| 重力波包在中层大气温度波导中传播的数值模拟 |
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| 引用本文： | 李俊,张绍东,易帆.重力波包在中层大气温度波导中传播的数值模拟[J].地球物理学报,2007,50(4):1030-1039. |
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| 作者姓名： | 李俊 张绍东 易帆 |
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| 作者单位： | 武汉大学电子信息学院，武汉 430079 |
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| 基金项目： | 国家自然科学基金(40336054,40504018,40575020)，长江学者和创新团队发展计划、教育部科技重点项目资金，新世纪优秀人才支持计划共同资助 |
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| 摘 要： | 给出了重力波在中层大气温度波导中的反对称形式导制传播的线性理论模型，并采用二维非线性的数值模型对重力波波包在中层大气温度波导中的传播和演变过程进行了模拟研究.模拟的结果表明，下层大气激发的重力波能量进入波导区域后被俘获形成导制传播.重力波在波导内不停地来回反射，垂直方向的自由传播受到限制，能量在波导内沿着水平方向传输，模拟得到的波参数与理论值相近.重力波包在温度波导中传播时伴随着能量泄漏，且能量泄漏的速率随时间变缓，最终总有部分能量被限制在波导区域.重力波在水平方向上传播几百公里后，依然维持着良好的波结构，同时数值模拟也给出了重力波在波导区域内能量密度的时空分布.
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| 关 键 词： | 重力波 中层大气 温度波导 数值模拟 |
| 文章编号： | 0001-5733（2007）04-1030-10 |
| 收稿时间： | 2007-1-18 |
| 修稿时间： | 2007-01-18 |
A numerical simulation on gravity waves propagation in mesospheric thermal duct |
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| LI Jun,ZHANG Shao-Dong,YI Fan.A numerical simulation on gravity waves propagation in mesospheric thermal duct[J].Chinese Journal of Geophysics,2007,50(4):1030-1039. |
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| Authors: | LI Jun ZHANG Shao-Dong YI Fan |
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| Institution: | School of Electronic Information, Wuhan University, Wuhan 430079, China |
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| Abstract: | The linear theory of antisymmetric ducted gravity waves supported by mesospheric thermal duct is presented, propagation and evolution of gravity wave packets in thermal duct is also simulated by using a nonlinear two-dimensional model. Numerical results show that lower atmospheric wave disturbance can penetrate into the duct area and be trapped. Gravity waves keep reflecting between two boundaries of the thermal duct, and wave energy is transported horizontally through the duct. Characteristics of gravity waves calculated from simulated results are little different to those derived from the linear duct theory. While wave packets propagate in the thermal duct, wave energy will be leaked. However some energy is always restricted in the duct area, for the loss rate of energy gradually decreases. Wave structures keep well after propagating horizontally for hundreds of kilometers, and evolution of the energy density distribution in the duct is also presented. |
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| Keywords: | Gravity waves Mesosphere Thermal duct Numerical simulation |
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