Eddy diffusion in the upper atmosphere by global deposition of meteoroids

Details Eddy diffusion in the upper atmosphere by global deposition of meteoroids Eddy diffusion in the upper atmosphere by global deposition of meteoroids

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..39..133m&link_type=abstract

Astrophysics and Space Science, vol. 39, Jan. 1976, p. 133-150.

Astronomy and Astrophysics

Astrophysics

1

Angular Momentum, Atmospheric Turbulence, Meteoroids, Turbulent Diffusion, Upper Atmosphere, Atmospheric Heating, Diffusion Coefficient, Heat Transfer, Particle Interactions

Scientific paper

A theory for the production of eddy diffusion in the upper atmosphere by the global deposition of meteoroids is presented. It is based on the assumption that meteoroids falling on the earth carry, on the average, a greater amount of orbital angular momentum per unit mass than that corresponding to the earth's orbit. This excess orbital angular momentum of the meteoroids is deposited in some form or other during their interaction with the atmosphere. The softer material deposits the excess angular momentum in a region slightly higher than the harder material and is held responsible for the superrotation observed in the atmosphere. It is shown that the other population of meteoroids (metallic in nature) deposits the excess orbital angular momentum below 100-km altitude and produces eddies. The size and velocity of the eddies so formed give a value of the vertical eddy-diffusion coefficient in agreement with the upper limit set by Johnson and Wilkins (1965) from the study of downward heat transport in the atmosphere.

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