Question

Consider the following typical vertical profile of ozone (O3) number densities measured over the
United States. Ozone is produced in the stratosphere (10-50 km altitude) by photolysis of Oz and
subsequent combination of O atoms with Oz (chapter 10). The stratospheric Olayer protects life
on Earth by absorbing solar UV radiation and preventing this radiation from reaching the Earth's
surface. Fortunately, the O3 layer is not in contact with the Earth's surface; inhalation of Oz is toxic
to humans and plants, and the U.S. Environmental Protection Agency (EPA) has presently an air
quality standard of 80 ppbv Oz not to be exceeded in surface air. (Note: ppbv or parts per billion
volume = 1x10-9 mol/mol)
z. km
Oz profile
piecewise linear
approximation
40
—
0 1 2 3 4 $
Oz. 1012 molecules em
1 Calculate the mixing ratio of O3 at the peak of the O: layer (z = 25 km; P = 35 hPa; T = 220 K).
Would this mixing ratio be in violation of the EPA air quality standard if it were found in surface
air? (Note: we like to have a lot of Oz in the stratosphere, but not near the surface)
2. Calculate the mixing ratio of Oz in surface air (z = 0 km; P = 1000 hPa; T = 300 K). Is it in
compliance with the EPA air quality standard?
Notice that the relative decrease in mixing ratio between 25 km and the surface is considerably
larger than the relative decrease in number density. Why so?​

Answer 1

Answer:

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Explanation:

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