Tropical Wave (Cross)Convergence/Divergence/Vertical Motion

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Vertical cross section of ageostrophic circulation/vertical motion (yellow arrows), wind divergence (blue) and wind convergence (red).

As it was to be expected, the low level convergence and mid/upper divergence west of the trough axis favors ascending vertical motion�as indicated by the vectors/arrows pointing up. East of the trough, the mid level convergence and low level divergence favors downward (subsidence) vertical motion� once again depicted by the vectors/arrows pointing towards the surface.