westerly belt long-wave 西风带长波
Provided that the phase propagates downward, the wave transports energy and westerly momentum upward.
在波动位相下传的情况下，波动向上输送能量和西风角动量。
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.
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。
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