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Name:ID #: Section #:AOS1 homework assignment #3,due Tuesday Nov 13, 2012 (1) [6 points]The following figure is from the 2007 IPCC Technical Summary (fig. 23, ).Some relevant pieces from the Technical Summary are quoted in the Appendix on the last page of this assignment.
Answer the following questions relating to this figure using the space provided: (a)What causes the variations ("wiggles") about the long term trend seen in observations and in different models? (b)What is the important difference between the upper and lower panels? In which decade do you feel the upward trend can first be distinguished from natural variability, and how does this change with time (give your reasoning)?
(2) [6 points]The following figure is from the 2007 IPCC Summary for Policymakers (fig. 4), and is also found in the 2007 IPCC Technical Summary (fig. 22).