Stratospheric Ozone Depletion

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Express ozone abundance • Total column ozone is the total amount of ozone integrated from the surface to the top of the atmosphere. • Dobson Units (DU) is used to express the total column ozone, named after G.M.B. Dobson, a scientist who conducted pioneering measurements of the stratosphere in the 1920s and 1930s. • One DU is the thickness, measured in units of hundredths of a millimeter (0.01 mm), that the ozone column would occupy at standard temperature and pressure (273 K and 1 atm)
Typical ozone column values • Total ozone column value ranges from 290 to 310 DU over the globe. • If all the atmosphere's ozone were brought down to the earth's surface at standard pressure and temperature, it would produce a layer of about 3mm thick. • <strong>Ozone</strong> depletion: when sum of ozone over height is lower than 2/3 of the normal value, we say "ozone depletion" occurs.
Page 1 and 2: Environmental Chemistry Part 2 Atmo
Page 3 and 4: The ozone layer
Page 5: Ultraviolet protection by ozone The
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 48 and 49: What influences ODP? • Lifetime i
Page 50 and 51: ODPs of Selected Compounds Compound

Stratospheric Ozone Depletion

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