Mathematical Foundation
Atmospheric transport can be looked at as a Lagrangian transport model. In such case, the footprint is the area of cumulative contribution to flux measurement computed from analytical solutions of the diffusion equation. For example, for near-neutral conditions, following Schuepp et al. (1990) and Gash (1986), the mathematical representation of footprint would be that seen in Figure 2.
Read more about this topic: Flux Footprint
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