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Unformatted text preview: 1 ESC3704 Name 85 points December 3, 2010 18 students took exam - Numbers to the left of the question number in red are the number of incorrect responses. Instructor comments are in blue . Florida Atlantic University Environmental Issues in Atmospheric and Earth Science Final Examination Key True-False- Print the letter T or F in the blank to indicate if each of the following statements is true or false. Illegible answers are wrong. (1 point each) T 1. Clouds interact with both visible and infrared radiation. Depending upon the type of interaction, they may either cool the planet (negative feedback) or warm the planet (positive feedback). 1 F 2. When the electric field of visible light excites vibrations in water molecules, the molecules re- radiate the light at the same frequency, mostly in a direction similar to the direction of the incoming radiation. The process is called absorption. 1 T 3. Water will form droplets much more readily if there are cloud condensation nuclei in the air to which vapor molecules can attach themselves, than if the air is relatively free of particles. 11 F 4. Warm, low-level clouds have more water vapor than cold clouds, and therefore the warm clouds have a higher albedo. 5 T 5. Using the GISS global climate model, changes in low- and high-level clouds mostly cancelled each other out, so the net global effect of the clouds did not differ very much in the warmer climate scenario from that in today's climate. This is contrary to 1990's thinking, when it was thought that brighter clouds caused by climate change would cool the planet, and help save us from global warming. T 6. Cirrus clouds may be created by jet contrails. 5 T 7. The smoke emitted by ships has been shown to form chains of clouds in areas where the air is clean. 5 T 8. Marine deserts, characterized by low biological productivity, are large generators of dimethyl sulfide. 2 9 F 9. The ocean regions which have the highest chlorophyl content, and which are interpreted as biologically very productive, are located in two belts, just north or south of the equator. 1 F 10. Climate models predict that marine deserts will contract, increasing the overall biological productivity of the oceans. 6 T 11. During an Ice Age, the temperature difference between the polar regions and the equator is greater than during an inter-glacial period. 4 F 12. The earth has only experienced one Ice Age, during the Pleistocene Epoch. 5 T 13. Milder, warmer winters in high latitudes often lead to greater snowfall. T 14. The first oceans on earth were composed of fresh water. 3 F 15. Brackish water is more saline than the open ocean. Examples of brackish water are found in Chesapeake and San Francisco Bays....
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- Spring '10