1. Consider the information in the chart below. Location A B C Mixing ratio (g/k
ID: 117247 • Letter: 1
Question
1. Consider the information in the chart below. Location A B C Mixing ratio (g/kg) 6 g/kg 6 g/kg 7 g/kg Saturation mixing ratio (g/kg) 6 g/kg 12 g/kg 10 g/kg Relative Humidity (%) (6/6)*100 = 100 (6/12)*100= 50 (7/10)*100= 70 e. Which location has the highest RELATIVE moisture content? Explain how you determined this. f. What would you have to do to r at location C to make the air saturated? How could this be done? g. What would you have to do to rs at location C to make the air saturated? How could this be done? h. If the temperature cooled at location A, what would happen to its rs? i. How would this affect r at A? What would happen to the extra water vapor? 2. If the saturation mixing ratio is 8 g/kg and the RH is 25%, what is the mixing ratio? 3. If the relative humidity is 50% and the mixing ratio is 10 g/kg, what is the saturation mixing ratio? 4. Which of the following indicates a decrease in air’s capacity for water vapor? A. A decrease in mixing ratio B. A decrease in saturation mixing ratio C. A decrease in relative humidity D. A decrease in dewpoint temperature 5. At 10ºC, the atmosphere is saturated with water vapor. If the air temperature increases to 15ºC with no addition or removal of water vapor, one may conclude that the dew point is about: A. 5ºC. B. 10ºC. C. 15ºC. D. 25ºC.
Explanation / Answer
e) Location A has the highest relative moisture content. Because it has a relative humidity of 100%.
f) We have to increase mixing ratio to make the air saturated. The mixing ratio is the ratio of the mass of water vapor to the mass of dry air and is expressed in grams per gram or in grams per kilogram. Warm air can hold more water vapor than cold air at constant pressure. In order to increase the miing ratio, we have to decrease the temperature of the parcel.
g) We have to decrease the saturation mixing ratio to make the air saturated.
h) If the temperature cooled at location A, its saturation mixing ratio(rs) decreases and actual miing ratio increases(r). Extra watervapor condensed.
2.
Relative Humidity, RH=Actual mixing ratio/Saturation mixing ratio
Saturation mixing ratio = Actual mixing ratio/Relative Humidity, RH = 8/0.25 =32g/kg
3.Saturation mixing ratio = Actual mixing ratio/Relative Humidity, RH = 10/0.5 =20g/kg
4.
A. Decrease in mixing ratio, decrease the air's capacity of water vapor.
B. A decrease in saturation mixing ratio is the decrease in air's capacity of water vapor.
C.Decrease in relative humidity is also a increase in air's capacity of water.
D. Decrease in dewpoint temperature decreases the air's capacity of water.
5.At T=10oC, RH=100%,
Td=T-((100-RH)/5)
Td=15oC
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