Lecture 9 - 2/8/2011 1 Climate Change ENV200H1S February 8...

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Unformatted text preview: 2/8/2011 1 Climate Change ENV200H1S February 8 2011 1 Announcements New shipment of textbooks have arrived Tutorial #2 Fair Share of Resources (Tragedy of the Commons) this week Midterm next week: Tuesday, Feb 15, 2011 A H: Med Sc auditorium A H: Med Sci auditorium I Z: EX200 (exam facility at 255 McCaul) 45 min, format to be discussed on Thur 2 Outline Global Climate Change Natural causes, anthropogenic inputs Carbon cycle: pools & fluxes Anthropogenic input Anthropogenic inputs impacts 3 Atmospheric circulation and the climate system: complex -systems within systems within systems Continents, oceans, Continents, oceans, major mountain major mountain ranges, and the ranges, and the formation of transient formation of transient weather systems all weather systems all 4 weather systems all weather systems all disrupt the nice neat disrupt the nice neat and tidy pattern of and tidy pattern of general circulation to general circulation to produce the actual produce the actual winds we see at the winds we see at the Earths surface Earths surface Weather & Climate Weather Atmospheric conditions at a specific place and time Rapid changes Rapid changes Climate Average weather conditions Changes over hundreds/thousands of years Important factors: temperature and precipitation 5 What can the past climate teach us about the future? Past behavior of Earths climate Past behavior of Earths climate system can provide insight into system can provide insight into what it may do in the future. what it may do in the future. But this assumes that But this assumes that anthropogenic CO anthropogenic CO 2 2 release and release and accumulation in the atmosphere accumulation in the atmosphere will behave similarly to natural will behave similarly to natural 6 changes in CO changes in CO 2 that have that have occurred in the past! occurred in the past! This may not be true as the This may not be true as the current rates of CO current rates of CO 2 increase are increase are higher than Earth has higher than Earth has experienced. experienced. 2/8/2011 2 1. 1. About 12 About 12-14,000 years ago, 14,000 years ago, Earth emerged from the Earth emerged from the most recent ice age and most recent ice age and warmed rapidly warmed rapidly 2. 2. Rapid ice melting put a huge Rapid ice melting put a huge flux of freshwater in the flux of freshwater in the oceans, disrupting deep oceans, disrupting deep ocean circulation. Average ocean circulation. Average temperatures fell, at least in temperatures fell, at least in 7 3. This cold period, known as the Younger Dryas, lasted ~1,000 years ....
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Lecture 9 - 2/8/2011 1 Climate Change ENV200H1S February 8...

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