Splitting of atomic oxygen height profiles by eddy diffusion |
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| Institution: | 1. Center for Social and Environmental Systems Research, National Institute for Environmental Studies, Japan;2. Project Team for Risk Information on Climate Change, Japan Agency for Marine-Earth Science and Technology, Japan;1. Mangosuthu University of Technology, Faculty of Engineering, Department of Chemical Engineering, P.O. Box 12363 Jacobs, Durban Umlazi 4026, South Africa;2. Durban University of Technology, Faculty of Engineering and the Built Environment, Department of Chemical Engineering, P.O. Box 1334, Durban 4000, South Africa |
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| Abstract: | A time-dependent model of upper atmospheric composition has been used to explain the splitting of the atomic oxygen concentration height profile into two maxima. The major feature of this model is multicomponent molecular diffusion. This model of the major constituents makes it possible to obtain the wave height profiles of the atomic oxygen as a result of the smooth eddy diffusion, multicomponent molecular diffusion and photochemistry. The position of maxima of the split profiles depends very strongly on the gradient of the eddy diffusion coefficient above its maximum. The depth of the splitting increases with the gradient increase, but the splitting does not depend on the maximum value of the eddy diffusion coefficient itself. It is important to note that, in this case, the atomic oxygen concentration may be varied by a factor of 2 in the thermosphere due only to the variation of the eddy diffusion coefficient gradient above the maximum. The splitting of the atomic oxygen height profiles is reflected in the height profiles of the Herzberg band and also of the green line emissions which are a result of atomic oxygen three-body recombination. |
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