论文部分内容阅读
利用 SOUSY VHF雷达 1 987年 6月 2 2日至 6月 2 9日在挪威 Andoya的观测数据研究了中层顶附近大气风场中行星波、潮汐和惯性重力波的非线性相互作用。首先利用 Lomb- Scargle周期图方法计算了大气纬向风场的功率谱 ,除了行星波和潮汐外 ,在行星波、潮汐的频率和与频率差处有明显的谱峰 ,双谱分析表明这些谱峰是行星波和潮汐相互作用形成的。在 86.4km处 35h行星波、半日潮与 8.9h惯性重力波有较强的非线性耦合 ,半日潮与行星波间有明显的能量传输。半日潮振幅变化的周期为 78h,远大于行星波的周期。 85.2 km处经向风场半日潮振幅的变化周期同样大于与之相互作用的 33h行星波的周期。这说明半日潮与短周期行星波的相互作用也会导致半日潮的长期变化
Using the SOUSY VHF radar observations from 22 June June to 29 June 2009 in Andoya, Norway, the nonlinear interactions of the planetary, tidal and inertial gravity waves in the wind field near the middle layer were studied. Firstly, the power spectrum of atmospheric latitudinal wind field is calculated by the Lomb-Scargle cycle diagram method. Except for the planetary wave and the tide, there are obvious peaks at the frequency and frequency difference between the planetary wave and the tidal wave. Bispectral analysis shows that these spectra Peaks are formed by the interaction of planetary waves and tides. The 35h planetary wave at 86.4km showed a strong nonlinear coupling between the semi-diurnal and 8.9h inertial gravity waves, with significant energy transfer between the semi-diurnal and planetary waves. Half-day tidal amplitude of the cycle of 78h, much larger than the cycle of the planetary wave. The period of half-tidal amplitude in the meridional wind field at 85.2 km is also greater than the period of the 33-h planetary wave with which it interacts. This shows that the interaction between the half-day tide and the short-period planetary wave also leads to the long-term change of the half-day tide