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Responses of mesosphere and lower thermosphere temperatures to gravity wave forcing during stratospheric sudden warming

机译：平流层突然变暖期间中层和较低热层温度对重力波强迫的响应

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摘要

We examine the responses of the mesosphere and lower thermosphere (MLT) temperatures to gravity waves (GWs) during stratospheric sudden warming (SSW) using TIMEGCM through modifying GW parameters. Our study confirms that the height of GW forcing region is mainly determined by GW amplitude and wavelength, and its vertical depth is closely tied to the spectral width of GW phase speed. The GW forcing controls the pattern and strength of residual circulation and thereby the characteristics of the MLT cooling and warming regions. The planetary wave (PW) forcing in the MLT also affects the vertical depth and magnitude of MLT temperature anomalies through further modifying the residual circulation. These PWs in MLT are likely generated in-situ by the GW forcing at high latitudes. Therefore, the mechanisms of GW controlling the MLT temperature during a SSW are directly through GW forcing and indirectly through generating PWs in-situ.
机译：我们使用TIMEGCM通过修改GW参数来检查平流层突然变暖（SSW）期间中层和较低热层（MLT）温度对重力波（GWs）的响应。我们的研究证实，GW强迫区域的高度主要由GW的振幅和波长决定，其垂直深度与GW相速度的谱宽紧密相关。 GW强迫控制残留循环的模式和强度，从而控制MLT冷却和加热区域的特征。 MLT中的行星波（PW）强迫也会通过进一步修改残留环流而影响MLT温度异常的垂直深度和大小。 MLT中的这些PW可能是由GW在高纬度强迫下原位生成的。因此，GW在SSW期间控制MLT温度的机制是直接通过GW强制，而间接是通过在原位生成PW。

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