Divergence/Convergence on a Cross Section

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Vertical cross section of a polar trough…along 48S. Notice area of low level convergence (negative values/red) between 65W-57W and below 700 hPa, along and ahead of the trough. Aloft note divergence (positive values/blue) ahead of the trough.

Behind the trough, as expected, upper convergence dominates, with low level divergence evident below 600 hPa.