| 大气的内外强迫源和西风指数的变化 |
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| 引用本文： | 吴国雄.大气的内外强迫源和西风指数的变化[J].气象,1988,14(8):3-8. |
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| 作者姓名： | 吴国雄 |
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| 作者单位： | LASG，中国科学院大气物理研究所 |
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| 摘 要： | 通过波流相互作用和无加速定理的讨论以及相应的数值分析,本文介绍有关纬向平均西风变化的近期研究成果。指出西风指数随时问变化的主动原因是波动和基本气流的相互作用以及外部动量源和热源的强迫作用;其被动原因是内外源所激发的次级环流的影响。还讨论了用简化的动力模型进行西风指数长期预报的可行性问题。
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Impacts oi external and internal atmospheric forcing on the variation of westerly index |
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| Abstract: | On review of the theories of wave-mean flow interaction and non acceleration, theorem, and the corresponding numerical analyses, the dynamical mechanism of variation of westerly index is discussed. It is pointed out that the first and active causes of the time variation of westerly index are tne internal forcing induced by wave-mean flow interaction and external forcing due to the existence of sources of momentum and heat, and its second and Passive-cause is the mean meridional circulation induced by the above-mentioned internal and external forcing. The possibility of forecasting westerly index by employing highly simplified dynamic systems is also discussed. |
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