What is the lifetime of OH at the sea level, assuming that thefollowing reactions are the principal sinks for OH in thetroposphere. Answer in sec to two significant digits.
OH + CO → CO2 + H (1)
OH + CH4 → CH3 + H2O (2)
The density of air at the sea level is 2.69 ×1019molecules cm-3, the mixing ratios of CO andCH4 are 80 ppbv and 1700 ppbv, respectively, and thereaction rate is kCO= 1.5×10-13molecules-1 cm3 s-1 for (1) andkCH4= 2.5×10-15 molecules-1cm3 s-1 for (2).
