2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15781The authors investigate the impact of external sources on the pattern formation of concentration profiles of passive tracers in a two-dimensional shear flow. By using the pullback attractor technique for the associated nonautonomous dynamical system, it is shown that a unique time-almost periodic concentration profile exists for time-almost periodic external source.latex fileChaotic Dynamicstext