Point of Condensation 3. Recall that the air temperature and the dew point must equal one another for condensation to occur. If this air parcel is lifted orographically up the windward side of the Coast Range, at what altitude will condensation begin? (Hint: you need determine which is the proper lapse rate to use for this question: Is it the wet or the dray?) ALT m 4. Summarize the air temperature, dew point temperature, and the relative humidity of the air parcel at this elevation. AT DP RH ● % The Crest 5. Using the following procedures, determine the air parcel's temperature at the 2400 meter crest. To find the air parcel temperature at a specific elevation: Choose the appropriate lapse rate to use in your calculations based on whether or not condensation is occurring in this air parcel Find the difference in elevation between the elevation in question and the elevation that corresponds to the point at which you begin using the appropriate lapse rate for these conditions • Multiply this difference in elevation by the lapse rate you have chosen for these conditions • Take this number and add it to, or subtract it from, the parcel's original temperature at the place where you began using the appropriate lapse rate. This will give you the air parcel temperature

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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Question
Point of Condensation
3. Recall that the air temperature and the dew point must equal one another for condensation to
occur. If this air parcel is lifted orographically up the windward side of the Coast Range, at what
altitude will condensation begin? (Hint: you need determine which is the proper lapse rate to
use for this question: Is it the wet or the dray?)
ALT
4. Summarize the air temperature, dew point temperature, and the relative humidity of the air
parcel at this elevation.
AT
C
DP
RH
m
The Crest
5. Using the following procedures, determine the air parcel's temperature at the 2400 meter crest.
To find the air parcel temperature at a specific elevation:
Choose the appropriate lapse rate to use in your calculations based on whether or not
condensation is occurring in this air parcel
●
• Multiply this difference in elevation by the lapse rate you have chosen for these conditions
Take this number and add it to, or subtract it from, the parcel's original temperature at the
place where you began using the appropriate lapse rate. This will give you the air parcel
temperature
AT
Find the difference in elevation between the elevation in question and the elevation that
corresponds to the point at which you begin using the appropriate lapse rate for these
conditions
C
Transcribed Image Text:Point of Condensation 3. Recall that the air temperature and the dew point must equal one another for condensation to occur. If this air parcel is lifted orographically up the windward side of the Coast Range, at what altitude will condensation begin? (Hint: you need determine which is the proper lapse rate to use for this question: Is it the wet or the dray?) ALT 4. Summarize the air temperature, dew point temperature, and the relative humidity of the air parcel at this elevation. AT C DP RH m The Crest 5. Using the following procedures, determine the air parcel's temperature at the 2400 meter crest. To find the air parcel temperature at a specific elevation: Choose the appropriate lapse rate to use in your calculations based on whether or not condensation is occurring in this air parcel ● • Multiply this difference in elevation by the lapse rate you have chosen for these conditions Take this number and add it to, or subtract it from, the parcel's original temperature at the place where you began using the appropriate lapse rate. This will give you the air parcel temperature AT Find the difference in elevation between the elevation in question and the elevation that corresponds to the point at which you begin using the appropriate lapse rate for these conditions C
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
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