DIABATIC ROSSBY WAVES UNDER THERMAL EFFECTS OF TIBETAN PLATEAU

Li Liming; Bai Jingyu; Huang Feng; Liu Shikuo; Wang Zhang gui

Vol.13, NO.4, 2002

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2002 > 13(4): 457-468

Li Liming, Bai Jingyu, Huang Feng, et al. Diabatic Rossby waves under thermal effects of Tibetan Plateau. J Appl Meteor Sci, 2002, 13(4): 457-468.

Citation:

Li Liming, Bai Jingyu, Huang Feng, et al. Diabatic Rossby waves under thermal effects of Tibetan Plateau. J Appl Meteor Sci, 2002, 13(4): 457-468.

Li Liming, Bai Jingyu, Huang Feng, et al. Diabatic Rossby waves under thermal effects of Tibetan Plateau. J Appl Meteor Sci, 2002, 13(4): 457-468.

Citation:

Li Liming, Bai Jingyu, Huang Feng, et al. Diabatic Rossby waves under thermal effects of Tibetan Plateau. J Appl Meteor Sci, 2002, 13(4): 457-468.

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DIABATIC ROSSBY WAVES UNDER THERMAL EFFECTS OF TIBETAN PLATEAU

1.
School of physics, Peking University, Beijing 100871
2.
Chinese Academy of Meteorological Sciences, Beijing 100081
3.
National Research Center for Marine Environment Forecast, Beijing 100081

Received Date: 2001-10-08
Rev Recd Date: 2001-12-07
Publish Date: 2002-08-31

Abstract

Abstract

From diabatic quasi-geostrophic equations of motion, the characteristics of diabatic Rossby waves under the thermal effects of the Tibetan Plateau are analyzed. When the basic zonal flow is barotropic, it is demonstrated that the cooling of the Tibetan Plateau in winter not only facilitates the meridional propagation of Rossby waves, but also is an important driving mechanism of the intraseasonal oscillations in the middle and high latitudes. The large-scale heating of the Tibetan Plateau in summer prevents Rossby waves from propagating meridionally. When the basin zonal flow is baroclinic, it is found that the cooling of the Tibetan Plateau in winter facilitates the instability of Rossby waves, while there is a threshold in the influence of the heating of the Tibetan Plateau in summer on the stability of Rossby waves.
- Diabatic Rossby wave;
- Quasi-geostrophic;
- Tibetan Plateau;
- Meridional propagation;
- low-frequency oscillation

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References(16)

Figures and Tables

图 1 简单两层模式

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图 2 不同冷却强度下经向传播条件和纬向波长的关系

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图 3 非绝热波动频率随高原热力系数和水平波长、纬向波长变化的等值线 (单位为10^-6s^-1)(a) 冬季高原冷却；(b) 夏季高原加热

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图 4 Rossby波不稳定的临界波长随高原热力系数的变化

(η>0表示夏季加热，η < 0表示冬季冷却)

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图 5 夏季不同加热强度下西风气流切变的临界值随水平波长的变化

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图 6 冬季不同冷却强度下西风气流切变的临界值随水平波长的变化

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References

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