ys
166
Ip
——
bit.
“Ke In Ip
ny 2B
Amp.
TT
+
+} Gain * i
4
_|
Diff.
Amp.
ae= 1
Gain
I
‘BL
fin it
I
8
4 In Im
Vx
-_ —
a
1
I
M
iffi.
.
[
rt]
Amp.
8
4 In Tu
M
4
—F]
Gain = =
Ke
|
Atten.
x=l
_|
~—sOOitf.
Amp.
Divider
Vy
Ig
Ip
Ine - 2inge
vy 9° = lOvE
“Wy
M
Gain = 1
2
Ip
(10)
j
>
TIPS,
Ig
In - 4in =
I
Im
—B _ 2 In 8
"Ty
Iy
Attenuator
“Ke In
xm
I,
Ig
Ip
Ig
Ip
In - 41n =
In iy - 4 fn Im
In ir - 2In IM
In TT -
7, 1 (oy)4 tM
Ip
Ip
n Tu
(choose 10m = n)
Fia. 133.—Circuit diagram for providing a continuous reading of the mixing depth in the case of linear variation of pollutan
with height. Three pyrheliometers at one wave band and one zenith distance are used.
In (Fes), ee)
,
—MrQe)Odds 2 gy.(44)
(L + Ly)?
n Gaeserae,
Ip(r2)
To(A1)
coefficient varies linearly with height.
Figure 133 gives a cireuit diagram for providing a
continuous reading of the mixing depth.
Therefore,
L
Thus, H, the mixing layer depth is determined from
measured quantities for the case when the extinction
_
r+n,"*
gl
5
9)
and
CONCLUDING REMARKS
Vertical Distribution of Pollutants
The preceding development is based on an atmos-
LS”
phere in which the pollutants are distributed in height
either uniformlyor linearly. Under these conditions, it
One must exercise care to see that the square root is
taken of positive numbers only.
1/2
PtanH=at io,
:
+ a$™”
— 1a8"
_a
=
— Si2
H=
l
47
,
= [— sin
Work of other investigators has indicated that at
Ig(1) fora) |"
.
a | n (Pee TACHA
EFa(rr) Fy)
[ aes Zo() |
1/2
-[n (esses)
is possible to use pyrheliometers to determinethe thickness of the mixing layer. In every case, it was assumed
that the instruments measuring solar radiation were on
an equatorial mount and, therefore, pointing at the
sun. All of the equipment discussed, including the
equatorial mounts, is available commercially off the
shelf.
.
(48)
times the vertical distribution of pollutants may be exponential.” A development similar to that above for
the exponential distribution has been carried out byJ.
Gilroy and D. N. Eggenberger.®
The question arises on howto determine the distribu-
tion of pollutant concentration with height in order to