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Flashcards in QG theory part 3 vorticity Deck (37)
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1

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

2

vorticity advection is resembled by 

3

Divergence is resembled by

4

Vorticity

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

5

storm has ............. vorticity

large

6

How to get vorticity equation?

  1. using horizontal component of momentum equation (zonal and meridional)
  2. take the derivative of y of u component (zonal)
  3. take the derivative of x of v component (meridional)
  4. rearange
  5. subtract (meridional-zonal)
  6. simplify by scale analysis

7

vorticity equation:

8

term A means

local term 

9

term b means

Vorticity advection

10

term c means

constant (coriolis parameter) & divergence

11

what does the equation mean?

vorticity is changing due to vorticity advection and divergence

12

the divergence term describe 

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

13

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

anticyclonic

14

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

divergence

15

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

cyclonic

16

When .............................occurs in a fluid, vorticity becomes more cyclonic

convergence

17

When divergence occurs in a fluid, vorticity becomes more anticyclonic. Thus, ..............................spins up ................................vorticity

convergence, cyclonic

18

When ......................occurs in a fluid, vorticity becomes more ......................... Thus, convergence spins up cyclonic vorticity

 divergence, anticyclonic

19

Surface low-pressure centers are characterized by ...............................and thus tend to be foci for the production of low-level cyclonic vorticity.

convergence

20

Surface low-pressure centers are characterized by convergence and thus tend to be ..............................................................

foci for the production of low-level cyclonic vorticity.

21

upper divergence results in vorticity....

anticyclonic

22

upper convergence results in......

cyclonic 

23

vorticity cyclonic (+ve or -ve)

+ve vorticity

24

vorticity anticyclonic (+ve or -ve)

-ve vorticity

25

Upstream of the trough, the geostrophic wind is directed from the .................................towards the .................................

vorticity minimum, vorticity maximum

26

.............................................., the geostrophic wind is directed from the vorticity minimum towards the vorticity maximum.

Upstream of the trough

27

Downstream of the trough, the geostrophic wind is directed from the ........................................ towards the .................................

vorticity maximum, vorticity minimum

28

................................................, the geostrophic wind is directed from the vorticity maximum towards the vorticity minimum.

Downstream of the trough,

29

Note that regions of maximum vorticity advection is collocated with regions of ...........................................

divergence

30

Note that regions of .......................................vorticity advection is collocated with regions of divergence

maximum