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As air rises, it expands and cools. The cooling, at the dry adiabatic lapse rate, is 10°C per 1,000 meters. (Descending air always warms at this rate.) In addition, the dew point temperature decreases about 2°C per 1,000 meters within a rising parcel of air. At the height at which the dew point temperature is reached, condensation begins and the wet adiabatic lapse rate of 5°C per 1,000 meters becomes operational. When the wet adiabatic lapse rate is in operation, the dew point temperature is equal to the air temperature. When a parcel of air descends, its dew point temperature increases 2°C per 1,000 meters. The height at which condensation begins, termed the lifting condensation level (LCL), can be determined by using the formula in this chapter’s special section entitled The Lifting Condensation Level. a. An air parcel has a temperature of 25°C and a dew point temperature of 14°C. What is the height of the LCL? If that parcel rises to 4,000 meters, what would be its temperature? A parcel of air at 6,000 meters has a temperature of –5°C and a dew point of –10°C. If it descended to 2,000 meters, what would be its temperature and dew point temperature?

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Fundamentals of Physical Geography

2nd Edition
James Petersen
Publisher: CENGAGE L
ISBN: 9781133606536
BuyFind

Fundamentals of Physical Geography

2nd Edition
James Petersen
Publisher: CENGAGE L
ISBN: 9781133606536

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Chapter
Section
Chapter 5, Problem 2PA
Textbook Problem

As air rises, it expands and cools. The cooling, at the dry adiabatic lapse rate, is 10°C per 1,000 meters. (Descending air always warms at this rate.) In addition, the dew point temperature decreases about 2°C per 1,000 meters within a rising parcel of air. At the height at which the dew point temperature is reached, condensation begins and the wet adiabatic lapse rate of 5°C per 1,000 meters becomes operational. When the wet adiabatic lapse rate is in operation, the dew point temperature is equal to the air temperature. When a parcel of air descends, its dew point temperature increases 2°C per 1,000 meters. The height at which condensation begins, termed the lifting condensation level (LCL), can be determined by using the formula in this chapter’s special section entitled The Lifting Condensation Level.

  1. a. An air parcel has a temperature of 25°C and a dew point temperature of 14°C. What is the height of the LCL? If that parcel rises to 4,000 meters, what would be its temperature?

A parcel of air at 6,000 meters has a temperature of –5°C and a dew point of –10°C. If it descended to 2,000 meters, what would be its temperature and dew point temperature?

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Fundamentals of Physical Geography
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