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Enhanced Seasonal Variations for Chemical Rates with Inverse Temperature Dependencies: Application to Seasonal Abundance of Mesospheric Sodium

机译：具有逆温度依赖性的化学速率的季节变化增强：应用于中间层钠的季节性丰度

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摘要

For a fixed altitude, the known seasonal variations of pressure in the mesosphere are less than a factor of two. However, the components of the pressure, the total concentration and temperature, vary in opposition to each other. Thus, a rate for a process with an inverse temperature dependence can undergo a much larger seasonal variation than does the pressure. In particular, the loss rate associated with the three-body process Na + O2 + M yields NaO2 + M, which has a negative temperature dependence, annually varies by a factor of four at 80 and 85 km for 60 N and by less than a factor of two at 30 N. Using a recent sodium model, sodium concentrations for 60 N at 80 and 85 km are shown to change by factors of three and two, respectively. Other possible contributors to the seasonal variation of mesospheric sodium are argued as less important.

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