ESS55
Prof. Jin-Yi Yu
Vortocity and Divergence
qIncreasing vorticity in the zone between a ridge and a trough leads to upper air convergence and sinking motions through the atmosphere, which supports surface high pressure areas.
qDecreasing vorticity in the zone between a trough and a ridge leads to upper air divergence and rising motions through the atmosphere, which supports surface low pressure areas.