The Eulerian Box Model

Let us first represent this situation with a Eulerian box model enclosing the entire airshed. The concentration of SO2 over this area c, will satisfy (25.13), or in the case of a first-order reaction... 

Euleria.n Models. Of the Eulerian models, the box model is the easiest to conceptualize. The atmosphere over the modeling region is envisioned as a well-mixed box, and the evolution of pollutants in the box is calculated following conservation-of-mass principles including emissions, deposition, chemical reactions, and atmospheric mixing. 

We begin our discussion with the simplest modeling representation—the box model—and derive the governing equations in both Eulerian and Lagrangian frameworks. 

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