Exercise #11

Previous

Next

• Problem #1 - The previous wet deposition simulation for particles showed deposition results 10,000 times larger than for the gaseous simulation. What Henry's constant is required for a gas to match the magnitude of the particle deposition?

• Hint - Reconfigure the gaseous wet deposition simulation using a more appropriate removal constant. For example, Henry's constant for OH is about 1000 and for H2O2 it is about 10,000.

• Solution - concplot.ps

• Problem #2 - How sensitive is the wet removal to the location of the precipitation with respect to the pollutant? The particle wet deposition calculation showed only about 1 kg of mass was lost. Earlier it was mentioned that the precipitation started on the 26th at 0600 UTC. Instead of Dayton, start the particle calculation from the location of the initial wet deposition period (0600-0900) through 1500 UTC and compare the differences in the loss of mass.

• Hint - Using the results from one of the simulations in problem #1, output the deposition for each time period to determine the location of the first deposition to be about 42N 79W.

• Solution - About 4 kg lost in 9 h instead of 1 kg over 24 h because the calculation started in the precipitation region resulting in wet removal over the entire spatial extent of the pollutant.