# HW #5 - AOS 100 Homework#5 1 Two saturated parcels of air A...

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AOS 100 Homework #5 1) Two saturated parcels of air, A and B, are lifted 1km. Parcel A has a specific humidity of 10g kg-1. Parcel B has a specific humidity of 20g kg-1. Which parcel experiences the lesser rate of cooling upon being lifted? Explain your answer. The definition of Specific Humidity is Total mass of water vapor Total mass of air parcel ; in detail, the amount of the water vapor of unsaturated is less than the amount of the water vapor saturated. We have SH = 10g kg-1 for parcel A and SH = 20g kg-1 for parcel B. With this fact, we know that parcel B has certainly more water vapors than parcel A. There are two different values for each dry adiabatic and moist adiabatic lapse rate. The dry adiabatic lapse rate, as it rises, is the rate of temperature dropping of unsaturated air parcel, which is 10 C/Km. And the moist adiabatic lapse rate, as it rises, is the rate of temperature dropping of saturated air parcel, which is 6 C/Km. 4 C/Km difference between moist and dry adiabatic lapse rate is caused because of the influence of latent heat. Throughout the saturated ascent, condensation of water vapor in the parcel can be caused by cooling. During the process of condensation, it releases the latent heat.

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## This note was uploaded on 05/11/2008 for the course AOS 101 taught by Professor Mark during the Spring '08 term at University of Wisconsin.

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HW #5 - AOS 100 Homework#5 1 Two saturated parcels of air A...

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