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ENVR200_10Nov10_Recent_ClimateChange

ENVR200_10Nov10_Recent_ClimateChange - TAOfficeHours...

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09/11/2010 1 TA Office Hours Assignment 2 & Midterm Question 2: Thursday Nov 11, 1:00 pm – 3:00 pm Burnside Hall Room 429 (TAs Annelise Godber & Youngil Kim) Midterm Questions 1 & 3: TBA Earth’s Orbital Changes Current Affects total amount of solar radiation Current Affects seasonal High latitudes: Current variability Shorter, milder winters (glaciers retreat) Longer, cooler winters (glaciers advance) Look at last 400,000 years
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09/11/2010 2 Average monthly insolation – June (calculated) 17 δ 18 O(ice core) Problem: changes in insolation (particularly orbital eccentricity factor) far too small to account for the observed (recorded) changes in temperature. Therefore: Milankovitch cycles may initiate the start and termination of glaciations BUT feedbacks are needed to continue glaciation process. Ice Albedo Feedback
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