指出纬向梯度、经向梯度、全梯度矢量的昼夜变化与季节特性。
The latitudinal and longitudinal gradients, their diurnal variations and seasonal characteristics are dealt with.
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。
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.
ITF的年代际变化是：年代际信号取决于赤道太平洋纬向风应力的变化。
The decadal variation of ITF is that the decadal signal lies in the change of latitude-oriented wind stress in the Equator-Pacific region.
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