The thickness of Earth?s ozone layer at any location is measured in Dobson Units (DU), where 1

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The thickness of Earth?s ozone layer at any location is measured in Dobson Units (DU), where 1 DU corresponds to a gas layer of thickness 10 ?m if the gas pressure were raised to 1 atm. Show that 1 DU corresponds to 2.69 ? 1016 molecules/cm2. Data on the absorption cross section for ozone are given in Figure 23.13

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Normally the thickness of the ozone layer is ? 300 DU, but due to ozone destruction by chlorofluorocarbons it had dropped as low as ? 90 DU over Antarctica during the 1990 s. How low would the ozone level have to drop to allow 10?6 of the incident UV flux at ? ? 250 nm or 220 nm to reach sea level? (You will need to use the result of Problem 23.5.)

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The Physics of Energy

ISBN: 978-1107016651

1st edition

Authors: Robert L. Jaffe, Washington Taylor

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