| 北半球冬季行星波的传播及其输运作用 |
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| 作者姓名： | Chen Wen Huang Ronghui |
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| 作者单位： | Chen Wen and Huang RonghuiInstitute of Atmospheric Physics，Chinese Academy of Sciences，Beijing 100080 |
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| 基金项目： | This study was supported by the National Key Programme for Developing Basic Sciences under Grant G1998040900 and by the Chinese Academy of Sciences under Grant KZCX1-10-07. |
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| 摘 要： | 利用变换欧拉平均方程讨论了行星波动力学。观测和模拟结果都表明,在北半球冬季准定常行星波的经向传播存在两支波导。一支为高纬度波导,另一支则为低纬度波导。这些结果与理论分析相当一致。通过对EP通量进一步的研究表明,平流层爆发性增温是沿高纬度波导传播的异常行星波与平均气流相互作用的结果。而热带风场的准两年周期振荡（QBO）是低纬度平流层下层大气纬向平均流的一个重要年际变化,它可以影响行星波沿低纬度波导的传播;此外,由一个行星波一平均流耦合模式模拟的结果表明,这个热带风场的变化还可以通过波流相互作用调制行星波沿高纬度波导的传播。 行星波对臭氧的输运作用在文中也进行了分析。行星波强迫出的剩余平均环流表明,耗散的行星波有强的输运作用;向北的涡动热量输送可以强迫出一个正的输运环流,其在低纬度上升并在高纬度下沉。同时研究还表明,热带风场的QBO对行星波传播的调制对输运环流也有重要影响,模式结果表明,在QBO的东风位相期间行星波引起的输运作用明显增强,其结果可用于解释平流层高纬度臭氧的年际变化。
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| 关 键 词： | 准定常行星波 波的传播 波流相互作用 输运作用 |
| 收稿时间： | 29 December 2001 |
The Propagation and Transport Effect of Planetary Waves in the Northern Hemisphere Winter |
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| Chen Wen,Huang Ronghui.The Propagation and Transport Effect of Planetary Waves in the Northern Hemisphere Winter[J].Advances in Atmospheric Sciences,2002,19(6):1113-1126. |
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| Authors: | Chen Wen and Huang Ronghui |
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| Institution: | Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Abstract: | Based on the transformed Eulerian-mean equations, the dynamics of planetary waves are discussed.Both observations and simulations indicate that in the Northern Hemisphere winter there are two waveguides for the meridional propagation of quasi-stationary planetary waves. One is the high latitude waveguide, and the other is the low latitude waveguide. These results are in good agreement with theoretical analysis. Moreover, the convergence of EP flux indicates that the stratospheric sudden warming is the result of anomalous planetary wave propagation along the high latitude waveguide and its interaction with mean flows. The tropical quasi-biennial oscillation (QBO) winds, which represent one significant variation of zonal flow in the lower stratosphere at low latitudes, can influence the low latitude waveguide of planetary wave propagation. Our results of the wave-mean flow coupled model show that these tropical winds can also modulate the high latitude waveguide significantly in the case of wave-mean flow interaction.The transport effect of planetary waves on ozone is also analyzed. The residual mean circulation forced by planetary waves indicates that there is strong transport circulation for the dissipative planetary waves.Under the forcing of northward eddy heat transport, a positive transport circulation can result which rises at low latitudes and sinks at high latitudes. At the same time, the modification of planetary wave propagation by the equatorial QBO winds is shown to have an important impact on the transport circulation. The model results indicate that the meridional transport is amplified during the easterly phase of the QBO. This mechanism may explain the interannual variability of ozone in the stratosphere at high latitudes. |
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| Keywords: | quasi-stationary planetary waves wave propagation planetary wave-mean flow interaction transport effect |
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