A series of in-situ temperature measurements performed by falling spheres at high latitudes in the last similar to 10 years is compared with historical temperature data collected by the rocket grenade technique in the mid 1960s. Concentrating on summer (here from mid May to mid August) and on altitudes between 50 and 85 km, where natural variability and instrumental uncertainties are small, the observed trend is very small, if present at all. Taking into account all data from 50 to 85 km the mean trend is -0.024 K/y with a statistical error of +/-0.014 K/y, i.e., practically zero. The mean deviation of the grenade temperatures from the falling sphere data is 0.8+/-6.4 K and the differences are randomly distributed. We have also analyzed various subsets of the entire data set, e.g., in a restricted altitude range where lidars have shown large trends at mid latitudes, namely from 55 to 75 km. The main result remains unchanged. The deviation between 'old' and 'new' data is practically zero and the temperature trend in the high latitude summer mesosphere is certainly much smaller (if any at all) compared to that observed at mid latitudes. [References: 17]
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机译：将过去约10年中高纬度坠落球进行的一系列原位温度测量与1960年代中期通过火箭榴弹技术收集的历史温度数据进行了比较。集中在夏季（这里从5月中旬到8月中旬）以及50至85 km之间的高度，那里的自然变异性和仪器不确定性很小，如果有的话，观察到的趋势很小。考虑到从50到85 km的所有数据，平均趋势为-0.024 K / y，统计误差为+/- 0.014 K / y，即几乎为零。手榴弹温度与落球数据的平均偏差为0.8 +/- 6.4 K，并且差异是随机分布的。我们还分析了整个数据集的各个子集，例如在受限的海拔范围内，其中激光雷达在中纬度（即55至75 km）处显示出较大的趋势。主要结果保持不变。与中纬度观测到的数据相比，“旧”数据与“新”数据之间的偏差实际上为零，并且高纬度夏季中间层的温度趋势肯定要小得多（如果有的话）。 [参考：17]
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