Nocturnal means of OH(3-1) airglow rotational temperatures from the mesopause region obtained with GRIPS 6 located at the German Remote Sensing Data Center, Oberpfaffenhofen

The temperatures are derived from the rotational vibrational transition of the OH molecule originating from a thin layer in approximately 87 km centroid height. The spectra have been obtained with the Ground-based Infrared P-branch Spectrometer (GRIPS 6) located at the German Remote Sensing Data Center (DFD) of the German Aerospace Center (DLR) in Oberpfaffenhofen (11.271E, 48.081N), Germany - a measurement station of the international Network for the Detection of Mesospheric Change (NDMC). During routine operation one spectrum is obtained every 15 s, originating from a field of view of approximately 15.5° x 15.5° corresponding to ca. 24 x 24 km2 in 87 km height, the peak height of the OH emission layer. The covered wavelength range allows the observation of the OH(3-1) Q- and P-branches as well as of the OH(4-2) R- and Q-branches. Rotational temperatures are calculated using OH(3-1) P-branch emissions between 1520 nm and 1550 nm. For the estimation of a nocturnal mean value all samples of the nightly temperature time series are weighted according to their individual precision. Thus, mean temperatures between 1 and 2 K are lower compared to the unweighted arithmetic mean. A mean is only calculated, when at least two hours of observation time are available.

本次数据集的温度数据源自羟基（OH）分子的振转跃迁信号，信号来自质心高度约87公里的薄层大气。光谱数据由地基红外P支光谱仪（Ground-based Infrared P-branch Spectrometer，GRIPS 6）获取，该设备部署于德国奥伯法芬霍芬（地理坐标11.271°E，48.081°N），隶属于德国航空航天中心（German Aerospace Center, DLR）下属的德国遥感数据中心（German Remote Sensing Data Center, DFD），同时也是国际中层大气变化探测网（Network for the Detection of Mesospheric Change, NDMC）的观测站点之一。常规观测模式下，每15秒即可获取一条光谱，其视场约为15.5°×15.5°，对应87公里高度（即羟基发射层的峰值高度）处约24 km×24 km的观测区域。本次数据集的覆盖波段可观测到羟基（3-1）带的Q支与P支辐射，以及羟基（4-2）带的R支与Q支辐射。转动温度通过1520 nm至1550 nm波段内的羟基（3-1）带P支辐射信号计算得到。在计算夜间平均温度时，会依据每条夜间温度时序样本的个体精度进行加权平均，因此加权后的平均温度较未加权算术平均值低1~2开尔文。仅当有效观测时长不少于2小时时，方可计算平均温度。