Comparison of simultaneous Na lidar and mesospheric nightglow temperature measurements and the effects of tides on the emission layer heights
Comparison of simultaneous Na lidar and mesospheric nightglow temperature measurements and the effects of tides on the emission layer heights
复制标题
DOI：
10.1029/2004jd005115
复制
发表时间：
2005-05
影响因子：
--
通讯作者：
Yucheng Zhao;M. Taylor;X. Chu
中科院分区：
文献类型：
--
作者：
Yucheng Zhao;M. Taylor;X. Chu
[1]作为低纬度中间层动力学长期调查的一部分，对用不同遥感技术测量的两套新的中间层温度数据集进行了详细的比较研究。作为Maui-MALT计划的一部分，使用伊利诺伊大学Na风/温度激光雷达和犹他州州立大学CEDAR中间层温度成像仪（MTM）在夏威夷毛伊岛哈雷阿卡拉火山口（20.8°N，156.2°W，海拔3000米）的山顶进行了重合观测。高品质的联合测量，在四个激光雷达运动期间，和16个晚上的数据，跨越2002年1月至2003年10月的间隔，在这里作为例子，在每个季节的观测。Na激光雷达与空军3.7米直径的可操纵望远镜连接，提供高度范围为1080 -105公里的高质量温度（和风）数据。与此同时，MTM依次对近红外OH（6，2）Meinel波段和O2（0，1）大气波段夜光辐射进行采样，以确定该区域内两个标称高度上的高度加权中间层温度。这两个夜间数据集的比较显示出非常好的协议上的点对点，以及夜间平均值的基础上，特别是当津贴的物理合理的变化，在夜间的过程中，每个夜光层的高度。该分析得出OH M（6，2）波段发射层的平均夜间高度为88.6 km，夜间变化为±3.0 km，O2（0，1）大气波段平均高度为94.4 km，夜间变化为±4.2 km。这些结果与以前的火箭、卫星和地面观测结果非常雅阁，并进一步确立了这两种互补测量技术的有效性。此外，从这项研究中推断的计算高度变化的分析表明，系统的高度降低两个发射层高达几公里，每当激光雷达数据显示出强大的昼夜或半日潮汐强迫的证据。发现高度明显下降的趋势跟踪的相位的潮汐运动提供了新的证据的潮汐（或长周期重力波）的影响的夜光层的高度变化。
[1] 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.