Using the Pasquill letter codes for stability (given in Table 9-1 posted in Bb Learn) indicates what you believe

would be the stability code for the following conditions. In addition to specifying the stability classification
code, use the terms stable , Unstable or inversion, neutral, slightly stable or slightly unstable to describe each
condition.

a) A clear cool morning in late fall, cloudless and sun is up. U10 (wind speed at 10 meters) 0 m/s b) High noon
on a sunny summer day with light cloud cover and U10 = 3 m/s.
c) A dark, overcast and windy late afternoon day in August when U10 = 7 m/s. d) Midmorning on a cloudless, cold
January day when U10 = 1 m/s.
e) Midnight and cloudless with U10 = 2 m/s.
f) Noon on a sunny September day when U10 5 m/s and there is 50% cloud cover.
Using the ambient air temperature profile data given below, construct a temperature profile plot and estimate the
maximum mixing height for the following:

a) Air on the ground that is warmed to a temperature of 18 C.
b) A process gas having a temperature of 25 C and exhausted horizontally from a vent that is located 20-meters
above the ground.

(meter) Temperature. ( C)
0 17
100 16
200 15
300 15
400 16
500 18
600 20
1 of 2

Problem #3.3

Using the ambient air temperature data presented below, construct 3 different air temperature profile plots. and
indicate the stability condition near the ground, and if an inversion exists.

Altitude
(feet) 4 am
Temp. ( F) 10 am
Temp. ( F) 4 pm
Temp. ( F)
0 56.5 66.0 74.1
250 58.0 64.0 72.5
500 60.3 62.5 71.3
750 61.5 61.8 70.5
1, 000 62.0 61.6 69.6
1, 250 62.0 61.4 69.3
1, 500 61.6 61.0 68.5
1, 750 61.2 60.5 67.9
2, 000 60.8 60.0 66.8
2, 250 60.2 59.5 65.8
2, 500 59.7 59.1 64.2
2, 750 59.2 58.6 63.0
3, 000 58.6 58.2 61.5
3, 250 58.0 57.6 60.3
3, 500 57.5 57.2 59.1
3, 750 56.9 56.7 58.0
4, 000 56.4 56.3 57.0
4, 250 56.0 55.8 56.1
4, 500 55.2 55.2 55.3
4, 750 54.7 54.7 54.7

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