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Red Bluff As you track the parcel's descent to Red Bluff, keep in mind that descending air parcels warm as they are compressed. With no addition of water vapor, the actual specific humidity of a parcel remains constant while its saturation specific humidity, a function of parcel temperature, increases. Thus, the relative humidity of a descending parcel of air decreases. This is what is happening to this air parcel as it descends to Red Bluff. For this lab we can assume that relative humidity starts decreasing immediately as the parcel begins descending from the crest. 8. Returning to the procedures outlined in question 5, what is the parcel's air temperature at Red Bluff? AT C 9. As our air parcel descends down the eastern flank of the Coast Range, its temperature rises and condensation ceases to occur. Assuming that we add no moisture to the parcel of air, then we know that our specific humidity values remain constant as our parcel descends. What, then, is the dew point temperature at Red Bluff? DP C 10. What are the parcel's specific humidity and saturation specific humidity values at Red Bluff? SH _g/kg SSH _g/kg 11. Using these values, determine the parcel's relative humidity at Red Bluff. What does this suggest about the moisture content of the parcel here as compared to its origin in Eureka? RH %

Red Bluff As you track the parcel's descent to Red Bluff, keep in mind that descending air parcels warm as they are compressed. With no addition of water vapor, the actual specific humidity of a parcel remains constant while its saturation specific humidity, a function of parcel temperature, increases. Thus, the relative humidity of a descending parcel of air decreases. This is what is happening to this air parcel as it descends to Red Bluff. For this lab we can assume that relative humidity starts decreasing immediately as the parcel begins descending from the crest. 8. Returning to the procedures outlined in question 5, what is the parcel's air temperature at Red Bluff? AT C 9. As our air parcel descends down the eastern flank of the Coast Range, its temperature rises and condensation ceases to occur. Assuming that we add no moisture to the parcel of air, then we know that our specific humidity values remain constant as our parcel descends. What, then, is the dew point temperature at Red Bluff? DP C 10. What are the parcel's specific humidity and saturation specific humidity values at Red Bluff? SH _g/kg SSH _g/kg 11. Using these values, determine the parcel's relative humidity at Red Bluff. What does this suggest about the moisture content of the parcel here as compared to its origin in Eureka? RH %

Applications and Investigations in Earth Science (9th Edition)
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
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25 Altitude above sea level (hundres of meters) 201 151 10 5 ¶ Insert 0 EB Table Eureka Prevailing Wind Chart Text Shape Media Comment A $3 . un Lat Coast Range 2400 Red Bluff 100 m Figure 1: Cross section from Eureka to Red Bluff In the following exercise you will track the changes in air temperature, dew point temperature, specific humidity, saturation specific humidity, and relative humidity for a parcel of air that originates near the surface at Eureka, California. The prevailing westerlies force this air parcel to rise orographically over the 2400-meter crest of the Coast Range, and to descend to Red Bluff at an elevation of 100 meters in the Sacramento Valley below. Use the following guidelines to get started: The air temperature at Eureka is 18°C The dew point at Eureka is 13°C Recall that dry adiabatic lapse rate is 1°C per 100 meters We will use a wet adiabatic lapse rate of 0.6°C per 100 meters for the sake of this exercise You may also assume that water condensing in the atmosphere falls out as precipitation MacBook Pro F
Transcribed Image Text:25 Altitude above sea level (hundres of meters) 201 151 10 5 ¶ Insert 0 EB Table Eureka Prevailing Wind Chart Text Shape Media Comment A $3 . un Lat Coast Range 2400 Red Bluff 100 m Figure 1: Cross section from Eureka to Red Bluff In the following exercise you will track the changes in air temperature, dew point temperature, specific humidity, saturation specific humidity, and relative humidity for a parcel of air that originates near the surface at Eureka, California. The prevailing westerlies force this air parcel to rise orographically over the 2400-meter crest of the Coast Range, and to descend to Red Bluff at an elevation of 100 meters in the Sacramento Valley below. Use the following guidelines to get started: The air temperature at Eureka is 18°C The dew point at Eureka is 13°C Recall that dry adiabatic lapse rate is 1°C per 100 meters We will use a wet adiabatic lapse rate of 0.6°C per 100 meters for the sake of this exercise You may also assume that water condensing in the atmosphere falls out as precipitation MacBook Pro F
Red Bluff As you track the parcel's descent to Red Bluff, keep in mind that descending air parcels warm as they are compressed. With no addition of water vapor, the actual specific humidity of a parcel remains constant while its saturation specific humidity, a function of parcel temperature, increases. Thus, the relative humidity of a descending parcel of air decreases. This is what is happening to this air parcel as it descends to Red Bluff. For this lab we can assume that relative humidity starts decreasing immediately as the parcel begins descending from the crest. 8. Returning to the procedures outlined in question 5, what is the parcel's air temperature at Red Bluff? AT 9. As our air parcel descends down the eastern flank of the Coast Range, its temperature rises and condensation ceases to occur. Assuming that we add no moisture to the parcel of air, then we know that our specific humidity values remain constant as our parcel descends. What, then, is the dew point temperature at Red Bluff? DP 10. What are the parcel's specific humidity and saturation specific humidity values at Red Bluff? SH _g/kg SSH _g/kg 11. Using these values, determine the parcel's relative humidity at Red Bluff. What does this suggest about the moisture content of the parcel here as compared to its origin in Eureka? RH Rain-shadows % 6
Transcribed Image Text:Red Bluff As you track the parcel's descent to Red Bluff, keep in mind that descending air parcels warm as they are compressed. With no addition of water vapor, the actual specific humidity of a parcel remains constant while its saturation specific humidity, a function of parcel temperature, increases. Thus, the relative humidity of a descending parcel of air decreases. This is what is happening to this air parcel as it descends to Red Bluff. For this lab we can assume that relative humidity starts decreasing immediately as the parcel begins descending from the crest. 8. Returning to the procedures outlined in question 5, what is the parcel's air temperature at Red Bluff? AT 9. As our air parcel descends down the eastern flank of the Coast Range, its temperature rises and condensation ceases to occur. Assuming that we add no moisture to the parcel of air, then we know that our specific humidity values remain constant as our parcel descends. What, then, is the dew point temperature at Red Bluff? DP 10. What are the parcel's specific humidity and saturation specific humidity values at Red Bluff? SH _g/kg SSH _g/kg 11. Using these values, determine the parcel's relative humidity at Red Bluff. What does this suggest about the moisture content of the parcel here as compared to its origin in Eureka? RH Rain-shadows % 6
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