ReviewLecture3b_2014

Cataly7c ozone destruc7on hydroxyl radical oh oh

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Unformatted text preview: steady state assump7on: RO3 = 0, (Eqn. 1) 2k1 CO2 (Eqn 2) k2 CO CO2 CM RO = 0 k2 CO CO2 CM + k3 CO3 k3 CO3 Subtract Eq. 1 from Eq. 2: Add Eq. 1 and Eq. 2: k1 CO2 = k4 CO3 CO k4 CO3 CO = 0 k4 CO3 CO = 0 Kine7c Analysis 3 Given the following expressions k1 CO2 = k4 CO3 CO We can rearrange the equa=ons by elimina=ng CO to give Thus we can compute the ozone concentra7on rela7ve to the oxygen concentra7on In the stratosphere Al7tude: Effect on O2 CM air concentration decreases with increasing altitude temperature increases with increasing altitude higher temperature leads to higher reaction rates Steady State Ozone Concentra7on •  Some know data from experiments ka = 10 11 , kb = 10 33 , kc = 10 3 , kd = 10 15 CM = 1018 molecules/cm3 at 30 km CO3 = CO2 ✓ ka kb CM kc kd CO2 = 209, 400 ppm ◆1 / 2 = 10 (in atmosphere) CO3 = 21 ppm 4 Role of the Hydroxyl Radical •  Accounts for nearly one- half of the total ozone destruc=on in the lower atmosphere (16- 20 km) • ...
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