Vertical Transport in Atmospheres
Two decades ago, a revolutionary paper appeared, explaining the presence of O2 at heights above 100 km through the rapidity of molecular diffusion (Nicolet and Mange, 1954). Subsequent papers and reviews discussed this idea further (Mange, 1955, 1957; Nicolet, 1960). A second revolution took place some ten years later, with the formulation of a steady-state model incorporating eddy diffusion (Colegrove et al., 1965, 1966). These papers gave the first quantitative description of the upward transport of O, between 90 and 150 km. The aeronomy to today is permeated with eddy diffusion, which for many problems is a first-order effect.
KeywordsScale Height Eddy Diffusion Lower Stratosphere Vertical Transport Downward Flux
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