Lab 6_Humidity and Atmospheric Stability 1
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Apr 3, 2024
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METO 1010 Online
Lab 6. Humidity and Atmospheric Stability 1
Instructions:
1) Type your answers in this Microsoft Word file and save your completed lab on your computer. Do not modify the format of the file.
2) Upload your lab on CANVAS by the due date. To upload the file, go to the course homepage and click on “assignments”. Click on the assignment that you want to submit, and on “submit assignment”. In the “file upload” box, click on “choose file” and select the appropriate file. Finally, click on “submit assignment”. Only .doc, .docx, and .pdf files are accepted. 3) In questions that require calculations, you are not required to show every step of your work, but the more detailed your answers are the more likely you are to receive partial credit for wrong answers. 4) Proper units and terminology are always necessary. 1) Fill out the table below. For each change of state of water, indicate its name, whether heat is absorbed or released, and an example from your daily life. The first row has already been filled for you. (3.75 points)
Change of State
Name Heat (Absorbed or
Released?)
Daily Life Example
Ice→Liquid Water
Melting
Absorbed
Ice cubes melting in a
glass
Liquid Water→Water
Vapor
Evaporation
Absorbed
Boiling water
evaporating into the
air
Ice→Water Vapor
Sublimation
Absorbed
Snow on mountain
tops vaporizing
Water Vapor→Liquid
Water
Condensation
Released
Water vapor
condensing around
the cup of cold
beverage
Water Vapor→Ice
Deposition
Released
Frost on the surface
1
of leaves
Liquid Water→Ice
Freezing
Released
Freezing water into
ice cubes
2) Suppose that 500 g of water vapor condense to make a cloud about the size of an average room. a) If we assume that the latent heat of condensation is 600 cal/g, how much heat would be released to the air? (1 point)
Heat released (cal)= 500*600=
300,000 cal
b) If the total mass of air before condensation is 100 kg, how much warmer would the air be after
condensation? Keep one decimal figure. (4 points)
Data/conversion factors needed: mass of air, amount of heat, heat capacity of air / kg to g
Heat capacity of air in typical room conditions=
0.24
cal
g×
℃
1 kg=1,000 g
Hint: this is a type of problem that is easier to solve by thinking in terms of units. The question is
“how much warmer”, so what type of units do you expect for your answer? How can you arrange
the numbers and units given by the problem to cancel out all the units except the one you want in
your answer?
300,000 / (0.24*100,000) = 12.5 ℃
3) Fill out the table below. Given the temperature of these air parcels, use the table that you have in the slides to determine their saturation mixing ratio. Subsequently, use the provided actual mixing ratio to determine the relative humidity. Keep two decimal figures for both the saturation mixing ratio and the relative humidity. (2.5 points)
Temperature (°C)
Saturation mixing
ratio (g/kg)
Actual mixing ratio
(g/kg)
Relative Humidity
(%)
14
10.14
5
49.31
14
10.14
9
88.76
24
19.21
5
26.03
2
24
19.21
2
10.41
34
35.13
7
19.93
4) Fill out the table below. Given the temperature of these air parcels, use the table that you have in the slides to find their saturation mixing ratio. Subsequently, use their relative humidity to find
their actual mixing ratio. Keep two decimal figures for both the saturation and actual mixing ratios. Finally, rank the air parcels from 1 (highest) to 5 (lowest) in order of water vapor content
. (3.75 points)
Temperatur
e (°C)
Saturation
mixing ratio
(g/kg)
Relative
humidity
(%)
Actual
mixing ratio
(g/kg)
Rank
14
10.14
90
9.13
3
20
14.96
60
8.98
4
24
19.21
40
7.68
5
30
27.69
40
11.08
1
34
35.13
30
10.54
2
5) Go to the following website https://forecast.weather.gov/MapClick.php?lat=40.2337&lon=-
111.6685#.W-XBgpNKhPZ
. Report the value for the current temperature at the Provo Airport. (1
point)
Temperature at the Provo Airport (°F)= 27 °F
6) Use the table that you have in the slides to find the current saturation mixing ratio at the Provo
Airport. Keep two decimal figures. Units are a must
. (1 point)
Saturation mixing ratio at the Provo Airport= (27 – 32) / 1.8 = -2.77778°C I’ll assume that is -2°C since the table only provides numbers by multiples of 2.
= 3.313 g/kg
7) Report the value for the current relative humidity at the Provo Airport. (1 point)
3
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Relative humidity at the Provo Airport (%)= 79%
8) Given the saturation mixing ratio and the relative humidity reported above, calculate the current actual mixing ratio at the Provo Airport and report the value below. Keep two decimal figures. Units are a must
. (2 points)
Actual mixing ratio at the Provo Airport= 3.313 * 0.79 = 2.62 g/kg
4