CAS GE 100 Lecture Notes - Lecture 17: Ozone Depletion, Sunburn
14 May 2016
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Document Summary
1974 rowland and molina hypothesized cfc"s could destroy ozone layer (1986, evidence showed 40% less ozone above south pole) Troposphere keeps all of our water vapor and warms that part of the atmosphere. Stratosphere is very cold (good for o3: 90% ozone in stratosphere, formed by solar energy, o2 + solar energy>>> o + o >>> o + o2 >>> o3. Dobson units (du) measures o3 (300 du of ozone) Most ozone formed near equator b/c of solar radiation and distributed by air circulation. Normal concentration of o3 is 300 du: holes have 220 less du than 300. Cfcs destroying o3 is a positive feedback loop. Odd nitrogen is the disproved theory that the variation of solar activity and. Ozone hole allows uvb radiation to penetrate: uvb causes skin cancer and sunburn, uvb only partially blocked by clouds and fog, has most energy and causes most damage, intensifies in the summer with higher elevations.
