Photochemistry and Photochemical Reactions: The chemical reaction of two or more substances which is caused or hastened by the interaction of light on the reactants. In the atmosphere, the source of this light is the sun.
General circulation model (GCM) Numerical representation of the atmosphere and its phenomena over the entire Earth, using the equations of motion and including radiation, photochemistry, and the transfer of heat, water vapor, and momentum.
Measurements of interest include reactions in the gas phase, on surfaces and in water. Also of high importance is photochemistry which quantifies how quickly molecules are split apart by sunlight and what the products are plus thermodynamic data ...
 See also: Model, High, Earth, Water, Atmosphere
  
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