Homework for Chapter 4 - Atmospheric Moisture

*SHOW
ALL WORK , CIRCLE THE CORRECT ANSWER, PLEASE BE NEAT AND **STAPLE
YOUR HOMEWORK**!*

*ALSO,
PLEASE USE A SPREADSHEET FOR ALL GRAPHS*

*Follow
the Problem solving steps discussed in class*

1. It can be shown that the saturation vapor pressure (*e*_{s}) depends only on
temperature:

where *e*_{o}*
= 6.11 hPa *and *T*_{o}* = 273 K*
are constant parameters. *R*_{v} is the
gas constant for water vapor and is equal to 461 JK^{-1}kg^{-1}.
*L* is the latent heat of evaporation if water is present
or the latent heat of deposition if ice is present. *T* is
the temperature in Kelvin

a. For water, create a plot of

e_{s}versus temperature for T=250 K to 273 K. Make suree_{s}is on the y axis and temperature is on the x axis. How doese_{s}depend on temperature? exp refers to the exponential function.b. On the same graph, plot

e_{s}versus temperature for ice.c. Is

e_{s}larger for ice or for water?

2. Given a parcel of air having a temperature of 35 degrees C and relative humidity of 95% find:

a. saturation vapor pressure

b. vapor pressure

d. If the temperature of the air increased to 40 degrees C will the air feel more or less humid? Explain.

3. Explain how and why each of the following will change as a parcel of air with an unchanging amount of water vapor rises, expands, and cools: (a) absolute humidity; (b) relative humidity; (c) actual vapor pressure; (d) saturation vapor pressure

4. Where in the U.S. would you go to experience the least variation in dew point from January to July?

EXTRA CREDIT: Given two parcels, one is dry containing 78% N2, 21% O2, and 1% AR while the other is moist, containing 78% N2, 21% O2, 0.5% AR, and 0.5% H2O. Show that the dry parcel has a larger density than the moist parcel.