Stratospheric Ozone Depletion

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There must be other O 3 destruction pathways Catalytic ozone destruction Net reaction X + O 3 = XO + O 2 XO + O = X + O 2 O + O 3 = 2 O 2 X is a regenerated in the process – act as a catalyst. The chain reaction continues until X is removed by some side reaction.
The important catalysts for stratospheric O 3 destruction • Hydroxy radical (OH) . . OH + O3 = HO2 + O2 HO 2 . + O = . OH + O2 Net: O + O 3 = 2O 2 • Chlorine and bromine (Cl and Br) Cl . + O 3 = ClO . + O 2 ClO . + O = Cl . + O 2 Net: O + O 3 = 2O 2 • Nitric oxide (NO) NO + O 3 = NO 2 + O 2 NO 2 + O = NO + O 2 Net: O + O 3 = 2 O 2 HOx cycle ClOx cycle NOx cycle
Page 1 and 2: Environmental Chemistry Part 2 Atmo
Page 3 and 4: The ozone layer
Page 5 and 6: Ultraviolet protection by ozone The
Page 7 and 8: Typical ozone column values • Tot
Page 9 and 10: Ozone formation and destruction in
Page 11: Prediction by Chapman theory vs. Ob
Page 15 and 16: Chlorine atom Sources: Photolysis o
Page 17 and 18: Chlorine atom (Continued) Terminati
Page 19 and 20: The two-sided effect of NOx • NOx
Page 21 and 22: Numbering system for CFCs and HCFCs
Page 23: The discovery of the ozone hole •
Page 26 and 27: Features of the ozone hole • Ozon
Page 28 and 29: Polar vortex • The polar vortex i
Page 30 and 31: Why do PSCs occur at heights of 15-
Page 32 and 33: PSCs promote the conversion of inor
Page 34 and 35: Active Cl species can rapidly yield
Page 36 and 37: How does the polar ClOx cycle stop?
Page 38 and 39: Denitrification by PSCs enhances po
Page 40 and 41: Summary of the roles played by PSCs
Page 42 and 43: Schematic of photochemical and dyna
Page 44 and 45: Does ozone hole occur in the north
Page 46 and 47: Summary on ozone hole (Continued)
Page 48 and 49: What influences ODP? • Lifetime i
Page 50 and 51: ODPs of Selected Compounds Compound

Stratospheric Ozone Depletion

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