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的德国航空航天中心（German Aerospace Center，DLR）下属德国遥感数据中心（German Remote Sensing Data Center，DFD），地理坐标为11.271°E、48.081°N——此处同时也是国际中层大气变化探测网络（Network for the Detection of Mesospheric Change，NDMC）的观测站点之一。
在常规观测模式下，每15秒即可获取一组光谱数据，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的区域。
该观测覆盖的波长范围可同时探测OH(3-1)的Q支与P支谱线，以及OH(4-2)的R支与Q支谱线。
转动温度通过1520 nm至1550 nm波段内的OH(3-1) P支发射谱线计算得到。
在计算夜间平均温度时，会依据每个温度样本的个体精度对夜间温度时间序列的所有数据点进行加权处理。经加权后的平均温度较未加权的算术平均值低1~2 K。
仅当有效观测时长不少于2小时时，才会计算夜间平均温度。