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Midterm2005 - ESM 203 Earth System Science Jeff Dozier...

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ESM 203: Earth System Science Midterm 2005 Jeff Dozier Assigned October 27, due 11:00a.m. November 1 Damon Turney (e-mail to Damon – send no more than 2 files) The Midterm Examination counts 25% of your course grade. Answer three of the four questions. If you have time and want to answer a fourth question, we will sum the best three to get your midterm score. The exam is open-book. Please type your answers, al- though you may handwrite equations and diagrams if you wish and turn in the hard copy. You do not have to repeat the question in your answer; just use the number and letter des- ignations. You may use your notes, assigned readings, or other material. You may not use each other, so please do not discuss the exam with anyone else. You should refrain from even discussing the course at all, with anyone, between now and 11:00am Tuesday morning. By returning the answers via email or hard copy, you are certifying that you have completed this exam on your own. Some of the questions are straightforward, and ask you essentially to re-explain what we covered in class. Others questions are more mature, and require you to apply what you have learned to something we did not explicitly teach you. Read the questions carefully and write succinct, focused answers. Some of the questions may tempt you to diverge into questions of ideology. Avoid this by concentrating on the technical or management issue being raised. Try to be complete but concise. Do not bury your answer, which might be correct, too deeply. Please cite any material you use beyond the course notes and reading. If you have questions about the interpretation of the material, you may email Jeff. If he thinks you have thereby identified something about the exam that is unclear, he will post the answer to the rest of the class.
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(1) Effect of Polar Ice on Earth’s Temperature Our old friend, the Harte Energy-Balance Model of Earth-Surface Temperature (from Homework 1), can be used to investigate one probable consequence of green- house warming—the melting of polar ice. A rise in sea level would be brought about by the melting of land ice, such as the icecaps on Antarctica and Greenland. Melting of floating ice (sea ice) would not affect sea level, but would reduce the albedo in the polar regions and so raise the surface temperature. An albedo feedback therefore occurs: a decrease in albedo would cause some ice to melt, thereby exposing darker water or land underneath and further reducing the albedo.
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Midterm2005 - ESM 203 Earth System Science Jeff Dozier...

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