class19a - AST 309S The Solar System MWF 11-12 John Lacy R...

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AST 309S The Solar System MWF 11-12 John Lacy RLM 16.332, M-F 12-12:30 471-1469 lacy@astro.as.utexas.edu Amanda Bayless Daniel Kagan RLM 16.312, Th 10-12 RLM 16.322A, W 3-5 471-3462 471-6858 baylessa@astro.as.utexas.edu kagan@astro.as.utexas.edu class website: www.as.utexas.edu courses AST 309S username: AST password: 309
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Topics from chapter 5.5-5.7 evaporation and condensation of water, vapor pressure atmospheric motion, Hadley cells troposphere stratosphere, ozone layer thermosphere and ionosphere magnetosphere
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Reading for this week Chapter 5: Atmospheres of Terrestrial Planets Today How we are changing the Earth’s atmosphere and temperature
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Melting of polar ice You may have heard that the ice covering the Arctic Ocean is melting. Probably the melting is caused by higher temperatures in the Arctic. There is a feedback effect associated with melting of ice. Will the melting of the ice cause additional heating or will it slow down the heating? Is the feedback effect a positive one or a negative one?
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Your answers After the ice melts, the water can evaporate, increasing the water vapor in the atmosphere, increasing the heating. Melting doesn’t actually increase the rate of evaporation, but if the water warms up after melting, evaporation will increase. The process of melting takes heat out of the air, slowing the heating. This is true. It doesn’t keep the equilibrium temperature from rising, but it does make the temperature rise take longer. The temperature would rise because ice reflects sunlight
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class19a - AST 309S The Solar System MWF 11-12 John Lacy R...

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