| 地形强迫对偶极型阻塞形势的影响分析 |
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| 引用本文： | 刘春,刘自牧,叶秣麟.地形强迫对偶极型阻塞形势的影响分析[J].高原山地气象研究,2020,40(2):18-25. |
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| 作者姓名： | 刘春 刘自牧 叶秣麟 |
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| 作者单位： | 高原与盆地暴雨旱涝灾害四川省重点实验室,成都 610072;中国气象局气象干部培训学院/WMO区域培训中心,北京 100081;四川省内江市气象局,内江 641000;四川省气象局气象服务中心,成都 610072;四川省内江市气象局,内江 641000 |
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| 基金项目： | 国家自然科学资金项目(41675095、41730959) |
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| 摘 要： | 本研究运用多尺度变换和摄动法简化具有地形强迫的正压准地转涡度方程，得到带有扰动项的非线性Shr?dinger方程，在此基础上，采用孤立子直接微扰理论研究地形强迫对偶极型阻塞结构的作用。研究表明:地形强迫对偶极型阻塞发展具有增强和持续作用，其增长率与大地形山体的斜率成正比。
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| 关 键 词： | 非线性Shr?dinger方程 孤立子直接微扰理论 偶极型阻塞形势 |
| 收稿时间： | 2020-05-20 |
Analysis of the Effect of Topography Forcing on Dipole Blocking Situation |
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| Institution: | 1. Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province, Chengdu 610072, China;2. World Meteorological Organization (WMO) Regional Training Center/China Meteorological Administration Training Center, Beijing 100081, China;3. Neijiang Meteorological Bureau, Neijiang 641000, China;4. Sichuan Meteorological Service Center, Chengdu 610072, China |
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| Abstract: | In this study,the multi-scale transformation and perturbation method are used to simplify the quasi-geostrophic baratropic vorticity equation with topographic forcing. And the nonlinear Shr?dinger equation with disturbance term is obtained. On this basis,the effect of topographic forcing on the dipole blocking structure is analyzed with the soliton direct perturbation theory. The results show that topographic forcing have enhanced and sustained effect on the development of dipole-type obstructions,which growth rate is proportional to the slope of large topography. |
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