| NUMERICAL STUDY OF OROGRAPHIC INFLUENCE ON LOW FREQUENCY OSCILLATION |
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| 作者姓名： | 张勤 朱育峰 倪允琪 林武银 |
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| 作者单位： | Nanjing Institute of Meteorology, Nanjing 210044;Nanjing Institute of Meteorology, Nanjing 210044;Department of Atmospheric Sciences, Nanjing University, Nanjing 210008;Department of Atmospheric Sciences, Nanjing University, Nanjing 210008 |
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| 摘 要： | Orographic effects on monthly-and seasonal-scale low frequency oscillation are investiged in terms of a five-level global spectral model with a triangle truncation at wavenumber 10 that contains relatively full physical parameterization, followed by analysis and comparison of the lowpass filtered data separately obtained from models with and without orography. Results show that remarkable seasonal characteristics are displayed in the orographic forcing-generated low frequency wavetrain on monthly and seasonal scales. It is found that the Northern Hemisphere summer orography-produced tropical heating acts as source of the low-frequency wavetrain for both hemispheres. Besides, the simulations indicate that the orographic wavetrain perturbation can give rise to the anomaly in the equatorial zonal flow, whose transient forcing will cause a new wavetrain in the Southern Hemisphere, thus completing the cross-equatorial propagation of the northern wave in interhemispheric action.
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| 关 键 词： | spectral model orographic influence low-frequency oscillation tropical convection |
| 收稿时间： | 1993/3/22 0:00:00 |
| 修稿时间： | 1993/12/6 0:00:00 |
NUMERICAL STUDY OF OROGRAPHIC INFLUENCE ON LOW FREQUENCY OSCILLATION |
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| Zhang Qin,Zhu Yufeng,Ni Yunqi and Lin Wuyin.NUMERICAL STUDY OF OROGRAPHIC INFLUENCE ON LOW FREQUENCY OSCILLATION[J].Journal of Tropical Meteorology,1995,1(1):67-74. |
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| Authors: | Zhang Qin Zhu Yufeng Ni Yunqi and Lin Wuyin |
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| Institution: | Nanjing Institute of Meteorology, Nanjing 210044;Nanjing Institute of Meteorology, Nanjing 210044;Department of Atmospheric Sciences, Nanjing University, Nanjing 210008;Department of Atmospheric Sciences, Nanjing University, Nanjing 210008 |
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| Abstract: | Orographic effects on monthly-and seasonal-scale low frequency oscillation are investiged in terms of a five-level global spectral model with a triangle truncation at wavenumber 10 that contains relatively full physical parameterization, followed by analysis and comparison of the lowpass filtered data separately obtained from models with and without orography. Results show that remarkable seasonal characteristics are displayed in the orographic forcing-generated low frequency wavetrain on monthly and seasonal scales. It is found that the Northern Hemisphere summer orography-produced tropical heating acts as source of the low-frequency wavetrain for both hemispheres. Besides, the simulations indicate that the orographic wavetrain perturbation can give rise to the anomaly in the equatorial zonal flow, whose transient forcing will cause a new wavetrain in the Southern Hemisphere, thus completing the cross-equatorial propagation of the northern wave in interhemispheric action. |
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| Keywords: | spectral model orographic influence low-frequency oscillation tropical convection |
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