CISK kelvin wave with evaporation-wind feedback and air-sea interaction-A further study of tropical intraseasonal oscillation mechanism
CISK kelvin wave with evaporation-wind feedback and air-sea interaction-A further study of tropical intraseasonal oscillation mechanism
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DOI：
10.1007/s00376-002-0073-1
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发表时间：
2002-05
影响因子：
5.8
通讯作者：
Chongyin Li;Han‐Ru Cho;J. Wang
中科院分区：
文献类型：
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作者：
Chongyin Li;Han‐Ru Cho;J. Wang
将波浪-CISK（积云对流加热反馈）、海气相互作用和蒸发-风反馈一起引入到一个简单的理论模型中，以了解它们对驱动热带大气季节内振荡（ISO）的影响。结果表明，在引入的动力学过程中，波-CISK 在降低波的相速度以更接近观测到的热带 ISO 方面发挥着重要作用。而蒸发风反馈对波浪的不稳定起着重要作用。海气相互作用对减慢波的相速有一定的作用。因此，波浪-CISK和蒸发-风反馈可以被视为热带ISO的基本动力机制。研究还表明，由于引入了蒸发-风反馈和海气相互作用的影响，激发波具有纬向色散性，可以很好地动态解释热带大气中观测到的ISO的活动特征。
The wave-CISK (cumulus convection heating feedback), the air-sea interaction and the evaporation-wind feedback are together introduced into a simple theoretical model, in order to understand their effect on driving tropical atmospheric intraseasonal oscillation (ISO). The results showed that among the introduced dynamical processes the wave-CISK plays a major role in reducing phase speed of the wave to be closer to the observed tropical ISO. While the evaporation-wind feedback plays a major role in unstabilizing the wave. The air-sea interaction has certain effect on slowing down the phase speed of the wave. Therefore, the wave-CISK and evaporation-wind feedback can be regarded as fundamental dynamical mechanism of the tropical ISO. This study also shows that since the effects of the evaporation-wind feedback and the air-sea interaction were introduced, the excited wave is zonally dispersive, which can dynamically explain the activity feature of the observedISOin the tropical atmosphere very well.