Wind Induced Composition Effects at High Latitudes
作者： H. G. Mayr , I. Harris
DOI: 10.1007/978-94-009-8417-2_3
关键词: Atmospheric circulation 、 Momentum (technical analysis) 、 Atmosphere 、 Joule heating 、 Eddy diffusion 、 Geomagnetic storm 、 Atmospheric sciences 、 Atmospheric temperature 、 Advection 、 Materials science
摘要: With the diffusive separation of upper atmosphere horizontal motions lead to differentiation in composition. Thermally driven winds effectively transport lighter and minor species from warmer toward cooler regions on globe. Due abundance atomic oxygen a back pressure develops which significantly dampens wind velocities increases temperature contrast. During summer under magnetically disturbed conditions, observed large enhancements depletions 0 He are prominent manifestations these processes at polar latitudes. As feedback mechanism, advective mass completely changes “primary” composition effects induced by eddy diffusion. Owing rotational nature EXB momentum coupling its signature is comparatively weak, clearly distinguishable Joule dissipation.
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