3. Nitric acid deposition: a) At a wind speed of 4 m s-1 over a vegetated surface, the aerodynamic resistance of nitric acid to deposition is -15 s m?, the laminar resistance is -10 s m?, and the surface resistance is 0 s m(because HNO3 is highly soluble and reactive). Use these values to estimate the dry deposition velocity of nitric acid in these conditions. How would you expect the resistance values and overall dry deposition velocity to change if wind speed increased, or if the surface were dry and barren? b) In the daytime, the mean photolysis rate of nitric acid is 3x10-53-4. Assuming a well- mixed boundary layer of 2 km thickness and 12 hours of light, what are the 24-hour- average lifetimes of nitric acid against deposition and photolysis, and the overall lifetime and fractional contributions of dry deposition and photolysis if these are the only two loss processes? If it rains every afternoon, which we can assume clears out all the nitric acid, what are the overall lifetime and fractional contributions of each process