Geography Reference
In-Depth Information
(a)
150
360
350
340
330
320
300
50
310
40
40
300
290
30
500
10
280
20
700
0
270
850
260
10
-10
250
1000
70
60
50
40
30
(b)
150
6
5
350
4
340
3
330
300
2
1
320
500
310
290
280
700
300
270
850
260
250
1000
70
60
50
40
30
Latitude
Fig. 6.4
Latitude-height cross sections through a cold front at 80W longitude on 00 UTC January
14, 1999. (a) Potential temperature contours (thin solid lines, K) and zonal wind isotachs
(dashed lines, m s
−
1
). (b) Thin solid contours as in (a), heavy dashed contours, Ertel potential
vorticity labeled in PVU (1PVU
=
10
−
6
Kkg
−
1
m
2
s
−
1
).
