2. (4 pts total) Ammonia (NH3), nitrous oxide (N₂O) and methane (CH4) comprise 1 x 10-8, 3 x 10-5 and 7 x 10-5 % by mass of the Earth's atmosphere, respectively. If these compounds are removed from the atmosphere at rates of 5 x 10¹0, 1 x 10¹0 and 4 x 10¹1 kg yr¹, respectively, what are the lifetimes of NH3, N2O and CH4 in the atmosphere? What do your results imply about the spatial distribution of each of these compounds (in other words: are their concentrations likely to be uniform or variable over city, state, or the continent)? Why?

Fig: 1