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首页> 外文期刊>Journal of Geophysical Research, D. Atmospheres: JGR >Comparison of simultaneous Na lidar and mesospheric nightglow temperature measurements and the effects of tides on the emission layer heights
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Comparison of simultaneous Na lidar and mesospheric nightglow temperature measurements and the effects of tides on the emission layer heights

机译：Na激光雷达和中层夜间夜光温度同时测量的比较以及潮汐对发射层高度的影响

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A detailed comparative study of two new mesospheric temperature data sets, measured by different remote-sensing techniques, has been performed as part of a long-term investigation of low-latitude mesospheric dynamics. Coincident observations using the University of Illinois Na wind/temperature lidar and the Utah State University CEDAR Mesospheric Temperature Mapper (MTM) were conducted from the summit of Haleakala Crater, Maui, Hawaii (20.8°N, 156.2°W, ～3000 m) as part of the Maui-MALT program. High-quality joint measurements were obtained during four lidar campaign periods, and 16 nights of data, spanning the interval January 2002 to October 2003, are presented here as example observations during each season. The Na lidar was coupled to the Air Force 3.7 m diameter steerable telescope providing exceptional quality temperature (and wind) data spanning the altitude range ～80–105 km. At the same time the MTM sequentially sampled the NIR OH (6,2) Meinel band and the O2 (0,1) Atmospheric band nightglow emissions to determine the height-weighted mesospheric temperature at two nominal altitudes within this region. Comparison of these two nocturnal data sets shows exceptionally good agreement on a point-to-point, as well as a nightly mean basis, especially when allowances were made for physically reasonable changes in height during the course of the night for each of the nightglow layers. This analysis yields mean nocturnal altitudes of 88.6 km with a nocturnal variability of ±3.0 km for the OH M (6,2) band emission layer and 94.4 km for the O2 (0,1) Atmospheric band mean altitude with a nocturnal variability of ±4.2 km. These results are in excellent accord with previous rocket, satellite and ground-based observations and further establish the validity of these two complementary measurement techniques. Furthermore, analysis of the computed height changes inferred from this study indicates a systematic decrease in altitude of both emission layers by up to several kilometers, whenever the lidar data showed evidence of strong diurnal or semidiurnal tidal forcing. The apparent downward trend in altitude was found to track the phase of the prevailing tidal motion providing new evidence for the effects of tides (or long-period gravity waves) on the height variability of the nightglow layers.
机译：作为对低纬度中层动力学长期研究的一部分，已对通过不同的遥感技术测量的两个新的中层温度数据集进行了详细的比较研究。在伊利诺伊州纳风/温度激光雷达和犹他州立大学CEDAR中层温度测绘仪（MTM）的同时观测是从夏威夷毛伊岛哈莱阿卡拉火山口的山顶（北纬20.8°，北纬166.2°，约3000 m）进行的。是Maui-MALT计划的一部分。在四个激光雷达运动期间获得了高质量的联合测量结果，在此展示了2002年1月至2003年10月之间16个晚上的数据，作为每个季节的观测实例。 Na激光雷达与空军3.7 m直径的可操纵望远镜相连，可提供跨越80至105 km高度范围的卓越质量温度（和风）数据。同时，MTM依次对NIR OH（6,2）Meinel波段和O2（0,1）大气带夜光发射进行采样，以确定该区域内两个标称高度的高度加权中层温度。这两个夜间数据集的比较显示，在点对点以及夜间均值的基础上，都表现出了非常好的一致性，尤其是当在夜间为每个夜光层对身高进行合理的物理变化补偿时。该分析得出OH M（6,2）波段发射层的夜间平均海拔高度为88.6 km，夜间变化为±3.0 km，O2（0,1）的平均夜间海拔高度为94.4 km，夜间变化为± 4.2公里这些结果与以前的火箭，卫星和地面观测非常吻合，进一步证明了这两种互补测量技术的有效性。此外，根据这项研究得出的计算出的高度变化的分析表明，每当激光雷达数据显示出强烈的昼夜或半日潮汐强迫迹象时，两个发射层的高度都会系统下降多达几公里。发现海拔的明显下降趋势可以追踪盛行的潮汐运动的相位，从而为潮汐（或长周期重力波）对夜光层高度变化的影响提供了新的证据。

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