WMOD00399

• Title: WMO Training Workshop on Weather Modification for Meteorologists - Lecture Notes
• Date: 12/1/1979
• Weather Modification - Doc Type: Report

- 58

rThe other quantities can easily be calculated:

TI 1 20 ni'Oi3
W = 6 F.t L1 v(Di)

TI 3.6 1 20
R - - - \;' (nJ.' . OJ.' 3) (= 0.16 mmh-1 J
6 1 03 F' t ~
J.=1

1 20 w'O,6
Z = \;' J. J.
F.tL v(Di).
i=1

(= 3.21 mm3m-3J

(10)

~

(= 0.26 mm6m-3)

(all values in paranth~ses
are for i=I:J

The numerical values for our example and the dimensions are given in parenthes{s. A table
containing.the values for all diameter intervals of the distrometer can be found in Wald-
vogel (1974) and will be distributed at the workshop.

In Table 3 the measured ni for two: spectra a and c are given. From these raw data ii'~s
easy to calculate the values for W. R. Z using equations (10) and the spectrum jparameters
No and ^ from eq. (9). The spectra are also plotted in the usual way in Fig. 13. in which
the median drop diameter Ow is indicated as well.

Table 3: Two spectra. each measured over
a 1-min. period. with the corresponding
parameters.

o
(rrm)

Spectrum
a

Spectrum
c

0.3-0.4
0.4-0.5
0.5-0.6
0.6-0.7
0.7-0.8
0.8-1.0
1.0-1.2
1.2-'\..4
1.4-1.6
1.6-1.8
1.8-2.1
2.1-2.4
2.4-2.7
2.7-3.0
3.0-3.3
3.3-3.7
3.7-4.1

45
39
55
75
84
195
129
53
13
4
3
1

62
59
70
84
84
80
48
30
19
13
24
17
12
4
4
1
1

1
i
r-o. .
I'

i'

, .
1

Total

W(mm3m-3)
R(rrvn hr-1)
Z(mm6 m-3)
No(m-3nm-1)
>..Cmm-;1 )

696

250
3.8
767
25200
4~2

612

381
8.1
8306
2790
2.2