Air quality engineering, AP Meteorology

    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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