LIMITATIONS AND ASSUMPTIONS
The restrictions as well as the principles taken for
granted in using the DVAL program areas follows:
l The algorithm used by this program applies to a
maximum altitude of 11,000 geopotential meters.
. The D-value for MSL is determined by
extrapolating the pressure and temperature data to MSL
by using the data for the first two levels of the entered
environmental profile. Caution should be exercised in
determining over-water surface D-values using
radiosonde data from a coastal location when the
balloon-release height is >50 meters.
FUNCTIONAL DESCRIPTION
AD-value is defined as a difference in the observed
height of a particular isobaric surface and the height
associated with that isobaric surface in the U.S.
Standard Atmosphere. Table 7-1 shows an example of
the D-value profile.
Table 7-1.-Example Output of the D-Value Profile
UNCLASSIFIED
D-VALUE PROFILE
ALT.(F)
D-VALUE(F)
ALT.(F)
D-VALUE(F)
ALT.(F)
D-VALUE(F)
.0
1.4
9500.0
28.8
19000.0
42.4
500.0
3.1
10000.0
29.7
19500.0
43.1
1000.0
4.8
10500.0
30.1
20000.0
44.0
1500.0
6.6
11000.0
30.6
20500.0
45.0
2000.0
8.3
11500.0
31.0
21000.0
46.1
2500.0
10.1
12000.0
31.5
21500.0
47.4
3000.0
11.9
12500.0
32.0
22000.0
48.9
3500.0
13.7
13000.0
32.6
22500.0
50.5
4000.0
15.5
13500.0
33.2
23000.0
52.3
4500.0
17.4
14000.0
33.8
23500.0
54.2
5000.0
18.9
14500.0
34.5
24000.0
56.1
5500.0
20.1
15000.0
35.2
24500.0
57.8
6000.0
21.2
15500.0
36.0
25000.0
59.4
6500.0
22.2
16000.0
36.9
25500.0
61.0
7000.0
23.3
16500.0
37.8
26000.0
62.5
7500.0
24.4
17000.0
38.8
26500.0
63.9
8000.0
25.5
17500.0
39.8
27000.0
65.2
8500.0
26.6
18000.0
40.9
27500.0
66.4
9000.0
27.7
18500.0
41.8
28000.0
67.6
171255 UTC AUG86 3500N 01500E
UNCLASSIFIED
7-3
