The maximum deposition amount of 3.2E+05 pg/m2 for the particle simulation was not matched by gaseous deposition (4.4E+05 pg/m2) until Henry's constant was increased to 100,000!
Rather than the 1 kg, the simulation lost 4 kg when the calculation started in precipitation region because the entire plume extent, in both the horizontal and vertical, was subjected to wet removal.