| 夏季东亚阻塞高压形成维持的波数域动能分析 |
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| 引用本文： | 张培忠.夏季东亚阻塞高压形成维持的波数域动能分析[J].应用气象学报,1998,9(3):298-303. |
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| 作者姓名： | 张培忠 |
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| 作者单位： | 1.内蒙古气象科学研究所 |
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| 基金项目： | 国家自然科学基金会,内蒙古气象局“内蒙西部夏季异常干旱的成因分析”课题 |
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| 摘 要： | 用波数域动能方程分析了1986年夏季东亚阻塞高压的形成、维持和衰退过程。发现该夏季代表阻塞高压的波动是5波（长波），而不是2波（超长波）。在阻高形成和维持阶段，波与波非线性相互作用向5波输送动能，使5波动能增大；而波与平均流的相互作用则使5波动能减小。在阻高维持阶段，有效位能向5波转换动能，维持阻高。波与平均流的相互作用却使5波维持。在阻高衰退阶段则完全相反，波与波相互作用项以及有效位能与动能转换项均为负值，使5波动能变小，阻高衰退。而波与平均流相互作用，却使高纬西风减小，有利阻高维持。
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| 关 键 词： | 阻塞高压 波数域 动能方程 5波动能 |
Kinetic Energy Analyses of the Formation and Maintenance Processes of East Asian Blocking High in Summer |
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| Affiliation: | (Inner Mongolia Research Institute of Meteorological Sciences, Hohhot 010051) |
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| Abstract: | The formation, maintenance and decay processes of blocking high over East Asia in summer of 1986 are analysed by kinetic energy equations with various wave-number domains. It is found that the representative wave number of blocking high is wave-number 5 in the case, which is in the long wave domain, not wave-number 2. During the formation and maintenance stages of blocking episodes, the kinetic energy at wave-number 5 increases through the wave-wave nonlinear interaction and decreases through the wave-mean flow interaction. During the maintenance stage, the available poteneial energy at wave-number 5 is transformed into kinetic energy as to maintain the blocking. These physical processes are reversed in the decay stage, but the wave-mean flow interaction leads to the decreasing of westerlies in the high latitude, and maintaining the blocking high. |
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| Keywords: | Blocking high Wave-number domain Kinetic energy equation Kinetic energy at wave-number 5 |
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