Annual and interannual variations in global 6.5DWs from 20 to 110 km during 2002–2016 observed by TIMED/SABER
Annual and interannual variations in global 6.5DWs from 20 to 110 km during 2002–2016 observed by TIMED/SABER
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TIMED/SABRE 观测到的 2002 年至 2016 年全球 6.5DW 在 20 至 110 公里范围内的年度和年际变化
DOI：
10.1002/2017ja023886
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
C. M. Huang
中科院分区：
文献类型：
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作者：
Huang Yingying;Zhang Shaodong;Li Chongying;Li Huijun;K. M. Huang;C. M. Huang
利用2002-2016年TIMED/SABER动力学温度资料，对52°S-52°N、20-110 km处6.5DWs的年际变化进行了研究。首先，我们得到了全球6.5DW谱功率和振幅的年变化。我们发现，强波振幅出现在25°S/N到52°S/N，并在平流层，中间层和低热层的高度达到峰值。6.5DWs的年变化在两个半球相似，但在不同高度上有所不同。在40-50公里处，年最大值主要出现在冬季。在MLT中，年峰值每半年出现两次。在80-90 km处，6.5DW主要出现在春分季节和冬季。在100-110 km处，6.5DW主要出现在春分季节。其次，我们继续研究了2002 - 2016年6.5DW振幅的年际变化。月平均振幅的频谱分析表明，6.5DW长期变化的主要动力机制是南北半球的AO和SAO。此外，在NH的MLT中观察到4个月周期信号。使用带通滤波器获得SAO和AO的振幅，并发现其随高度增加，6.5DW振幅也是如此。在两个半球，SAO和AO的相对重要性随着海拔的变化而变化。在40-50和100-110 km处，AO起主导作用，而在80-90 km处，AO比SAO弱。结果表明，6.5DWs的年际和年际变化主要是由SAO和AO的共同作用引起的。
Using version 2.0 of the TIMED/SABER kinetic temperature data, we have conducted a study on the annual and interannual variations of 6.5DWs at 20–110 km, from 52°S to 52°N for 2002–2016. First, we obtained global annual variations in the spectral power and amplitudes of 6.5DWs. We found that strong wave amplitudes emerged from 25°S/N to 52°S/N and peaked in the altitudes of the stratosphere, mesosphere, and the lower thermosphere. The annual variations in the 6.5DWs are similar in both hemispheres but different at various altitudes. At 40–50 km, the annual maxima emerge mostly in winters. In the MLT, annual peaks occurred twice every half year. At 80–90 km, 6.5DWs appeared mainly in equinoctial seasons and winters. At 100–110 km, 6.5DWs emerged mainly in equinoctial seasons. Second, we continued the study of the interannual variations in 6.5DW amplitudes from 2002 to 2016. Frequency spectra of the monthly mean amplitudes showed that main dynamics in the long-term variations of 6.5DWs were AO and SAO in both hemispheres. In addition, 4 month period signals were noticed in the MLT of the NH. The amplitudes of SAO and AO were obtained using a band-pass filter and were found to increase with altitude, as do the 6.5DW amplitudes. In both hemispheres, the relative importance of SAO and AO changes with altitude. At 40–50 and 100–110 km, AO play a dominant role, while at 80–90 km, they are weaker than SAO. Our results show that both the annual and interannual variations in 6.5DWs are mainly caused by the combined action of SAO and AO.