A study of tracer transport in the mesosphere and lower thermosphere

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By using a numerical model, effects of the general circulation of the atmosphere on variation of the minor constituents of the atmosphere in the mesosphere and lower thermosphere (MLT), such as atomic oxygen and nitric oxide, were examined. Our results showed that transport processes associated with atmospheric waves played an important role on determining spatial and temporal variations of minor constituent of the atmosphere in the MLT region.These atmospheric waves were generated in the troposphere and propagated into the MLT region, so that it was shown that variations of minor constituents in the MLT region were closely related with variations of the general circulation in the tropsophere.