SPECTRAL ANALYSIS OF ATMOSPHERIC FLUCTUATIONS IN THE POLAR MESOSPHERE
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摘要: 本文分析了1987年6月23日至29日MAC/SINE国际联合观测期间SOUSYVHF雷达在Andφya探测中层大气风场起伏的功率谱。结果显示,垂直速度谱与重力波谱理论有较大差异。引入背景风场Doppler漂移并不能完全解释垂直运动谱与重力波谱理论的偏差,背景风场的影响明显小于理论预测的结果,说明大气运动功率谱成分中除了重力波外可能还有其它因素。Abstract: Observations with the mobile SOUSY VHF radar at Andφya (69°N,16°E)during the MAC /SINE campaign in the summer of 1987 are used to calculate the Vertical wavenumber spectra and frequency spectra.Vertical wavenumber spectra have slopes close to -2.70, -2.65 and-1.55 for the zonal,meridional and vertical winds,respectively. Frequency spectra have slopes close to -1.44,- 1.30 and -0.27 in the range 6h-30min periods for the three velocity components.It is found that the horizontal wind spectra are in resonable accord with the 2D turbulence theory or gravity wave spectral theory.The inconsistency of vertical wind spectra to the gravity wave spectral theory can not be explained by the Doppler-shifting effects. This shows that the spectra of atmospheric waves may consist of components other than the gravity waves.
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Key words:
- VHF radar /
- Mesospheric atmosphere /
- Power spectra
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