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Unformatted text preview: Solutions to Homework from Homework: Exercises for Weather and Climate , Lab. 23 EES 108: Earth and Atmosphere Due Tues. Sept. 6 Lab 2, #9 Following the patterns provided below, draw a simple series of sketches for solar noon on June 21 at a site at 30 N and on December 22 and June 21 for a site at 60 N. Indicate the zenith angle, solar angle, and beam spreading in each diagram. Note that you will need to change the scale of the beam for December 22 at 60 N. Answer: 9. 60 N Dec. 22 30 N June 21 60 N June 21 10. Summer temperature is highest because solar radiation is more concentrated. During the winter, its cooler as the solar beam is spread over a greater surface area. 11. There is a much greater seasonal range in daylight hours in polar regions than in tropical regions. 12. 30 N 60 N June solstice 14 18 Equinoxes 12 12 December solstice 10 6 13. 60 N 14. The change in daylight hours is greatest near the equinoxes (when solar declination changes are greatest) and smallest near the solstices. 1 unit Suns rays Sun angle 83.5 Zenith angle 6.5 1.01 units 1 unit Suns rays 8.83 units Zenith angle 83 1 / 2 Sun angle 6 1 / 2 1 unit Suns rays Zenith angle 36 1 / 2 1.24 units Sun angle 53 1 / 2 Lab 2, #10 Given these sketches, explain why sun angle causes seasonal tempearture changes in the mid-latitudes. Answer: Summer temperature is highest because solar radiation is more concentrated. Dur- ing the winter, its cooler as the solar beam is spread over a greater surface area. EES 108 Answers to Homework for Lab. 2 3 Due Sept. 6 To emphasize, with more detail than you needed to give for your answer: in the winter, the solar radiation at 60 N is spread over seven times as much area as in the summer ( 8 . 83 / 1 . 24 = 7 . 12 ), so its only one seventh as intense. Thats why its so much colder in December than in June....
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This note was uploaded on 12/15/2011 for the course EES 108 taught by Professor Giligan during the Spring '11 term at Vanderbilt.
- Spring '11