Lecture 19 Intro to Climate Change

Lecture 19 Intro to Climate Change - Lecture 19 Intro to...

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Lecture 19 Intro to Global Change Predicted T increase over next century Note +7ºC increase in polar regions Lecture 19 Intro to Global Change How significant is a 5 ºC shift? 10,000 years ago the climate was 4-10ºC cooler Lecture 19 Intro to Global Change Weather Local short term Climate Regional long term Lecture 19 Intro to Global Change 1 2 3 5 4 Record of Climate Change For the last million years Has it changed??? How and why???? Glacial periods Lecture 19 Intro to Global Change Historical records Geological records Sediment types and landforms Ice core records Isotopes Gas contents Tree rings Global change the evidence: Lecture 19 Intro to Global Change Historical records End 1700s warming 1940-1980 cool 1980 - today temp increase 0.8 o C the warmest period in recorded history Global change the evidence:
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More than just changes in surface air temperature: • Increase in temp of upper atmosphere (+2.5ºC) • Reduction in snow cover in N. Hemisphere
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This note was uploaded on 01/19/2012 for the course EARTH SCIE 1081 taught by Professor Samrussell during the Fall '11 term at UWO.

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Lecture 19 Intro to Climate Change - Lecture 19 Intro to...

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