Trinity ENVS 110 - Lecture notes (41 pages)

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Lecture notes



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Lecture notes

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Pages:
41
School:
Trinity College
Course:
Envs 110 - The Earth's Climate
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The Earth s temperature over the past 2000 years The famous hockey stick http www grida no climate ipcc tar wg1 pdf WG1 TAR FRONT PDF http en wikipedia org wiki Image Instrumental Temperature Record png Average Global Temperatures last 150 years or so based on instrumental record how to calculate an average how to deal with data inconsistencies http alignment hep brandeis edu Hashemi Climate First Conclusions establishing an average even for an instrumental record is difficult there should be quite a bit of variation or error in the data you might want to take a long hard look at what people show you So what did happen since 1850 general warming trend since 1900 or so peak in temperature around WWII 1940 s drop in temperatures in 1950 s general rise since then how much change error of estimate cause s claim most of the increase in temperature occurred before 1940 when industrial production was insignificant Jones P D and Moberg A 2003 Hemispheric and large scale surface air temperature variations An extensive revision and an update to 2001 Journal of Climate 16 206 223 And farther back in time The famous hockey stick http www grida no climate ipcc tar wg1 pdf WG1 TAR FRONT PDF nevertheless reconstructions of past temperatures are difficult even if instrumental records are available slightly different approach look at effects of climate change plant migrations geologic features e g glaciers societal change paleoclimate for the art historians Wheatstacks Claude Monet 1890 Number of reported sea floods per century in the North Sea region Source Lamb 1995 http thames me uk s00050 files Frost 20fair 201789 jpg The Hunters in the Snow Pieter Brueghel 1565 The Jewish Cemetery Jacob van Ruisdale 1657 Large Enclosure Caspar David Friedrich 1832 Stour Valley John Constable 1840 homework assignment due December 1st 5 PM on line go to course website and follow the link to the 6 homework assignment cultural evidence how reliable is it really e g Medieval warm period and vineyards in England as pointed out by some folks what stuff did these guys drink in the 1300 s what are they growing in England today glacial retreat http en wikipedia org wiki Retreat of glaciers since 1850 Grinnell Glacier Glacier Natl Park 1935 1981 1998 2005 images compiled at http en wikipedia org wiki Retreat of glaciers since 1850 some final thoughts for the week magnitude of absolute changes is important rate of change is important to put it in perspective yes the earth s climate has been warmer yes it also has been a lot cooler the present warming occurs during an interglacial already warm period yes the polar bear survived previous warming events but many other species did not


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