Discussion
Which tracer is used to estimate the age of stratospheric air?
Answer: C
Long lived tracers whose tropospheric concentration is increasing steadily provide a clock: the lag between a stratospheric measurement and the matching tropospheric value gives the mean transit time. Ages of up to six years are found at high latitudes. Ozone is chemically active, water vapour is modified by the cold trap, and nitrous oxide is destroyed rather than produced in the stratosphere. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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