class15_w08

class15_w08 - How much ozone(O3 overhead Vertical...

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How much ozone (O 3 ) overhead??
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Vertical Distribution of Ozone STRATOSPHERE (defined by temperature trends) TROPOSPHERE
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Electromagnetic spectrum UVC: (250 – 290 nm) most biologically damaging, absorbed in upper atmosphere UVB: 290 – 320 nm UVA : 320 – 380 nm; reaches Earth’s surface – sunburn! shorter wavelengths = higher energy = more biologically damaging Ozone absorbs in the UVB and UVC parts of the UV region UVC: <200 – 280 nm most biologically damaging, absorbed by O 2 , O 3 , N 2 UVB: 280 – 320 nm, partly absorbed by O 3 UVA : 320 – 400 nm; mostly reaches Earth’s surface – sunburn! shorter wavelengths = higher energy = more biologically damaging
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UV absorption by O 3
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Total effect of absorption by O 2 , O 3 , other gases: in the troposphere there is little radiation at wavelengths <300 nm I/I o at 300 nm ~ 0.01
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Effects of enhanced UV Radiation Human Health Skin cancer (melanoma and non-melanoma) Skin damage and premature aging - Cataracts and other eye damage - Immune suppression Note that skin cancer rates are higher at lower latitudes – why?
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This note was uploaded on 08/06/2008 for the course CHEM 123 taught by Professor Perona during the Winter '08 term at UCSB.

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class15_w08 - How much ozone(O3 overhead Vertical...

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