybe Page 21 Physics 105 – Spring 2011 Electromagnetic Spectrum 12 Physics 105 – Spring 2011 Riding downhill to and from the Zoo Page 23 Physics 105 – Spring 2011 Can you ride you bike downhill to and from the Zoo? 1. Sure 2. No Way 3. Maybe Page 24 13 Physics 105 – Spring 2011 Page 25 Physics 105 – Spring 2011 Page 26 14 Physics 105 – Spring 2011 Page 27 Physics 105 – Spring 2011 Do Cell Phones Cause Cancer?...
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This note was uploaded on 02/28/2011 for the course PHYS 105 taught by Professor Staff during the Spring '08 term at Maryland.

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06_Ozone and Electricity_s11b (1) - 1 Physics 105 Physics...

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