Seasonal variations of MLT tides revealed by a meteor radar chain based on Hough mode decomposition
Seasonal variations of MLT tides revealed by a meteor radar chain based on Hough mode decomposition
复制标题
基于霍夫模式分解的流星雷达链揭示的MLT潮汐季节变化
DOI：
10.1002/2015ja021276
复制
发表时间：
2015-08
影响因子：
2.8
通讯作者：
Liu, Libo
中科院分区：
文献类型：
--
作者：
Zhang, Yun;Hu, Lianhuan;Ning, Baiqi;Liu, Libo
基于霍夫模式分解，通过流星雷达链的风观测研究了中层和低层热层中不同潮汐的季节变化。首先，观测到的风被分解为不同的（日间、半日间和昼间）潮汐分量。每个组成部分都揭示了不同的季节模式。显着的半年振荡（SAO）出现在日成分中，而依赖于纬度的季节变化则出现在半日成分和昼成分中。在低/中纬度站，半年/年振荡相对较强。然后，利用霍夫模态分解来提取每个分解分量的主要潮汐模态。研究发现，每个分量都由其对称潮汐模态之一主导，具有很强的季节性依赖性。在主 (1, 1) 模式下观察到明显的 SAO； （2、4）模态在秋冬月份（九月春分以后）较强。基于提取的结果，我们进一步绘制了每个潮汐分量的三维分布（纬度 × 海拔 × 季节）。最后将测绘结果与热层电离层中间层能量学和动力学多普勒干涉仪（TIDI）观测到的相应值进行比较，并根据全球尺度波模型（GSWM）进行建模。每个绘制的潮汐分量与季节变化中相应的 TIDI 观测结果非常吻合。同时，映射值与GSWM模型结果之间的日分量的季节依赖性存在重合，而半日分量的季节依赖性存在差异。
Seasonal variations of different tides in the mesosphere and lower thermosphere are investigated from wind observations of a meteor radar chain on the basis of Hough mode decomposition. First, the observed winds are decomposed into different (diurnal, semidiurnal, and terdiurnal) tidal components. Different seasonal patterns are revealed for each component. Pronounced semiannual oscillation (SAO) is presented in the diurnal component, while latitude‐dependent seasonal variation is found in the semidiurnal and terdiurnal components. At the low/midlatitude stations, the semiannual/annual oscillation is relatively stronger. Then, Hough mode decomposition is utilized to extract the dominant tidal modes of each decomposed component. It is found that each component is dominated by one of its symmetric tidal modes with strong seasonal dependency. Apparent SAO is observed in the dominant (1, 1) mode; (2, 4) mode is strong in the autumn and winter months (after the September equinox). Based on the extracted results we further map the three‐dimensional distribution (latitude × altitude × season) of each tidal component. The mapped results are finally compared with the corresponding values observed by the Thermosphere Ionosphere Mesosphere Energetics and Dynamics Doppler Interferometer (TIDI) and modeled from the global scale wave model (GSWM). Each mapped tidal component agrees well with corresponding TIDI observation in the seasonal variation. Meanwhile, coincidences are found in the seasonal dependency of the diurnal component between the mapped values and the modeled results from GSWM, while difference between them exists in that of the semidiurnal one.
登录
查看更多内容
影响因子：
1.9
作者：
L. Guo;G. Lehmacher
通讯作者：
L. Guo;G. Lehmacher
DOI：
10.1590/s0102-261x2007000600009
发表时间：
2007
期刊：
--
影响因子：
--
作者：
A. S. Tokumoto;P. Batista;B. Clemesha
通讯作者：
A. S. Tokumoto;P. Batista;B. Clemesha
影响因子：
--
作者：
C. McLandress;G. Shepherd;B. Solheim
通讯作者：
C. McLandress;G. Shepherd;B. Solheim
影响因子：
--
作者：
J. Friedman;Xiaolin Zhang;X. Chu;J. Forbes
通讯作者：
J. Friedman;Xiaolin Zhang;X. Chu;J. Forbes
影响因子：
--
作者：
P. Mukhtarov;D. Pancheva;B. Andonov
通讯作者：
P. Mukhtarov;D. Pancheva;B. Andonov