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EXAM1 Answers - GEO305 Global Warming Spring 2012...

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NAME_Answer Key ___________________________ EXAM 1, 2/13/2012 Please answer to the best of your ability. Good luck! 1. Define greenhouse gas , and identify the most powerful greenhouse gases. Greenhouse gases are gases that trap heat in the atmosphere. CH , CO , H O apor, NOX, O 2. Consider the plot at right from our text. a) What is name of this plot? Keeling Curve b) What is the significance of the saw-toothed nature of the plotted trend? This plot shows the seasonal drawdown of CO in the northern hemisphere during the summer and the rise of CO in the northern hemisphere during the winter. The drawdown of CO is due to the intact of deciduous trees in the spring and summer months. You can see the exponential rise of CO due to the burning of fossil fuels. c) Where would you estimate CO 2 concentration to be in the year 2050, based on the slope of the line shown? 400+ 3. Use the following terms in a sentence each, describing the function of Earth’s climate system: ATMOSPHERE, HYDROSPHERE, CRYOSPHERE, BIOSPHERE, and LITHOSPHERE. The atmosphere contains CO2 which is drawn down by microscopic plants that live in the ocean, which is part of the hydrosphere. The microscopic plants are members of the biosphere and their tests will eventually become part of the lithosphere in the form of chert (siliceous organisms) or limestone (calcareous organisms). The Greenland ice sheet and the Arctic and Antarctic ice sheets are part of the cryosphere and due to plate tectonics, the limestone and chert may one day be buried under the ice. 4. Contrast weather and climate . Weather is current conditions (short term, day to day) Climate is weather over some period of time (long term trends, 10-15 years or even 100,000-200,000 years) 5. What is a feedback in the climate system? Define feedback , and provide an example. A feedback is a phenomenon that amplifies or diminishes a force that acts to change climate. An example of a feedback is the Younger Drays, Venus (both positive).
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EXAM1 Answers - GEO305 Global Warming Spring 2012...

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