Influence of irregular temperature variations caused by gravity waves on the infrared radiative cooling/heating of the mesosphere/lower termosphere

中层和低热层区域(MLT)是连接地球环境和空间的门户。它对太阳输入的变化和低层大气的影响都非常敏感。模拟MLT在不同时间尺度上对太阳变率的反应，需要正确地考虑痕量气体分子振动带中MLT的红外辐射冷却/加热。我们提出了一个新的研究来研究MLT中由于重力波引起的小尺度不规则温度涨落而产生的辐射冷却/加热效应。现代大气环流模式不能解决这些持续的波动，但它们对MLT的辐射驱动的影响是显著的。我们的目标是开发一个重力波引起的变化的统计模型，并将其应用于对应于不同纬度和季节的大尺度温度廓线。首次编制了与忽略红外辐射计算中的不规则温度结构有关的冷热率误差的全球分布。这些分布将被用来开发用于在大气环流模式中实施的影响的参数化。

The Mesosphere and lower thermosphere region (MLT) is the gateway between the Earth`s environment and space. It is highly sensitive both to variations of the solar input and the impact from the lower atmopshere. Modelling the reaction of the MLT at various time scales to the solar variability requires correct accounting for the infrared radiative cooling/heating of the MLT in the molecular ro-vibrational bands of trace gases. We propose a novel study to investigate radiative cooling/heating effects in the MLT due to small-scale irregular temperature fluctuations caused by gravity waves. These persistent fluctuations are not resolved by modern general circulation models, but their effect on the radiative driving on the MLT is significant. We aim to develop a statistical model of gravity wave-induced variations and apply it to large-scale temperature profiles corresponding to different latitudes and seasons. For the first time, global distributions of the cooling/heating rate errors associated with the neglect of the irregular temperature structures in the infrared radiative calculations will be compiled. These distributions will be applied to develop a parameterization of the effect for implementation in general circulation models.