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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >IMPLICATIONS OF VARIATIONS IN THE 15-MU-M CO2 BAND COOLING IN THE MESOSPHERE AND LOWER THERMOSPHERE ASSOCIATED WITH CURRENT CLIMATOLOGIES OF THE ATOMIC OXYGEN MIXING RATIO
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IMPLICATIONS OF VARIATIONS IN THE 15-MU-M CO2 BAND COOLING IN THE MESOSPHERE AND LOWER THERMOSPHERE ASSOCIATED WITH CURRENT CLIMATOLOGIES OF THE ATOMIC OXYGEN MIXING RATIO

机译：原子氧混合比的当前气候相关的中层和下层热层中15-MU-M CO2带冷却变化的含义

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Higher values for the deactivation rate constant, k(O), for collisions CO2(01(1)0)-O have gained acceptance recently. As a result, in the mesosphere and lower thermosphere, the latitude and height structure of the CO2 cooling is significantly modified, and the sensitivity of this cooling to variations in the atomic oxygen mixing ratio is increased. The magnitude of these effects depends on the value of k(O) chosen. Results are presented which illustrate the tendencies in the structure of the CO2 cooling as the rate constant is varied, so that its impact on atmospheric modeling may be discerned and possible constraints investigated. The latitudinal variability of the sensitivity of the cooling rate to variations in atomic oxygen is also examined. The latitudinal variation in heating rate for current climatological models of atomic oxygen, associated with the new rate constants, has a small but non negligible effect on the large-scale circulation. Latitudinal variations in the oxygen mixing ratio result in changes in the residual circulation by about 20% relative to calculations with a single vertical profile of the atomic oxygen mixing ratio. Use of the larger rate constants does not result in significant changes to the latitudinal gradients in the temperature field and hence to the zonal winds. The sensitivity of the local heating rate to variations in the atomic oxygen mixing ratio shows a strong latitudinal variation. The sensitivity is greatest over the summer pole and least over the winter pole. The summer pole is the region most likely to exhibit the constituent-driven convective processes mentioned by Ward and Fomichev (1993). [References: 34]
机译：碰撞CO2（01（1）0）-O的失活速率常数k（O）的更高值最近得到了接受。结果，在中间层和较低的热层中，CO 2冷却的纬度和高度结构被显着改变，并且该冷却对原子氧混合比的变化的敏感性增加。这些影响的大小取决于所选k（O）的值。结果表明，随着速率常数的变化，CO2冷却的结构趋于变化，因此可以看出其对大气模型的影响，并研究了可能的限制条件。还检查了冷却速率对原子氧变化敏感性的纬度变化。当前的原子氧气候模型的加热速率的纬度变化与新的速率常数相关，对大规模循环的影响很小但不可忽略。相对于原子氧混合比的单个垂直分布的计算，氧混合比的纬度变化导致残留循环的变化约20％。使用较大的速率常数不会导致温度场中的纬度梯度发生显着变化，从而也不会导致纬向风发生显着变化。局部加热速率对原子氧混合比变化的敏感性显示出很强的横向变化。灵敏度在夏季极点上最大，而在冬季极点上最小。 Ward和Fomichev（1993）提到，夏季极是最有可能出现由成分驱动的对流过程的区域。 [参考：34]

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