Homework 4

This homework assignment is due on Friday, September 30 at the beginning of the lecture.

 

  1. Determine the noon sun angle at the Tropic of Capricorn (23.5°S) on June 21.
  2. Is the sun ever directly overhead in Omaha (40°N)? Why or why not?
  3. Answer "Review Question 1" on page 125 in your textbook.
  4. Answer "Review Question 5" on page 125 in your textbook.
  5. What is the vapor pressure of an air parcel when the relative humidity is 50% and the saturation vapor pressure is 20mb?
  6. Why is it necessary for a cloud droplet to GROW?
  7. Drizzle drops are very small. Does drizzle fall out of HIGH clouds or LOW clouds? Why?
  8. Fill in the blanks in this paragraph: "The Bergeron process works because the saturation vapor pressure over ice crystals is slightly _______________ (higher or lower?) than the saturation vapor pressure over supercooled water droplets. Consequently, in a cloud, often the relative humidity is slightly __________________ (greater or less?) than 100% around ice crystals and slightly __________________ (greater or less?) than 100% around supercooled water droplets. Therefore the _________________ (ice crystals or water droplets?) grow and the ______________________ (ice crystals or water droplets?) evaporate. The cloud changes in such a way that now there are __________________ (many or few?) ___________________ (small or large?) ice crystals and ________________ (many or few?) ___________________ (small or large?) supercooled water droplets. Changing the sizes of the droplets and ice crystals in this way makes ___________________ (condensation or coalescence?) a much faster process."
  9. Answer "Review Question 8" on page 125 in your textbook.