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> Working with other scientists, Lin developed a model to represent how flowing air carries these substances. The new model divided the atmosphere into cells or boxes and used computer code based on the laws of physics to simulate how air and chemical substances move through each cell and around the globe.

> The model paid close attention to conserving energy, mass and momentum in the atmosphere in each box. This precision resulted in dramatic improvements in the accuracy and realism of the atmospheric chemistry.

Global Forecast System > Future https://en.wikipedia.org/wiki/Global_Forecast_System#Future

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