# QG theory part 3 vorticity Flashcards

It can be shown that the rate of change of vorticity is strongly dominated by two processes

(change of vorticity with time)

- Vorticity advection
- Divergence

vorticity advection is resembled by

Divergence is resembled by

Vorticity

Rotation of wind around vertical axis (cyclonic or anticyclonic) vertical or in a slope

storm has …………. vorticity

large

How to get vorticity equation?

- using horizontal component of momentum equation (zonal and meridional)
- take the derivative of y of u component (zonal)
- take the derivative of x of v component (meridional)
- rearange
- subtract (meridional-zonal)
- simplify by scale analysis

vorticity equation:

term A means

local term

term b means

Vorticity advection

term c means

constant (coriolis parameter) & divergence

what does the equation mean?

vorticity is changing due to vorticity advection and divergence

the divergence term describe

the effects of divergence on the change of vorticity within a fluid.

When divergence occurs in a fluid, vorticity becomes more …………………

anticyclonic

When…………………… occurs in a fluid, vorticity becomes more anticyclonic

divergence

When convergence occurs in a fluid, vorticity becomes more ……………..

cyclonic