The dynamical processes in the atmosphere and atmospheric chemistry are coupled and have an impact on each other. The heating that results from chemical constituents affect internal gravity waves. Internal gravity waves, on the other hand, influence the distribution of a chemical in the atmosphere. These effects of gravity waves and chemical heating are the focus of this thesis.

We investigate analytical solutions of different forms of the chemical transport equation. We also describe numerical methods and show numerical results for the chemical transport equation. We study the effect of gravity waves on the chemical distribution analytically and numerically. The numerical results showing the effect of gravity waves on the distribution of the chemical are consistent with the analytical observations. The wave-induced mean flow resulting from nonlinear gravity wave interactions lead to modification of the distribution of the chemical.

We consider a configuration where gravity wave equations are coupled with the chemical transport equation. We carry out linear and weakly nonlinear analytical investigations to find the effect of the chemical heating on the gravity waves. We also carry out numerical investigations for the coupled equations and show numerical results. It is found that heating due to the chemical has a significant effect on the gravity waves, especially when the chemical is centred at the critical level. These numerical results are in general agreement with the analytical observations we obtain.