ACTIVITY 15.8 Adiabatic Processes and CloudFormation Figure 15.10 shows air that begins with a temperature of 25°C and a relative humidity of 50 percent flowing from the ocean over a coastal mountain range. Assume that the dew-point temperature remains constant in dry air (relative humidity less than 100 percent). When the air parcel becomes saturated, the temperature and dew-point temperature become equal. As the air continues to ascend, the temperature and dew-point temperature will decrease at the wet adiabatic rate, but the dew-point temperature does not change as the air parcel descends. (Completing Figure 15.10 may be helpful.) 1. Use Table 15.2 to determine the saturation mixing ratio, water-vapor content, and dew-point temperature of the air at sea level in Figure 15.10. 10 10 Saturation mixing ratio: g/kg of eir Water-vapor content: Dew-point temperature: 2. Is the air at sea level saturated or unsaturat? unsaturated Temp. Dew pt. 3000 m Temp. Dew pt. Temp. Dew pt. C. E. 2000 m Temp. Dew pt. Тemp. F. Dew pt. В. 1000 m Temp. Dew pt. Temp. Dew pt. G. Temp. at Point A = 25°C Relative humidity at Point A = 50% Dry adiabatic rate = 10°C/1000 meters Wet adiabatic rate = 5°C/1000 meters А. Sea level A Figure 15.10 Adiabatic processes and cloud formation associated with air being lifted over a mountain barrier.
ACTIVITY 15.8 Adiabatic Processes and CloudFormation Figure 15.10 shows air that begins with a temperature of 25°C and a relative humidity of 50 percent flowing from the ocean over a coastal mountain range. Assume that the dew-point temperature remains constant in dry air (relative humidity less than 100 percent). When the air parcel becomes saturated, the temperature and dew-point temperature become equal. As the air continues to ascend, the temperature and dew-point temperature will decrease at the wet adiabatic rate, but the dew-point temperature does not change as the air parcel descends. (Completing Figure 15.10 may be helpful.) 1. Use Table 15.2 to determine the saturation mixing ratio, water-vapor content, and dew-point temperature of the air at sea level in Figure 15.10. 10 10 Saturation mixing ratio: g/kg of eir Water-vapor content: Dew-point temperature: 2. Is the air at sea level saturated or unsaturat? unsaturated Temp. Dew pt. 3000 m Temp. Dew pt. Temp. Dew pt. C. E. 2000 m Temp. Dew pt. Тemp. F. Dew pt. В. 1000 m Temp. Dew pt. Temp. Dew pt. G. Temp. at Point A = 25°C Relative humidity at Point A = 50% Dry adiabatic rate = 10°C/1000 meters Wet adiabatic rate = 5°C/1000 meters А. Sea level A Figure 15.10 Adiabatic processes and cloud formation associated with air being lifted over a mountain barrier.
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Question
What are the values for Points A, B, C, D, E, F, and G in Figure 15.10?
Transcribed Image Text:ACTIVITY 15.8
Adiabatic Processes and Cloud Formation
Figure 15.10 shows air that begins with a temperature of 25°C and a relative humidity of 50 percent flowing from the
ocean over a coastal mountain range. Assume that the dew-point temperature remains constant in dry air (relative humidity
less than 100 percent). When the air parcel becomes saturated, the temperature and dew-point temperature become
equal. As the air continues to ascend, the temperature and dew-point temperature will decrease at the wet adiabatic rate,
but the dew-point temperature does not change as the air parcel descends. (Completing Figure 15.10 may be helpful.)
1. Use Table 15.2 to determine the saturation mixing ratio, water-vapor content, and dew-point temperature of the
air at sea level in Figure 15.10.
Saturation mixing ratio:
10
g of air
10
15
Water-vapor content:
Dew-point temperature:
2. Is the air at sea level saturated or unsaturates?
unsaturated
Temp.
Dew pt.
D.
3000 m
Temp.
Temp.
Dew pt.
Dew pt.
E.
С.
2000 m
Temp.
Temp.
Dew pt.
F. Dew pt.
1000 m
Temp.
Dew pt.
Temp.
Dew pt.
G.
Temp. at Point A = 25°C
Relative humidity at Point A = 50%
Dry adiabatic rate = 10°C/1000 meters
Wet adiabatic rate = 5°C/1000 meters
A.
Sea level
A Figure 15.10 Adiabatic processes and cloud formation associated with air being lifted over a
mountain barrier.
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