Stratospheric Ozone Depletion

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PSCs promote the conversion of inorganic Cl and Cl reservoir species to active Cl (Continued) • Pathway 2: HCl(g)ClNO2 (g) in the presence of N2 O5 HCl(g) HCl(s) HCl(s) + N 2 O 5 ClNO 2 + HNO 3 (s) • Pathway 3: ClONO 2 (g)HOCl (g) ClONO 2 + H 2 O (s) HOCl + HNO 3 (s) The gas phase reactions between HCl and N 2 O 5 , between ClONO 2 and H 2 O are too slow to be important.
Why PSCs promote the conversion of inorganic Cl and Cl reservoir species to active Cl? 1. PSCs concentrate the reactant molecules. 2. Formation of HNO3 is assisted by hydrogen bonding to the water molecules in the PSC particles.
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 and 12: Prediction by Chapman theory vs. Ob
Page 13 and 14: The important catalysts for stratos
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 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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