Stratospheric Ozone Depletion

More documents

Recommendations

Info

What influences ODP? • Lifetime in the troposphere – The more effective the tropospheric removal processes, the less of the compound that will survive to reach the stratosphere. • Altitude at which a compound is broken down in the stratosphere – <strong>Ozone</strong> is more abundant in the lower stratosphere – Substitution of F atoms for Cl atoms makes a compound break down at higher altitude less efficient in destroying O 3 . • Distribution of halogen atoms, Cl, Br, and F, contained within the molecule – Molecule for molecule, F
What controls a compound’s lifetime in the troposphere? Reaction with OH radical Lifetime in the troposphere i k OH 1 [ OH k OH reaction constant [OH] tropospheric average OH concentration ]
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 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 50 and 51: ODPs of Selected Compounds Compound

Stratospheric Ozone Depletion

Create successful ePaper yourself

Delete template?

Save as template?