Abstract
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 observed ISO in the tropical atmosphere very well.
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Li, C., Cho, HR. & Wang, JT. CISK kelvin wave with evaporation-wind feedback and air-sea interaction-A further study of tropical intraseasonal oscillation mechanism. Adv. Atmos. Sci. 19, 379–390 (2002). https://doi.org/10.1007/s00376-002-0073-1
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DOI: https://doi.org/10.1007/s00376-002-0073-1