The tracer model employs simple decaying rates for most primary species, plus wet scavanging and dry
depostion. We can roughly derive the AVERAGE aging time for certain species based on their decaying
rates if rain and cloud are not heavy, or have low impact on these species. The presented ages can
be used ONLY as a reference, due to realistic complexity. Please note that the tracer concentrations
DO NOT represent the realistic concentration, but only as contribution from various sources.
The model layer is defined in the WRF's half-sigma coordinate and driven by WRF 50km simulation. The
model height can be approximately treated as the altitude above
surface level where the topograph does not exceed 1km above sea level.
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