U9 =
Ap
A n
I
V
For T = 10°C
Ap : 3 mb and 4 mb
An = isobor spocing meosured in
degrees latitude
p
= 1013.3 mb
Po - 1.247X10“’ gm/cm’
f
: Coriolis parameter = 2 ùü sin 0
where
eu - ongular velocity of eorthj
0.2625 radians/hour
0 - latitude in degrees
20
25
30
35
40
45 50 55 60 70
Degrees Latitude
4mb Isobar Spocing
- Degrees
Latitude
(after Bretschneider, 1952a)
Figure 3-11. Geostrophic Wind Scale
3-26