CHM210H1 Lecture Notes - Lecture 4: Polar Stratospheric Cloud, Ozone Depletion, Cloo
Document Summary
Ozone (o3) a gas that is present in small concentrations throughout the atmosphere. Dobson units (du) are used to measure the total amt of atmospheric ozone lying over a point on. 1 du is equivalent to a 0. 01mm (0. 001cm) thickness of pure ozone at the density if would possess if it were brought to ground-level (1atm) pressure and 0 c temperature. Stratospheric winds transport ozone from tropical regions (where most of it is produced) toward polar regions. The closer to the equator you live, the less the total amount of ozone that protects you from. Antarctic ozone hole discovered by dr. joe c. farman in the british atlantic survey. Had been recording ozone data over this region since 1957; noticed that the total amounts of ozone each october had been gradually decreasing with each year, esp. during mid- September to mid-october (precipitous declines beginning in the late 1970s)
