Airglow spectrometers, as they are operated within the Network for the Detection of Mesospheric Change (NDMC; https://ndmc.dlr.de, last access: 1 November 2020), for example, allow the derivation of rotational temperatures which are equivalent to the kinetic temperature, local thermodynamic equilibrium provided. Temperature variations at the height of the airglow layer are, amongst others, caused by gravity waves. However, airglow spectrometers do not deliver vertically resolved temperature information. This is an obstacle for the calculation of the density of gravity wave potential energy from these measurements. As Wüst et al. (2016) showed, the density of wave potential energy can be estimated from data of OH^∗-airglow spectrometers if co-located TIMED-SABER (Thermosphere Ionosphere Mesosphere Energetics Dynamics, Sounding of the Atmosphere using Broadband Emission Radiometry) measurements are available, since they allow the calculation of the Brunt–Väisälä frequency. If co-located measurements are not available, a climatology of the Brunt–Väisälä frequency is an alternative. Based on 17 years of TIMED-SABER temperature data (2002–2018), such a climatology is provided here for the OH^∗-airglow layer height and for a latitudinal longitudinal grid of $\mathrm{10}{}^{\circ }\times \mathrm{20}{}^{\circ }$ at midlatitudes and low latitudes. Additionally, climatologies of height and thickness of the OH^∗-airglow layer are calculated.

中文翻译：

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低纬和中纬度在OH ^＊气辉层高度处的Brunt–Väisälä频率变异性

例如，气辉光谱仪在中层大气变化检测网络（NDMC；https：//ndmc.dlr.de，最后访问时间：2020年11月1日）中运行，因此可以推导出等于动力学温度，提供局部热力学平衡。除其他因素外，在气辉层的高度处的温度变化是由重力波引起的。但是，气辉光谱仪无法提供垂直解析的温度信息。这是从这些测量结果计算重力波势能密度的障碍。如Wüst等。（2016）表明，波势能的密度可以从OH ^＊的数据估算-airglow光谱仪（如果位于同一位置，则可使用TIMED-SABER（热球电离层中层能动动力学，使用宽带辐射辐射测量法测大气），因为它们可以计算Brunt-Väisälä频率。如果无法在同一地点进行测量，则可以选择使用Brunt–Väisälä频率的气候。基于17年的TIMED-SABER温度数据（2002年至2018年），此处提供了OH ^*-气辉层高度和纬向纵向网格的这种气候学。$\mathrm{10}{}^{\circ }\times \mathrm{20}{}^{\circ }$在中纬度和低纬度。此外，还计算了OH ^＊气辉层的高度和厚度的气候。