Branch scientists write computer programs to simulate chemical and dynamical processes in the atmosphere; these are called "computer models." The simulations incorporate not only the physical laws governing atmospheric motions, but hundreds of chemical reactions as well. These models are used to predict changes in the ozone layer and to test our understanding of basic atmospheric processes. However, even with the fastest computers, these models can provide only a partial picture of the evolving chemical state of the atmosphere. A significant part of our research is focused on the development and improvement of chemical models.
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