Global structure and seasonal and interannual variability of the migrating diurnal tide seen in the SABER/TIMED temperatures between 20 and 120 km
Global structure and seasonal and interannual variability of the migrating diurnal tide seen in the SABER/TIMED temperatures between 20 and 120 km
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DOI：
10.1029/2008ja013759
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发表时间：
2009-02
影响因子：
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通讯作者：
P. Mukhtarov;D. Pancheva;B. Andonov
中科院分区：
文献类型：
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作者：
P. Mukhtarov;D. Pancheva;B. Andonov
[1]本论文的重点是全球的空间（高度和纬度）结构和季节和年际变化的迁移的昼夜潮汐来自大气探测使用宽带发射辐射测量/热层-电离层-中间层-能量学和动力学（SABER/TIMED）温度测量6个完整的一年（2002年1月至2007年12月）。潮汐结果是通过一种新的分析方法获得的，其中潮汐（迁移和非迁移）和行星波（纬向传播和静止）同时提取的卫星数据。发现在70 km以上高度，SABER迁移日潮主要反映第一对称传播（1，1）模的特征，而在此高度以下，则反映第一对称俘获（1，2）模的特征。捕获的组件放大近50公里，其相位接近1600 LT。赤道的昼夜潮汐的季节性行为是占主导地位的半年变化与主要的最大值在2月至3月（18 K，平均振幅为6年）和次最大值在8月至9月（15 K）。潮汐振幅在中层/低热层迅速增长，但在1090 km附近发生衰减，形成普遍存在的双峰垂直结构。在115公里附近的高度处，振幅迅速减小;然而，在这个高度以上，日潮再次放大。在赤道上空传播的日潮的垂直波长为1020 km;在中纬度地区，它与赤道上空的日潮没有很大的不同，但其大小取决于季节。冬天比夏天长。日潮的年际变化与平流层准两年振荡有明显的相关性。
[1] The present paper is focused on the global spatial (altitude and latitude) structure and seasonal and interannual variability of the migrating diurnal tide derived from the Sounding of the Atmosphere using Broadband Emission Radiometry/Thermosphere-Ionosphere-Mesosphere-Energetics and Dynamics (SABER/TIMED) temperature measurements for 6 full years (January 2002 to December 2007). The tidal results are obtained by a new analysis method where the tides (migrating and nonmigrating) and the planetary waves (zonally traveling and stationary) are simultaneously extracted from the satellite data. It has been found that above 70 km height the SABER migrating diurnal tide reflects mainly the distinctive features of the first symmetric propagating (1,1) mode, while below this height it reflects the features of the first symmetric trapped (1,−2) mode. The trapped component amplifies near 50 km, and its phase is close to ∼1600 LT. The seasonal behavior of the diurnal tide over the equator is dominated by semiannual variation with a primary maximum in February–March (18 K, average amplitude for 6 years) and a secondary maximum in August–September (15 K). The tidal amplitude grows rapidly in the mesosphere/lower thermosphere; however, it undergoes some decay near ∼90 km, defining ubiquitous double-peaked vertical structure. A very rapid reduction in amplitude is detected at heights near 115 km; however, above this level the diurnal tide amplifies again. The vertical wavelength of the propagating diurnal tide is ∼20 km over the equator; at middle latitudes it is not very different from that over the equator, but its magnitude depends on the season. In the winter it is longer than that in summer. The interannual variability of the diurnal tide indicates a clear correlation with the stratospheric quasi-biennial oscillation.