Longitude variations of the solar semidiurnal tides in the mesosphere and lower thermosphere at low latitudes observed from ground and space
Longitude variations of the solar semidiurnal tides in the mesosphere and lower thermosphere at low latitudes observed from ground and space
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DOI：
10.1029/2009jd011763
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发表时间：
2009-06
影响因子：
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通讯作者：
J. Friedman;Xiaolin Zhang;X. Chu;J. Forbes
中科院分区：
文献类型：
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作者：
J. Friedman;Xiaolin Zhang;X. Chu;J. Forbes
[1] 我们对低纬度中层顶区域（83-103 km）夜间热结构中观测到的太阳半日潮汐的纵向变化进行了分析，重点关注两个地点：波多黎各阿雷西博（北纬 18.3°，西经 66.8°）和夏威夷毛伊岛（北纬 20.7°，西经 156.3°）。将激光雷达进行的局部观测与使用宽带发射辐射测量 (SABRE) 进行的大气探测的纵向测量相结合，并与全球尺度波模型 2002 (GSWM-02) 进行为期 6 个月的比较：1 月、4 月、5 月、7 月、8 月和 10 月。在冬春季节，激光雷达测量到的振幅大于 SABER 记录的振幅，而在夏季，振幅相似，而在秋季，激光雷达测量到的振幅小于 SABER 记录的振幅。 GSWM 幅度介于 1 月份激光雷达和 SABRE 测量值之间，与春季测量结果相当，低于夏季预测值，与秋季激光雷达测量结果一致。除 1 月外，所有月份的激光雷达和 SABRE 的相位结构都是一致的，1 月份存在较大的相移，并且阿雷西博和毛伊岛之间的最高温度局部时间不同。 GSWM 在冬春季节的相位测量结果比夏秋季节的相位测量结果更加一致。 SABRE 数据的模态分析表明 (2, 2) 霍夫模态全年都存在。冬季伴有(2, 4)模态，夏季则伴有(2, 3)模态。主要霍夫模态的这种变化可能与冬夏相位差有关。
[1] We present an analysis of longitudinal variation in the solar semidiurnal tide observed in the nocturnal thermal structure of the low-latitude mesopause region (83–103 km), with a focus on two sites: Arecibo, Puerto Rico (18.3°N, 66.8°W) and Maui, Hawaii (20.7°N, 156.3°W). Localized observations made by lidars are combined with longitudinal measurements by Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) and compared with the Global-Scale Wave Model-2002 (GSWM-02) for 6 months: January, April, May, July, August, and October. In winter-spring, lidar-measured amplitudes are larger than those recorded by SABER, whereas in summer the amplitudes are similar and in autumn the lidars observe smaller amplitudes than SABER. GSWM amplitudes are between the lidar and SABER measurements for January, are comparable to the measurements in spring, underpredict for summer, and agree with the lidars in autumn. The phase structure is consistent among lidars and SABER for all of the months except January, when there is a large phase shift, and the local time of the temperature maximum is different between Arecibo and Maui. GSWM shows better agreement with phase measurements in winter-spring than in summer-autumn. Modal analysis of the SABER data indicates that the (2, 2) Hough mode is present throughout the year. In winter, it is joined by the (2, 4) mode, while in summer it is accompanied by the (2, 3) mode. This change in the predominant Hough modes may be related to the winter-summer phase difference.